WO2014126484A1 - Méthode et système d'identification de zones à connectivité de fractures élevée dans un réservoir géologique/géothermique - Google Patents

Méthode et système d'identification de zones à connectivité de fractures élevée dans un réservoir géologique/géothermique Download PDF

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WO2014126484A1
WO2014126484A1 PCT/NZ2014/000017 NZ2014000017W WO2014126484A1 WO 2014126484 A1 WO2014126484 A1 WO 2014126484A1 NZ 2014000017 W NZ2014000017 W NZ 2014000017W WO 2014126484 A1 WO2014126484 A1 WO 2014126484A1
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distribution
zones
radiation
subsurface region
borehole
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Peter LEARY
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Auckland Uniservices Ltd
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Auckland Uniservices Ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells

Definitions

  • the invention comprises a method and system for identifying zones of relative high fracture connectivity in a geothermal reservoir, from well-log data.
  • Well logging is the practice of making a detailed physical/chemical property record of the geologic formations penetrated by a borehole.
  • Well logging is performed in boreholes drilled for oil and gas, groundwater, mineral and geothermal exploration, and environmental and geotechnical studies.
  • Well logs are used to assess depth and thickness of formations, the types formations encountered, the physical and chemical properties of the formations traversed, the presence of oil and/ or gas, and similar.
  • Gamma ray logging is a well logging method in which naturally occurring gamma radiation is measured to characterize the chemical make-up of the rock in a borehole. Different types of rock emit different amounts and different spectra of natural gamma radiation.
  • Three elements and their decay chains are responsible for the radiation emitted by rock: potassium, thorium and uranium.
  • An instrument is lowered down the drill hole and gamma radiation variation with depth recorded.
  • a gamma-ray log may records the total radiation or distinguish the three component decay chains by the energy (measured in MeV or millions of electron volts) of their characteristic gamma emissions.
  • the characteristic gamma ray lines associated with each component are: Potassium - gamma ray energy 1.46 MeV; Thorium series - gamma ray energy 2.62 MeV; and Uranium-Radium series - gamma ray energy 1.76 MeV.
  • Zones of rock where there is increased fracture connectivity may be the productive zones for drilling particularly in geothermal fields where the radioactive elements thorium and uranium are diagnostic of deep-seated fracture-flow connectivity that could be relevant to the geothermal reservoir fracture-flow system.
  • Better knowledge of the fracture-flow structure material aids in siting production and injection wells, thus substantially reducing drilling costs, one of the most important economic factors in producing geothermal energy.
  • the invention comprises a method for identifying zones of relative high fracture connectivity in a geologic formation such as a geothermal reservoir, which comprises comparing well-log data on the distribution of K relative to Th and/ or U and assessing for zones of increased fracture connectivity in the rock from the comparison.
  • the invention comprises a method of drilling in geothermal production which comprises obtaining well log data indicating the distribution of K and Th and/ or U in a geologic formation such as a geothermal reservoir, identifying zones of relative high fracture connectivity by comparing the distribution of K relative to Th and/or U, and operating drilling machinery to drill or access the identified zones of high fracture connectivity in interest of greater well productivity or injectivity.
  • the method includes assessing for zones of increased fracture connectivity by comparing the spatial statistics of radiation intensity from K, Th and/ or U, such as gamma ray emission and by means of the 'population distribution' of well-log spatial fluctuations; in particular, the relevant population distribution statistical identifiers are 'normal' and 'lognormal' ('normal' distributions are the 'bell-shaped curves' with mean value and standard deviation from the mean; 'lognormal' distributions are commonly liiglily skewed towards small values, with a few large values dominating the character of the population; formally, 'lognormal distributions' are distributions in which the logarithm of the quantity in question (here intensity of K, Th, U emissions at successive points along a well trajectory) is normally distributed).
