CA3011167C - Prediction apparatus and method of predicting desorbed gas volume of shale gas reservoir using geophysical logging data analysis - Google Patents
Prediction apparatus and method of predicting desorbed gas volume of shale gas reservoir using geophysical logging data analysis Download PDFInfo
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- CA3011167C CA3011167C CA3011167A CA3011167A CA3011167C CA 3011167 C CA3011167 C CA 3011167C CA 3011167 A CA3011167 A CA 3011167A CA 3011167 A CA3011167 A CA 3011167A CA 3011167 C CA3011167 C CA 3011167C
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
- G01N23/207—Diffractometry using detectors, e.g. using a probe in a central position and one or more displaceable detectors in circumferential positions
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
Abstract
The present invention relates to an apparatus for predicting the amount of desorption gas in a shale gas layer through geophysical well logging data analysis and a method therefor, the apparatus allowing the amount of desorption gas in the shale gas layer to be predicted. The apparatus for predicting the amount of the desorption gas in the shale gas layer, comprises: a mineral and organic matter amount analysis part for analyzing the amounts of minerals and organic matters by means of thermal analysis on a shale sample collected from a borehole; a canister gas volume measurement part for measuring a gas amount by using gas inside a canister having the collected shale sample sealed therein; a correlation analysis part for extracting, as a main adsorption mineral, minerals having high correlation with the minerals with respect to the gas amount; a main adsorption mineral amount deriving part for deriving the amount of the main adsorption mineral; and a desorption gas amount prediction part for predicting the amount of the gas adsorbed onto a shale gas reservoir layer, by using the derived amount of the main adsorption mineral and the correlation.
Description
DESCRIPTION
PREDICTION APPARATUS AND METHOD OF PREDICTING DESORBED GAS
VOLUME OF SHALE GAS RESERVOIR USING GEOPHYSICAL LOGGING DATA
ANALYSIS
Technical Field [0001) The present invention relates to a prediction apparatus and a method of predicting a desorbed gas volume of a shale gas reservoir. More particularly, the present invention relates to a prediction apparatus and a method of predicting a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis which enables the desorbed gas volume of the shale gas reservoir to be predicted by: deriving a correlation of a geophysical logging data analysis result by mineral and a measured canister gas volume value; selecting major minerals having correlationship exceeding preset reference values; and using correlation of derived major mineral contents and the measured canister gas volume value after deriving the selected major mineral contents.
Background Art
PREDICTION APPARATUS AND METHOD OF PREDICTING DESORBED GAS
VOLUME OF SHALE GAS RESERVOIR USING GEOPHYSICAL LOGGING DATA
ANALYSIS
Technical Field [0001) The present invention relates to a prediction apparatus and a method of predicting a desorbed gas volume of a shale gas reservoir. More particularly, the present invention relates to a prediction apparatus and a method of predicting a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis which enables the desorbed gas volume of the shale gas reservoir to be predicted by: deriving a correlation of a geophysical logging data analysis result by mineral and a measured canister gas volume value; selecting major minerals having correlationship exceeding preset reference values; and using correlation of derived major mineral contents and the measured canister gas volume value after deriving the selected major mineral contents.
Background Art
[0002] A traditional gas is moved and trapped in reservoir rocks having high porosity and permeability after having been generated from organic matter inside a source rock. For shale gas, remaining gases are trapped by being adsorbed to organic porosities inside a source rock, after gases having been formed from organic matter inside the source rock move to reservoir rocks. Since shale gas is trapped in hale having low permeability, the gas is produced by hydraulic fracturing after horizontal boring along a shale gas reservoir including a large volume of gas, which is different from a traditional gas production method.
W Accordingly, selection of a shale gas reservoir having a large volume of gas is necessary for success of a shale gas operation.
W Accordingly, selection of a shale gas reservoir having a large volume of gas is necessary for success of a shale gas operation.
[0003] In addition, shale gas is distributed in very tight shale differently from traditional gas resources, and shows a feature that characteristics of rock physics and geochemistry inside a reservoir ,are heterogeneous.
Accordingly, for effective and sustainable production of shale gas, characteristics analysis of rock physics and geochemistry inside a reservoir are important. Particularly, gas produced from a shale gas reservoir is originated from a free gas being confined in porosities or cracks inside a rock and a desorbed gas adsorbed on organic matter surfaces.