  • the relevant population distribution statistical identifiers are 'normal' and 'lognormal' ('normal' distributions are the 'bell-shaped curves' with mean value and standard deviation from the mean; 'lognormal' distributions are commonly liiglily
  • the method comprises identifying zones of increased fracture connectivity as zones for which the spatial distribution statistics of radiation from K differs from In at least some embodiments the method comprises comparing log-normal distributions of the spatial intensity of and Th and/ or U gamma ray emission.
  • the invention comprises a system for identifying zones of relative high fracture connectivity in a geologic formation such as a geothermal reservoir, comprising memory and a processor arranged to store and compare well log data indicating the distribution of K and Th and/or U in a geothermal reservoir to assess for zones of increased fracture connectivity.
  • system is arranged to assess for zones of increased fracture connectivity by comparing the spatial distribution statistics of radiation from K, Th and/or U. In at least some embodiments the system is arranged to identify zones of increased fracture connectivity as zones for which the spatial distribution statistics of radiation from K differs from
  • system is arranged to compare log-normal distributions of the spatial distribution statistic of K and Th and/ or U.
  • the invention may broadly be said to consist of a method for identifying o zones of relatively high fracture connectivity in a subsurface region comprising the steps of: comparing data indicative of distribution of Potassium (K) with data indicative of distribution of Thorium (Th) and/or Uranium (U) within the subsurface region , and
  • the method further comprises the step of identifying zones of relatively high fracture connectivity when the data indicative of distribution of Potassium (K) differs from data indicative of distribution of Thorium (Th) and/or Uranium (U).
  • K Potassium
  • Th Thorium
  • U Uranium
  • the step of comparing data comprises comparing spatial statistics of radiation from K with spatial statistics of radiation from Th and/ or U within the subsurface region.
  • the step of comparing data comprises comparing distribution(s) of spatial intensity of radiation from K with distribution(s) of spatial intensity of radiation from Th and/ or U within the subsurface region.
  • the step of identifying zones of relatively high fracture connectivity comprises identifying a relatively high number of fluctuations in the distribution of spatial intensity of radiation of Th and/ or U.
  • the method further comprises the step of receiving input data indicative of distribution of K, and input data indicative of distribution(s) of Th and/ or U within the subsurface region.
  • the method comprises receiving input data indicative of spatial intensity of radiation from K and data indicative of spatial intensity of radiation from Th and/or U within the subsurface region.
  • the method further comprises after receiving the input data, determining the distribution of the input data indicative of the distribution of K, and determining the distribution(s) of the input data indicative of the distribution(s) of Th and/or U.
  • the method further comprises detecting intensity of radiation from K at one or more locations witliin the subsurface region to obtain distribution of K within the subsurface region, and detecting intensity of radiation from Th and/or U at one or more locations within the subsurface region to obtain distribution of Th and/ or U witliin the subsurface region.
  • the invention may broadly be said to consist of a system for identifying o zones of relatively high fracture connectivity witliin a subsurface region comprising:
  • a memory component configured to store data relating to distribution of K, and distribution of Th and/or distribution of U within the subsurface region, and
  • a processing component configured to compare the stored data to assess for zones indicative of relatively high fracture connectivity.
  • the processing component is configured to identify zones of relatively high fracture connectivity when the data indicative of distribution of Potassium (K) differs from data indicative of distribution of Thorium (Th) and/ or Uranium (U).
  • K Potassium
  • Th Thorium
  • U Uranium
  • the processing component is configured to compare spatial statistics of radiation from K with spatial statistics of radiation from Th and/ or U within the subsurface region.
  • the processing component is configured to compare distribution(s) of spatial intensity of radiation from K with distribution(s) of spatial intensity of radiation from Th and/ or U witliin the subsurface region.
  • the processing component is configured to identify one or more zones of relatively high fracture connective by identifying a relatively high number of fluctuations in the distribution of spatial intensity of radiation of Th and/ or U.
  • the memory component is configured to store input data indicative of spatial intensity of radiation from K and data indicative of spatial intensity of radiation from Th and/ or U within the subsurface region.
  • the processing component is further configured to determine the distribution of the input data indicative of the distribution of K, and determine the distribution(s) of the input data indicative of die distribution(s) of Th and/or U.
  • the system further comprises one or more devices configured to detect intensity of radiation from K at one or more locations within the subsurface region to obtain distribution of K within the subsurface region, and detect intensity of radiation from Th and/ or U at one or more locations within the subsurface region to obtain distribution of Th and/ or U within the subsurface region.
  • the invention may broadly be said to consist of a method for drilling a borehole in a subsurface region comprising the steps of:
  • the step of drilling comprises operating machinery to drill the borehole.
  • the method further comprises prior to drilling, deterirrining, from the zones of relatively high fracture connectivity, a location and/or a pathway for drilling a borehole that maximises extraction of natural resource via the borehole.
  • the invention may broadly be said to consist of a system for drilling a borehole in a subsurface region comprising:
  • drilling machinery operable to drill a borehole based on the identified zone(s) of relatively high fracture connectivity.
  • the drilling machinery is communicatively coupled to the system for identifying zones of high fracture connectivity.
  • the system further comprises at least one processing component configured to process data indicative of relatively high fracture connectivity to determine a location and/ or a pathway for drilling a borehole to maximise extraction of natural resource via the borehole.
  • the processing component is further configured to operate the drilling machinery in accordance with the determined borehole location and/ or pathway.
  • the invention may broadly be said to consist of a method for extraction of one or more natural resource from a subsurface region comprising the steps of:
  • the method further comprises prior to extracting, injecting fluid into the borehole to cause fracturing adjacent the borehole.
  • the one or more natural resources include any one or more of a natural gas, oil or hot water.
  • the invention may broadly be said to consist of a system for extraction of one or more natural resources from a subsurface region comprising:
  • a drilling system as defined above for drilling a borehole in the subsurface region, and an extraction system for extracting one or more natural resources through the borehole.
  • the system further comprises a fluid injection system for injecting fluid into the borehole to cause fracturing the subsurface region adjacent the borehole.
  • the one or more natural resources include any one or more of a natural gas, oil or hot water.
  • the invention may broadly be said to consist of a method for assessing a geologic formation which comprises comparing well-log data on the distribution of K relative to Th and/or U and assessing for zones of increased or relatively high non-cohesiveness providing permeability for fluid movement in the formation from the comparison.
  • the method further comprises the step of identifying zones of increased or relatively high non-cohesiveness when the data indicative of distribution of Potassium (K) differs from data indicative of distribution of Thorium (Th) and/or Uranium (U).
  • the step of comparing data comprises comparing distribution of spatial intensity of radiation from K with distribution of spatial intensity of radiation from Th and/ or U within the geologic formation.
  • the invention may broadly be said to consist of a system for assessing a geologic formation comprising:
  • a memory component configured to store data relating to distribution of K, and distribution of Th and/ or distribution of U within the geologic formation
  • a processing component configured to compare the stored data to assess for zones of increased or relatively high non-cohesiveness providing permeability for fluid movement in the formation from the comparison.
  • the processing component is configured to assess for zones of increased or relatively high non-cohesiveness when the data indicative of distribution of Potassium (K) differs from data indicative of distribution of Thorium (Th) and/ or Uranium (U).
  • K Potassium
  • Th Thorium
  • U Uranium
  • the processing component is configured to compare distribution of spatial intensity of radiation from K with distribution(s) of spatial intensity of radiation from Th and/ or U within the geologic formation.
  • the invention may broadly be said to consist of a method for generating data defining zones for resource extraction dependent on relating the variance of spatial frequency distributions of radiation in energy bands characteristic of two or more of K, Th, U.
  • the invention may broadly be said to consist of a system for for generating data defining zones for resource extraction dependent on relating the variance of spatial frequency distributions of radiation in energy bands characteristic of two or more of K, Th, U.