Meanwhile, an assessment for a case of the free gas may be performed by a traditional method, whereas a standardized assessment technique for a case of the desorbed gas is not available yet.
Disclosure Technical Problem
Accordingly, for effective and sustainable production of shale gas, characteristics analysis of rock physics and geochemistry inside a reservoir are important. Particularly, gas produced from a shale gas reservoir is originated from a free gas being confined in porosities or cracks inside a rock and a desorbed gas adsorbed on organic matter surfaces.
Meanwhile, an assessment for a case of the free gas may be performed by a traditional method, whereas a standardized assessment technique for a case of the desorbed gas is not available yet.
Disclosure Technical Problem
[0004] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to resolve conventional problems described as above and to provide a W prediction apparatus and method of a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis which enables the desorbed gas volume of the shale gas reservoir to be rapidly and accurately predicted and an effective and sustainable production of shale gas to be Is possible: by selecting minerals having a high correlation as major adsorption minerals as major adsorption factors through an interaction formula using a correlation of mineral and organic matter contents analyzed from a boring core of a reservoir and a canister gas volume; and by 20 allowing the desorbed gas volume distributed inside the shale gas reservoir to be predicted by using the correlation after deriving selected major mineral contents.
Technical Solution
Technical Solution
[0005] In order to accomplish the above object, the present invention provides a prediction apparatus of a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis, and the prediction apparatus is configured to include:
[0006] a mineral and organic matter content analysis part analyzing mineral and organic matter contents by thermal analysis of a shale sample collected from a borehole;
[0007] a canister gas volume measurement part measuring gas contents by using a gas inside a canister sealing a collected shale sample;
[0008] a correlation analysis part extracting minerals having a correlation exceeding a preset reference value as major adsorption minerals by analyzing a correlation of the minerals and the gas contents;
[0009] a major adsorption mineral content derivation part deriving contents of the major adsorption minerals being extracted; and
[0010] a desorbed gas volume prediction part predicting contents of a gas adsorbed in a shale gas reservoir by using an interaction formula of derived contents of the major adsorption minerals and the correlation.
[0011]
[0012] The mineral and organic matter content analysis part may be configured to analyze TOO of organic matter and constituent and contents of minerals through XRD analysis.
[0013]
[0014] The mineral and organic matter content analysis part may be configured to perform analyses of logging data by natural gamma radiation, neutron porosity, density, electrical resistivity, and sonic logging.
[0015]
W [0016] The mineral and organic matter content analysis part may be configured to calculate a volume of shale by using a gamma-ray logging and a combination of neutron porosity and density logging.
[0017]
[0018] After classifying collected samples into the major adsorption minerals and remainders excluding the major adsorption minerals as a clay mineral, the contents of the major adsorption minerals are derived by the formula:
VSh = psh¨ Iiish = pclays Tinain=
pmain¨ pciays , where Vmain is a volume of the major adsorption minerals, pmain a density of the major adsorption minerals, pclays a density of the clay mineral, Vsh a volume of the shale, and psh a density of the shale.
[0019]
[0020] In order to accomplish the above object, the present invention provides a method of predicting a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis, and the method is configured to include:
[0021] performing a mineral and organic matter content analysis analyzing mineral and organic matter contents by thermal analysis on a shale sample collected from a borehole by the mineral and organic matter content analysis part;
[0022] performing a canister gas volume measurement measuring gas contents by using a gas inside a canister sealing a collected sample by the canister gas volume measurement measuring gas contents part;
[0023] performing a correlation analysis extracting minerals having a correlation exceeding preset reference value as major adsorption minerals by analyzing a correlation of the minerals and the gas contents by the correlation analysis part;
[0024] performing a major adsorption mineral content derivation deriving contents of the major adsorption minerals being extracted by the major adsorption mineral content derivation part; and [0025] performing a desorbed gas volume prediction predicting contents of a gas adsorbed in a shale gas reservoir by using derived contents of the major adsorption minerals and the correlation by the desorbed gas volume prediction part.
[0026]
[0027] The performing mineral and organic matter content analysis may be a process of analyzing TOO of an organic matter and constituent and contents of minerals through XRD
analysis.
[0028]
[0029] The performing mineral and organic matter content analysis may further include a process of performing analyses of logging data by natural gamma radiation, neutron porosity, density, electrical resistivity, and sonic logging.