  • a fracture In a geological formation such as rock a fracture is any local separation or discontinuity plane such as a joint or a fault that divides the rock into two or more pieces. A fracture will sometimes form a deep fissure or crevice in the rock. Fractures are commonly caused by tectonics-induced tensile stress exceeding the rock strength, causing the rock to lose cohesion along its weakest plane. Fractures can provide permeability for fluid movement, such as water or hydrocarbons. Highly fractured rocks can make good aquifers or hydrocarbon reservoirs, since they may possess both significant permeability and fracture porosity. In the method and system of the invention zones of increased fracture connectivity are identified by a comparison of the spatial intensity distribution statistics of radiation from K and Th and/or U isotopes.
  • Potassium isotope can either be in solution or locked into minerals— and usually a combination of both if a fracture system is present in a zone within a field.
  • Thorium and Uranium isotopes tend to be in solution and transported into place from source zones deeper in the crust. Isotopes in solution tend to collect in fractures and the distribution of spatial intensity variations tends to conform to that observed for connected fracture systems.
  • a log-normal distribution of the spatial frequency that is skewed for transported elements Th and U compared to the other elements less subject to transport in solution gives information on the presence of connected fracture systems.
  • the invention may be useful in relation to drilling in geothermal reservoirs.
  • fracture connectivity includes both any separation or discontinuity or non-cohesiveness that divides previously cohesive in a geological formation such as rock, caused by tectonics-induced tensile stress exceeding the rock strength for example, creating permeability and/or porosity, and also naturally occurring permeability and/or porosity or non-cohesiveness through rock, occurring at a grain scale for example in the rock or other geological formation, and "fracture” has a similar meaning.
  • the term “comprising” as used in this specification means “consisting at least in part of. When interpreting each statement in this specification that includes the term “comprising”, features other than that or those prefaced by the term may also be present. Related terms such as “comprise” and “comprises” are to be interpreted in the same manner. BRIEF DESCRIPTION OF THE FIGURES
  • Figure 1 is a block a block diagram of a system for identifying zones of relatively high fracture connectivity in a subsurface region in accordance with a preferred embodiment of the invention
  • Figure 2 is a process flow diagram showing a process 200 of identifying or predicting zones of relatively high fracture connectivity in accordance with a preferred embodiment of the inveiton
  • Figure 3 is a process flow diagram showing the process of analysing the well log data to determine fracture connectivity or zone of high fracture connectivity of figure 2
  • Figure 4 is a process flow diagram showing a method 300 for drilling a borehole in a subsurface region in accordance with a preferred embodiment of the invention
  • Figures 6 and 10 are well-log fluctuation histograms for two wells - with data normalised to zero- mean/unit-variance (K at the top, Th at the middle and U at the bottom);
  • Figures 7 and 11 are y/K/Th/U well-logs for the two wells.
  • Figures 8 and 12 show y/K/Th/U well-log spectra determined from the well-logs of figures 7 and 11 respectively - power-law exponent at top of plots.
  • the invention comprises a method and system for identifying zones of relative high fracture connectivity (as herein defined) in typically a geothermal reservoir.
  • 'Geothermal reservoir' refers to rock/ geological/ crustal volume through which economically valuable quantities of hot water flow; managing the reservoir hot water flow requires knowing where in the crustal volume most water flows; in many geological contexts flow structure can refer to specific 'formations' but in most currently produced geothermal reservoirs, flow occurs in fracture systems rather than in formations, hence the need to investigate fracture system flow structure.
  • Fracture-system flow structure being a very tricky proposition, using well-log data as described herein stands to be a useful fracture-system flow-structure diagnostic.
  • the embodiments may be described as a process that is depicted as a flowchart, a flow diagram, a structure diagram, or a block diagram. Although a flowchart may describe the operations as a sequential process, many of the operations can be performed in parallel or concurrently. In addition, the order of the operations may be rearranged.
  • a process is terminated when its operations are completed.
  • a process may correspond to a method, a function, a procedure, a subroutine, a subprogram, etc., in a computer program. When a process corresponds to a function, its termination corresponds to a return of the function to the calling function or a main function.
  • aspects of the systems and methods described below may be operable on any type of general purpose computer system or computing device, including, but not limited to, a desktop, laptop, notebook, tablet or mobile device.
  • the system 100 includes a data gathering source 110 configured to obtain geological data indicative of one or more parameters associated with the reservoir, a memory component 120 configured to store information relating to the gathered data and/ or relating to the methodology for determining a level of fracture connectivity (such as mathematical equations), and a processing component 130 configured to process the data gathered by the data gathering source 110 in accordance with the information stored in the memory component 120 to identify zones of relatively high fracture connectivity 180.
  • a data gathering source 110 configured to obtain geological data indicative of one or more parameters associated with the reservoir
  • a memory component 120 configured to store information relating to the gathered data and/ or relating to the methodology for determining a level of fracture connectivity (such as mathematical equations)
  • a processing component 130 configured to process the data gathered by the data gathering source 110 in accordance with the information stored in the memory component 120 to identify zones of relatively high fracture connectivity 180.
  • the processing component 130 is configured to output data relating to the identified zones of relatively high fracture connectivity to an output interface 140 for communicating the output data to a user and/ or machine to help the user and/or machine make decisions regarding a drilling, injection and/or extraction operation associated with the reservoir and/ or to help the user and/ or machine to operate drilling, injection and/or extraction equipment/machinery accordingly.
  • the machine or user may operate a drilling apparatus 150 to drill a borehole 190 based on zones of relatively high fracture connectivity 180.
  • the output data relating to the identified zones of relatively high fracture connectivity may represent a fracture connectivity profile for a predefined region within the reservoir.
  • the various components of the system 100 may be communicatively coupled directly to one another and/ or via a communications network 160.
  • Particular location of zones of high fracture connectivity may be determined and defined based on a two dimensional or a three-dimensional coordinate system, preferably the latter.
  • a process flow diagram showing a process 200 of identifying or predicting zones of relatively high fracture connectivity is shown.
  • data is gathered from one or more sources for one or more parameters associated with a particular region of the reservoir.
  • the one or more parameters include the presence or distribution of Potassium (DC) and Thorium (Th) and/ or Uranium (U) in the geologic formation.
  • the data indicative of such parameters may include or may be generated from any combination of: the presence and/or concentration of K and Th and/or U, and/or the location(s) of K and Th and/or U in the reservoir, and/ or any other aspect relating to the spatial distribution of these elements.
  • Well log data is obtained indicating the distribution of K and Th and/ or U in a geologic formation.
  • the data typically comprises a spectral analysis from which K and Th and/or U may be distinguished by the energy of their characteristic gamma emissions.
  • the data indicates the spatial frequency of radiation from K, Th and/or U.
  • the sources for obtaining the input data may include any combination of: radiation detector (s)/receiver(s) and in the preferred embodiment gamma radiation detector(s)/receiver(s).
  • the input data is processed and analysed by the system processor 130 to determine fracture connectivity within the region of the reservoir and/ or to identify zones of high fracture connectivity within that region.
  • the processor 130 is configured to generate and analyse spatial statistics of the input data indicative for K and Th and/or U. Spatial statistics ('data' and 'statistics' are used similarly in this specification) of radiation and in preferred embodiments distributions of the spatial distribution statistics of radiation from K and Th and/ or U are analysed to assess for zones of increased fracture connectivity in the rock. Zones of relative high fracture connectivity are identified as zones in which the spatial distribution statistics of radiation from K differs from that of Th and/ or U.
  • K isotope can either be in solution or locked into minerals or both if a fracture system is present in a zone within a field while Th and U isotopes tend to be in solution, and a distribution of the spatial frequency that is skewed for Th and U (log-normal) compared to the other isotopes gives information on the presence of connected fracture systems.
  • Figure 3 is a process flow diagram showing the process 210 of analysing the well log data to determine fracture connectivity or zone of high fracture connectivity.
  • the distributions of the spatial statistics of radiation from K and Th and/or U are determined.
  • the distribution of K is compared with the distribution of Th and/ or U.
  • the distribution of spatial intensity of K is compared to the distribution(s) of spatial intensity of Th and/or U.