[0030]
[0031] The performing mineral and organic matter content analysis may further include a process of calculating a volume of shale by using gamma-ray logging and a combination of neutron porosity and density logging.
[0032]
[0033] After classifying the collected samples into the major adsorption minerals and remainders excluding the major adsorption minerals as a clay mineral, the major adsorption minerals are derived by the following formula:
= VSh psh¨ Vsh pdays timain [0034] pain¨ Mays , where Vmain is a volume of the major adsorption minerals, pmain a density of the major adsorption minerals, pclays a density of the clay mineral, Vsh a volume of the shale, and psh a density of the shale.
Advantageous Effects [0035] As described above, the present invention provides an effect which enables the desorbed gas volume of a shale gas reservoir to be rapidly and accurately predicted and an effective and sustainable production of shale gas to be possible: by selecting minerals having high correlation as major adsorption minerals as major adsorption factors through an interaction formula using a correlation of mineral and organic matter contents analyzed from a boring core of a reservoir and a canister gas volume; and by allowing the desorbed gas volume distributed inside the shale gas reservoir to be predicted by using the correlation after deriving selected major mineral contents.
Description of Drawings [0036] FIG. 1 is a block diagram of a prediction apparatus 1 of a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis according to an embodiment of the present invention.
[0037] FIG. 2 is a flow chart showing a process of a prediction method of the desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis of the present invention.
[0038] FIG. 3 depicts graphs each showing a correlation of one of a combination of minerals inside a collected sample and a canister gas volume.
Mode for Invention [0039] In describing the present invention, detailed descriptions of prior arts and constituents which have been deemed to obfuscate the gist of the present invention will be omitted below.
[0040]
[0041] Since embodiments according to a concept of the present invention may be modified in various ways and have many types, specific embodiments will be illustrated in drawings and described in detail in the present description or application. However, it is to be understood that the embodiments according to the concept of the present invention are not limited to a specific disclosure, but, on the contrary, are intended to cover all kinds of modifications, equivalent arrangements or substitutes included within the spirit and technical scope of the present invention. In addition, a term "exemplary" is used to mean "as an example", "for example", or "plays a role as an illustration". Any aspects described with "exemplary" in this description should not be necessarily interpreted as they must be preferable to or advantageous than other aspects.
[0042]
[0043] When a constituent is referred to as being W "connected" or "joined" to another constituent, this should be understood that the constituent may be directly connected or joined to the other constituent, but a different constituent may be interposed therebetween. In contrast, when a constituent is referred to as being "directly connected" or "directly joined" to another constituent, this should be understood that no different constituent is interposed therebetween. Other expressions to explain relationship between other constituents such as "between"
and "just between" or "adjacent to" and "directly adjacent to" should be understood in the same way.
[0044] Terms used in the present specification are used to describe only specific embodiment and are not intended to limit the present disclosure. An expression in a singular form includes an expression in a plural form, unless the meaning is not obviously different conextually. It should be understood that terms such as "include" or "have" in the present disclosure are intended to designate the existence of a character, a numeral, a step, a movement, a constituent, a parts, or a combination of these which are embodied, and not to exclude at least one of other character, numeral, step, movement, constituent, parts, or combination of these, or an additional possibility.
[0045]
[0046] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings illustrating embodiments of the present invention.
[0047] Embodiments of the present invention predicted a desorbed gas volume inside shale by deriving major adsorption minerals by analyzing a correlation of mineral 0 and organic matter (TOC) contents analyzed from a boring core of the Montney Shale Gas Reservoir and a canister gas volume, and by deriving an interaction formula extracting contents of major adsorption minerals.
[0048]
[0049] FIG. 1 is a block diagram of a prediction apparatus 1 of a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis according to an embodiment of the present invention.
[0050] As illustrated in FIG. 1, the prediction apparatus 1 of the desorbed gas volume of the shale gas reservoir is configured to include: a mineral and organic matter content analysis part 10, a canister gas volume measurement part 20, a correlation analysis part 30, a major adsorption mineral content derivation part 40, and a desorbed gas volume prediction part 50.
[0051] The mineral and organic matter content analysis part 10 is configured to analyze mineral and organic matter contents by thermal analysis on a shale sample collected from a borehole.
Specifically, the mineral and organic matter content analysis part 10 is confjgured to analyze TOO
and kinds and contents of minerals through XRD analysis, natural gamma radiation, neutron porosity, density, electrical resistivity, and sonic logging. In addition, a volume of shale is configured to be calculated by using gamma-ray logging and a combination of neutron porosity and density logging.
[0052] The canister gas volume measurement part 20 is configured to measure gas contents by using a gas inside a canister sealing a collected shale sample.
[0053] The correlation analysis part 30 is configured to perform correlation analysis extracting minerals having high correlation (exceeding preset reference value) as major adsorption minerals having large gas adsorption volume by analyzing correlation of the mineral and gas contents.
[0054] The major adsorption mineral content derivation part 40 is configured to derive contents of the major adsorption minerals being extracted. In other words, after classifying the collected samples into major adsorption minerals and remainders excluding major adsorption minerals as a clay mineral, the contents of the major adsorption minerals are derived by the formula:
TT TirS h # psh¨ fish pelays main ¨
pmcall pc lays , where Vmain is a volume of the major adsorption minerals, pmain a density of the major adsorption minerals, pclays a density of the clay mineral, Vsh a volume of the shale, and psh a density of the shale.
[0055] The desorbed gas volume prediction part 50 is configured to predict contents of a gas adsorbed in a shale gas reservoir by inversely applying the interaction formula of derived contents of the major adsorption minerals and the correlation.
[0056]
[0057] FIG. 2 is a flow chart showing a process of a prediction method of a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis of the present invention.
[0058] As illustrated in FIG. 2, the prediction method of the desorbed gas volume of the shale gas reservoir is configured to include: a mineral and organic matter content analysis step S10, a canister gas volume measurement step S20, a correlation analysis step S30, a major adsorption mineral content derivation step S40, and a desorbed gas volume prediction step S50.
[0059] The mineral and organic matter content analysis step S10 is a process of analyzing minerals and organic matter by thermal analysis on a shale sample collected from a borehole by the mineral and organic matter content analysis part 10. In this process, TOC and kinds and contents of minerals are analyzed through XRD analysis, natural gamma radiation, neutron porosity, density, electrical resistivity, and sonic logging. In addition, the volume of shale is calculated by using gamma-ray logging and a combination of neutron porosity and density logging.
[0060] The canister gas volume measurement step S20 is a process of measuring gas contents by using a gas inside a canister sealing a collected sample by the canister gas volume measurement part 20.
[0061] The correlation analysis step S30 is a process wherein a correlation of the mineral and gas contents is analyzed by the correlation analysis pert 30, and minerals having high correlation are extracted as major adsorption minerals having a large adsorbed gas volume.
[0062] FIG. 3 depicts graphs each showing a correlation of one of a combination of minerals inside a collected sample and a canister gas volume.
[0063] As illustrated in FIG. 3, correlation of canister volume and various combinations of minerals are derived in the correlation analysis step S30 by the correlation analysis part 30, that is, correlations of canister volume to a clay mineral, canister volume to illite/mica and smectite, canister volume to illite/mica, canister volume to illite/smectite, canister volume to kaolinite, canister volume to chlorite, and so on.
[0064] In the case of FIG. 3, the desorbed gas content and correlation for each combination of minerals are as follows.
[0065] 8.966 + 0.743*Volume of Clay minerals R2= 0.442 [0066] 7.748 + 0.971*Volume of Illite/Smectite/Mica R2=
0.537 [0067] 6.317 + 8.534*Volume of Illite/Smectite R2= 0.682 [0068] 8.150 + 1.079*Volume of Illite/Mica R2= 0.510 [0069] 19.47 + 0.982*Volume of Chlorite R2-= 0.034 [0070] 20.90 + 7.996*Volume of Kaolinite R2= 0.442 [0071]
[0072] In the case of FIG. 3, as a result of correlation analysis, the illite was identified as having the largest desorbed gas volume and correlation.
[00731 [0074] With reference to FIG. 2 again, after deriving major adsorption minerals having large desorbed gas content and correlation by performing the correlation analysis step S30 as described above, contents of the major adsorption minerals are derived by the major adsorption mineral content derivation step S40. At this time, to derive a content of the illite of a major adsorption mineral, a collected sample is classified into the illite of the major adsorption mineral W and remainders excluding the illite as a clay mineral. Then, after substituting major adsorption minerals with the illite, the content of the illite is derived by a following interaction formula.