  • the zones where the distribution(s) of Th and/ or U differs from the distribution of K are identified and stored as zones of increased/high fracture connectivity.
  • the zones of increased/high fracture connectivity are output to a machine or user via the output interface 140.
  • a machine and/or user can utilise information relating to fracture connectivity to make decisions regarding optimal borehole drilling location and/ or drilling paths in a reservoir for improving yield of extraction of a natural resource from the borehole.
  • the data may be utilised by a machine and/ or user to predict or determine performance or productivity of natural resource extraction within the subsurface region.
  • Figure 4 is a process flow diagram showing a method 300 for drilling a borehole in a subsurface region, such as a geological or geothermal reservoir according to the preferred embodiments described above.
  • the method 300 may be extended to a method of extraction or production of a natural resource, such as a natural gas, oil or hot water, located within the subsurface region in accordance with the preferred embodiments described above.
  • the method of drilling and/or the method of extraction/production is/are facilitated through the identification of zones of high fracture connectivity and/ or the prediction of fracture connectivity profile(s) within the subsurface region in accordance with the embodiments described above.
  • zones of high fracture connectivity are predicted/determined for the subsurface region in accordance with the steps of method 200 described above.
  • the fracture connectivity may be due to division of previously cohesive rock due to tectonics-induced tensile stress for example, creating permeability and/or porosity, or naturally occurring permeability and/or porosity or non-cohesiveness through rock, occurring at a grain scale in the rock for example.
  • a machine or machines coupled to the output interface 140 receive the output data indicative of zones of high fracture connectivity and/ or one or more fracture connectivity profile and process the data to determine any one or more optimal locations and/ or paths for drilling a borehole in the subsurface region.
  • the data for example may be processed to determine the location and/or pathway(s) that traverse(s) through or adjacent the highest number of high fracture connectivity zones for a given length.
  • the data may be processed based on any one or more algorithms that receive, as in input, the output data relating to zones of high fracture connectivity and/or one or more fracture connectivity profile, and predict(s) from this input the borehole location and/or pathway(s) that produces any one or more of: maximum or improved yield of extraction, maximum or improved extraction rate and/ or maximum or improved well performance/productivity.
  • the output data is received by one or more operators, geologists, engineers or the like to determine course of action to take to enhance natural resource productivity from the subsurface region.
  • the person or persons may manually process the data to determine or predict any one or more optimal locations and/or paths for drilling a borehole in die subsurface region, or may enter the data into a processing device configured to determine or predict the same.
  • the method of determining or predicting any one or more optimal locations and/ or paths, whether conducted manually by the person(s) or via the processing device may be based on any one or more algorithms as described above for the fully automated process.
  • a borehole is drilled into the subsurface region in accordance with the determined or predicted location and/or path(s).
  • Either the operator, or any one of the processing devices used to predict or determine the drilling location(s) or path(s) may operate one or more drilling machinery to form one or more injection and/or extraction boreholes accordingly.
  • the method 300 may be extended to a method of extraction or production of a natural resource, such as a natural gas, oil or hot water, located within the subsurface region in accordance with the preferred embodiments described above.
  • a natural resource such as a natural gas, oil or hot water
  • an injection borehole may be formed also based on zones of increased fracture connectivity.
  • an injection system or machine may inject water and or other fluids into the injection borehole to heat up the water or fluid before extraction. Injection of water and/or fluid may also enhance or cause fracturing at or near the borehole to further improve well performance and/or yield of extraction.
  • an extraction machine is used to extract the natural resource such as gas, oil, water and/ or mineral(s) from the reservoir in that region through the extraction borehole.
  • zones of increased/high fracture connectivity are determined dependent on relating the variance of spatial frequency distributions of radiation in energy bands characteristic of two or more of K, Th, U.
  • the invention may be encompassed by a method and/ or system for generating data defining zones for resource extraction dependent on relating the variance of spatial frequency distributions of radiation in energy bands characteristic of two or more of K, Th, U.
  • Th, U we would expect the majority of K to be normally distributed (reservoir) and the majority of Th and U to be lognormally distributed (fracture percolation flow). This is observed for both wells.