Villite Vsh = psh-Vvh = pclays pillite-pclays [0075] , where Villite is a volume of the illite as the major adsorption mineral, pillite a density of the illite, pclays a density of the clay mineral, Vsh a volume of shale, and psh a density of shale.
[0076]
Subsequently, the desorbed gas volume in the shale gas reservoir in an investigating area is predicted by inversely applying correlation of each of a combination of minerals and the desorbed gas volume in the desorbed gas
W [0016] The mineral and organic matter content analysis part may be configured to calculate a volume of shale by using a gamma-ray logging and a combination of neutron porosity and density logging.
[0017]
[0018] After classifying collected samples into the major adsorption minerals and remainders excluding the major adsorption minerals as a clay mineral, the contents of the major adsorption minerals are derived by the formula:
VSh = psh¨ Iiish = pclays Tinain=
pmain¨ pciays , where Vmain is a volume of the major adsorption minerals, pmain a density of the major adsorption minerals, pclays a density of the clay mineral, Vsh a volume of the shale, and psh a density of the shale.
[0019]
[0020] In order to accomplish the above object, the present invention provides a method of predicting a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis, and the method is configured to include:
[0021] performing a mineral and organic matter content analysis analyzing mineral and organic matter contents by thermal analysis on a shale sample collected from a borehole by the mineral and organic matter content analysis part;
[0022] performing a canister gas volume measurement measuring gas contents by using a gas inside a canister sealing a collected sample by the canister gas volume measurement measuring gas contents part;
[0023] performing a correlation analysis extracting minerals having a correlation exceeding preset reference value as major adsorption minerals by analyzing a correlation of the minerals and the gas contents by the correlation analysis part;
[0024] performing a major adsorption mineral content derivation deriving contents of the major adsorption minerals being extracted by the major adsorption mineral content derivation part; and [0025] performing a desorbed gas volume prediction predicting contents of a gas adsorbed in a shale gas reservoir by using derived contents of the major adsorption minerals and the correlation by the desorbed gas volume prediction part.
[0026]
[0027] The performing mineral and organic matter content analysis may be a process of analyzing TOO of an organic matter and constituent and contents of minerals through XRD
analysis.
[0028]
[0029] The performing mineral and organic matter content analysis may further include a process of performing analyses of logging data by natural gamma radiation, neutron porosity, density, electrical resistivity, and sonic logging.
[0030]
[0031] The performing mineral and organic matter content analysis may further include a process of calculating a volume of shale by using gamma-ray logging and a combination of neutron porosity and density logging.
[0032]
[0033] After classifying the collected samples into the major adsorption minerals and remainders excluding the major adsorption minerals as a clay mineral, the major adsorption minerals are derived by the following formula:
= VSh psh¨ Vsh pdays timain [0034] pain¨ Mays , where Vmain is a volume of the major adsorption minerals, pmain a density of the major adsorption minerals, pclays a density of the clay mineral, Vsh a volume of the shale, and psh a density of the shale.
Advantageous Effects [0035] As described above, the present invention provides an effect which enables the desorbed gas volume of a shale gas reservoir to be rapidly and accurately predicted and an effective and sustainable production of shale gas to be possible: by selecting minerals having high correlation as major adsorption minerals as major adsorption factors through an interaction formula using a correlation of mineral and organic matter contents analyzed from a boring core of a reservoir and a canister gas volume; and by allowing the desorbed gas volume distributed inside the shale gas reservoir to be predicted by using the correlation after deriving selected major mineral contents.
Description of Drawings [0036] FIG. 1 is a block diagram of a prediction apparatus 1 of a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis according to an embodiment of the present invention.
[0037] FIG. 2 is a flow chart showing a process of a prediction method of the desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis of the present invention.
[0038] FIG. 3 depicts graphs each showing a correlation of one of a combination of minerals inside a collected sample and a canister gas volume.
Mode for Invention [0039] In describing the present invention, detailed descriptions of prior arts and constituents which have been deemed to obfuscate the gist of the present invention will be omitted below.
[0040]
[0041] Since embodiments according to a concept of the present invention may be modified in various ways and have many types, specific embodiments will be illustrated in drawings and described in detail in the present description or application. However, it is to be understood that the embodiments according to the concept of the present invention are not limited to a specific disclosure, but, on the contrary, are intended to cover all kinds of modifications, equivalent arrangements or substitutes included within the spirit and technical scope of the present invention. In addition, a term "exemplary" is used to mean "as an example", "for example", or "plays a role as an illustration". Any aspects described with "exemplary" in this description should not be necessarily interpreted as they must be preferable to or advantageous than other aspects.
[0042]
[0043] When a constituent is referred to as being W "connected" or "joined" to another constituent, this should be understood that the constituent may be directly connected or joined to the other constituent, but a different constituent may be interposed therebetween. In contrast, when a constituent is referred to as being "directly connected" or "directly joined" to another constituent, this should be understood that no different constituent is interposed therebetween. Other expressions to explain relationship between other constituents such as "between"
and "just between" or "adjacent to" and "directly adjacent to" should be understood in the same way.
[0044] Terms used in the present specification are used to describe only specific embodiment and are not intended to limit the present disclosure. An expression in a singular form includes an expression in a plural form, unless the meaning is not obviously different conextually. It should be understood that terms such as "include" or "have" in the present disclosure are intended to designate the existence of a character, a numeral, a step, a movement, a constituent, a parts, or a combination of these which are embodied, and not to exclude at least one of other character, numeral, step, movement, constituent, parts, or combination of these, or an additional possibility.
[0045]
[0046] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings illustrating embodiments of the present invention.
[0047] Embodiments of the present invention predicted a desorbed gas volume inside shale by deriving major adsorption minerals by analyzing a correlation of mineral 0 and organic matter (TOC) contents analyzed from a boring core of the Montney Shale Gas Reservoir and a canister gas volume, and by deriving an interaction formula extracting contents of major adsorption minerals.
[0048]
[0049] FIG. 1 is a block diagram of a prediction apparatus 1 of a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis according to an embodiment of the present invention.
[0050] As illustrated in FIG. 1, the prediction apparatus 1 of the desorbed gas volume of the shale gas reservoir is configured to include: a mineral and organic matter content analysis part 10, a canister gas volume measurement part 20, a correlation analysis part 30, a major adsorption mineral content derivation part 40, and a desorbed gas volume prediction part 50.
[0051] The mineral and organic matter content analysis part 10 is configured to analyze mineral and organic matter contents by thermal analysis on a shale sample collected from a borehole.
Specifically, the mineral and organic matter content analysis part 10 is confjgured to analyze TOO
and kinds and contents of minerals through XRD analysis, natural gamma radiation, neutron porosity, density, electrical resistivity, and sonic logging. In addition, a volume of shale is configured to be calculated by using gamma-ray logging and a combination of neutron porosity and density logging.
[0052] The canister gas volume measurement part 20 is configured to measure gas contents by using a gas inside a canister sealing a collected shale sample.
[0053] The correlation analysis part 30 is configured to perform correlation analysis extracting minerals having high correlation (exceeding preset reference value) as major adsorption minerals having large gas adsorption volume by analyzing correlation of the mineral and gas contents.
[0054] The major adsorption mineral content derivation part 40 is configured to derive contents of the major adsorption minerals being extracted. In other words, after classifying the collected samples into major adsorption minerals and remainders excluding major adsorption minerals as a clay mineral, the contents of the major adsorption minerals are derived by the formula:
TT TirS h # psh¨ fish pelays main ¨
pmcall pc lays , where Vmain is a volume of the major adsorption minerals, pmain a density of the major adsorption minerals, pclays a density of the clay mineral, Vsh a volume of the shale, and psh a density of the shale.
[0055] The desorbed gas volume prediction part 50 is configured to predict contents of a gas adsorbed in a shale gas reservoir by inversely applying the interaction formula of derived contents of the major adsorption minerals and the correlation.
[0056]
[0057] FIG. 2 is a flow chart showing a process of a prediction method of a desorbed gas volume of a shale gas reservoir using a geophysical logging data analysis of the present invention.
[0058] As illustrated in FIG. 2, the prediction method of the desorbed gas volume of the shale gas reservoir is configured to include: a mineral and organic matter content analysis step S10, a canister gas volume measurement step S20, a correlation analysis step S30, a major adsorption mineral content derivation step S40, and a desorbed gas volume prediction step S50.
[0059] The mineral and organic matter content analysis step S10 is a process of analyzing minerals and organic matter by thermal analysis on a shale sample collected from a borehole by the mineral and organic matter content analysis part 10. In this process, TOC and kinds and contents of minerals are analyzed through XRD analysis, natural gamma radiation, neutron porosity, density, electrical resistivity, and sonic logging. In addition, the volume of shale is calculated by using gamma-ray logging and a combination of neutron porosity and density logging.