  • Well 47D shows a bonus population signal in that well K is clearly bimodally distributed, with its large normal population related to the reservoir flanked by a small lognormally distributed population related to transport.
  • Well 01D has a possible smaller and more integrated bimodal expression.
  • the K/Th/U spatial snapshot of in situ flow distribution given by 01D/47D well-log data has the potential of turning into either or both conceptual or practical flow models for geothermal systems.
  • Embodiments may be implemented by hardware, software, firmware, middleware, microcode, or any combination thereof.
  • the methods or algorithms described in connection with the examples disclosed herein may be embodied directly in hardware, in a software module executable by a processor, or in a combination of both, in the form of processing unit, programming instructions, or other directions, and may be contained in a single device or distributed across multiple devices.
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD- ROM, or any other form of storage medium known in the art.
  • a storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor.
  • a storage medium may represent one or more devices for storing data, including read-only memory (ROM), random access memory (RAM), magnetic disk storage mediums, optical storage mediums, flash memory devices and/or other machine readable mediums for storing information.
  • ROM read-only memory
  • RAM random access memory
  • magnetic disk storage mediums magnetic disk storage mediums
  • optical storage mediums flash memory devices and/or other machine readable mediums for storing information.
  • machine readable medium and “computer readable medium” include, but are not limited to portable or fixed storage devices, optical storage devices, and/ or various other mediums capable of storing, containing or carrying instruction(s) and/or data.
  • the various illustrative logical blocks, modules, circuits, elements, and/or components described in connection with the examples disclosed herein may be implemented or performed with any combination of one or more of the following implementation mediums: general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic component, discrete gate or transistor logic, discrete hardware components, designed to perform the one or more functions described herein.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the implementation mediums may be communicatively coupled either directly or via any suitable communications network as is well known in the arts of electrical and software engineering.
  • a general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, circuit, and/or state machine.
  • a processor may also be implemented as a combination of computing components, e.g., a combination of a DSP and a microprocessor, a number of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • One or more of the components and functions illustrated the figures may be rearranged and/or combined into a single component or embodied in several components without departing from the invention. Additional elements or components may also be added without departing from the invention.
  • the invention can be embodied in a computer-implemented process, a machine (such as an electronic device, or a general purpose computer or other device that provides a platform on wliich computer programs can be executed), processes performed by these machines, or an article of manufacture.
  • a machine such as an electronic device, or a general purpose computer or other device that provides a platform on wliich computer programs can be executed
  • Such articles can include a computer program product or digital information product in wliich a computer readable storage medium containing computer program instructions or computer readable data stored thereon, and processes and machines that create and use these articles of manufacture.

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Abstract

L'invention concerne une méthode et un système d'identification de zones à connectivité de fractures relativement élevée dans une formation géologique telle qu'un réservoir géothermique ou une autre région souterraine, qui consiste à comparer des données de diagraphie sur la distribution de K par rapport à Th et/ou U et évaluer l'emplacement de zones à connectivité de fractures augmentée dans la roche grâce à la comparaison. La distribution des statistiques spatiales de K est comparée à la distribution des statistiques spatiales de Th et/ou U pour déterminer des zones à connectivité/perméabilité de fractures relativement élevée. De telles informations peuvent être utilisées dans une opération de forage pour améliorer la performance des puits d'extraction.
PCT/NZ2014/000017 2013-02-18 2014-02-18 Méthode et système d'identification de zones à connectivité de fractures élevée dans un réservoir géologique/géothermique Ceased WO2014126484A1 (fr)

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NZ60726513 2013-02-18
NZ607265 2013-02-18

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US11727176B2 (en) 2016-11-29 2023-08-15 Conocophillips Company Methods for shut-in pressure escalation analysis
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WO2025136911A1 (fr) * 2023-12-20 2025-06-26 Schlumberger Technology Corporation Utilisation d'une diagraphie par câble pour évaluer des propriétés de roche et des fractures dans des puits géothermiques

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