[0060] The canister gas volume measurement step S20 is a process of measuring gas contents by using a gas inside a canister sealing a collected sample by the canister gas volume measurement part 20.
[0061] The correlation analysis step S30 is a process wherein a correlation of the mineral and gas contents is analyzed by the correlation analysis pert 30, and minerals having high correlation are extracted as major adsorption minerals having a large adsorbed gas volume.
[0062] FIG. 3 depicts graphs each showing a correlation of one of a combination of minerals inside a collected sample and a canister gas volume.
[0063] As illustrated in FIG. 3, correlation of canister volume and various combinations of minerals are derived in the correlation analysis step S30 by the correlation analysis part 30, that is, correlations of canister volume to a clay mineral, canister volume to illite/mica and smectite, canister volume to illite/mica, canister volume to illite/smectite, canister volume to kaolinite, canister volume to chlorite, and so on.
[0064] In the case of FIG. 3, the desorbed gas content and correlation for each combination of minerals are as follows.
[0065] 8.966 + 0.743*Volume of Clay minerals R2= 0.442 [0066] 7.748 + 0.971*Volume of Illite/Smectite/Mica R2=
0.537 [0067] 6.317 + 8.534*Volume of Illite/Smectite R2= 0.682 [0068] 8.150 + 1.079*Volume of Illite/Mica R2= 0.510 [0069] 19.47 + 0.982*Volume of Chlorite R2-= 0.034 [0070] 20.90 + 7.996*Volume of Kaolinite R2= 0.442 [0071]
[0072] In the case of FIG. 3, as a result of correlation analysis, the illite was identified as having the largest desorbed gas volume and correlation.
[00731 [0074] With reference to FIG. 2 again, after deriving major adsorption minerals having large desorbed gas content and correlation by performing the correlation analysis step S30 as described above, contents of the major adsorption minerals are derived by the major adsorption mineral content derivation step S40. At this time, to derive a content of the illite of a major adsorption mineral, a collected sample is classified into the illite of the major adsorption mineral W and remainders excluding the illite as a clay mineral. Then, after substituting major adsorption minerals with the illite, the content of the illite is derived by a following interaction formula.
Villite Vsh = psh-Vvh = pclays pillite-pclays [0075] , where Villite is a volume of the illite as the major adsorption mineral, pillite a density of the illite, pclays a density of the clay mineral, Vsh a volume of shale, and psh a density of shale.
[0076]
Subsequently, the desorbed gas volume in the shale gas reservoir in an investigating area is predicted by inversely applying correlation of each of a combination of minerals and the desorbed gas volume in the desorbed gas
16 volume prediction step S50 after deriving the content of the illite as major adsorption mineral.
Industrial Applicability [0077] The present invention may be applied to an industry to develop shale gas resources.
Industrial Applicability [0077] The present invention may be applied to an industry to develop shale gas resources.
Claims (10)
1. A prediction apparatus of a desorbed gas volume of a shale gas reservoir, the prediction apparatus comprising:
a mineral and organic matter content analysis part analyzing minerals and organic matter contents by thermal analysis of a shale sample collected from a borehole;
a canister gas volume measurement part measuring desorbed gas contents by using a gas inside a canister sealing the shale sample;
a correlation analysis part extracting minerals having a correlation between the minerals and the desorbed gas contents exceeding a preset reference value as major adsorption minerals by analyzing the correlation between the minerals and the desorbed gas contents;
a major adsorption mineral content derivation part deriving contents of the major adsorption minerals; and a desorbed gas volume prediction part predicting contents of a gas adsorbed in a shale gas reservoir by using an interaction formula of the contents of the major adsorption minerals and the correlation between the minerals and the desorbed gas contents.
a mineral and organic matter content analysis part analyzing minerals and organic matter contents by thermal analysis of a shale sample collected from a borehole;
a canister gas volume measurement part measuring desorbed gas contents by using a gas inside a canister sealing the shale sample;
a correlation analysis part extracting minerals having a correlation between the minerals and the desorbed gas contents exceeding a preset reference value as major adsorption minerals by analyzing the correlation between the minerals and the desorbed gas contents;
a major adsorption mineral content derivation part deriving contents of the major adsorption minerals; and a desorbed gas volume prediction part predicting contents of a gas adsorbed in a shale gas reservoir by using an interaction formula of the contents of the major adsorption minerals and the correlation between the minerals and the desorbed gas contents.
2. The prediction apparatus of claim 1, wherein the mineral and organic matter content analysis part is configured to analyze TOC of organic matter and constituent and contents of minerals through XRD analysis.
3. The prediction apparatus of claim 2, wherein the mineral and organic matter content analysis part is configured to perform analyses of logging data by natural gamma radiation, neutron porosity, density, electrical resistivity, and sonic logging.
4. The prediction apparatus of claim 2, wherein the mineral and organic matter content analysis part is configured to calculate a volume of shale by using a gamma-ray logging and a combination of neutron porosity and density logging.
5. The prediction apparatus of claim 1, wherein after classifying the shale sample into the major adsorption minerals and a clay mineral, the contents of the major adsorption minerals are derived by a formula where Vmain is a volume of the major adsorption minerals, pmain a density of the major adsorption minerals, pclays a density of the clay mineral, Vsh a volume of the shale, and psh a density of the shale.
6. A method of predicting a desorbed gas volume of a shale gas reservoir, the method comprising:
using a mineral and organic matter content analysis part, performing a mineral and organic matter content analysis analyzing minerals and organic matter contents by thermal analysis on a shale sample collected from a borehole;
using a canister gas volume measurement part, performing a canister gas volume measurement measuring desorbed gas contents by using a gas inside a canister sealing the shale sample;
using a correlation analysis part, performing a correlation analysis extracting minerals having a correlation between the minerals and the desorbed gas contents exceeding a preset reference value as major adsorption minerals by analyzing the correlation between the minerals and the desorbed gas contents;
using a major adsorption mineral content derivation part, performing a major adsorption mineral content derivation deriving contents of the major adsorption minerals; and using a desorbed gas volume prediction part, performing a desorbed gas volume prediction predicting contents of a gas adsorbed in the shale gas reservoir by using the contents of the major adsorption minerals and the correlation between the minerals and the desorbed gas contents.
using a mineral and organic matter content analysis part, performing a mineral and organic matter content analysis analyzing minerals and organic matter contents by thermal analysis on a shale sample collected from a borehole;
using a canister gas volume measurement part, performing a canister gas volume measurement measuring desorbed gas contents by using a gas inside a canister sealing the shale sample;
using a correlation analysis part, performing a correlation analysis extracting minerals having a correlation between the minerals and the desorbed gas contents exceeding a preset reference value as major adsorption minerals by analyzing the correlation between the minerals and the desorbed gas contents;
using a major adsorption mineral content derivation part, performing a major adsorption mineral content derivation deriving contents of the major adsorption minerals; and using a desorbed gas volume prediction part, performing a desorbed gas volume prediction predicting contents of a gas adsorbed in the shale gas reservoir by using the contents of the major adsorption minerals and the correlation between the minerals and the desorbed gas contents.
7. The method of claim 6, wherein the performing minerals and organic matter content analysis is a process of analyzing TOC of an organic matter and constituent and contents of minerals through XRD analysis.
8. The method of claim 7, wherein the performing mineral and organic matter content analysis further includes a process of performing analyses of logging data by natural gamma radiation, neutron porosity, density, electrical resistivity, and sonic logging.
9. The method of claim 7, wherein the performing mineral and organic matter content analysis further includes a process of calculating a volume of shale by using gamma-ray logging and a combination of neutron porosity and density logging.
10. The method of claim 6, wherein after classifying the shale sample into the major adsorption minerals and a clay mineral, the contents of the major adsorption minerals are derived by a formula where Vmain is a volume of the major adsorption minerals, pmain a density of the major adsorption minerals, pclays a density of the clay mineral, Vsh a volume of the shale, and psh a density of the shale.
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| KR10-2016-0144505 | 2016-11-01 | ||
| PCT/KR2017/004208 WO2018084394A1 (en) | 2016-11-01 | 2017-04-19 | Apparatus for predicting amount of desorption gas in shale gas layer by using geophysical well logging data analysis and method therefor |
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| CN108896509A (en) * | 2018-07-30 | 2018-11-27 | 中国华能集团有限公司 | In-site measurement collects shale gas desorption quantity and the integrated experimental system of component analysis |
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