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Deep shale gas compressibility evaluation method based on fuzzy grey correlation method

A grey relational method, gas compressibility technology, applied in the field of exploration

Pending Publication Date: 2019-09-27
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Existing technologies are still unable to solve the problem of compressibility evaluation of deep shale gas

Method used

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  • Deep shale gas compressibility evaluation method based on fuzzy grey correlation method
  • Deep shale gas compressibility evaluation method based on fuzzy grey correlation method
  • Deep shale gas compressibility evaluation method based on fuzzy grey correlation method

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Embodiment Construction

[0030] The fracability is an evaluation of the ease of forming a complex fracture network for volume fracturing in shale gas fracturing. The present invention analyzes and summarizes the main parameters of shale gas compressibility evaluation methods at home and abroad, and combines the characteristics of high temperature, high pressure and strong plasticity of deep shale gas layers, and optimizes the compressibility of deep shale gas mainly from the aspects of geological and engineering factors Comprehensively evaluate parameters; fully consider the influence of formation confining pressure and rock anisotropy on parameters, and form a calculation method for compressibility evaluation parameters; use fuzzy gray correlation analysis method to analyze compressibility index curves and fractures with different weight combinations According to the correlation of the complexity index curve, the weight combination was optimized according to the principle of the maximum correlation co...

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Abstract

Main parameters of domestic and overseas shale gas compressibility evaluation methods are analyzed and summarized, the high-temperature, high-pressure and high-plasticity characteristics of a deep shale gas layer are combined, and deep shale gas compressibility comprehensive evaluation parameters are optimized mainly from the aspects of geology and engineering factors; the influence of formation confining pressure and rock anisotropy on parameters is fully considered, and a calculation method of compressibility evaluation parameters is formed; a fuzzy grey correlation analysis method is used; analyzing the correlation between the compressibility index curve and the crack complexity index curve of different weight combinations; the weight combination is optimized according to the maximum principle of the correlation coefficient, a compressibility comprehensive evaluation mathematical model is established, a deep shale gas compressibility comprehensive evaluation method is formed, and the method has guiding significance for the fracturing parameter optimization design of the deep shale gas for improving the crack complexity.

Description

technical field [0001] The invention relates to the field of exploration, in particular to a deep shale gas compressibility evaluation method based on a fuzzy gray correlation method. Background technique [0002] The fracability is an evaluation of the ease of forming a complex fracture network for volume fracturing in shale gas fracturing. At present, the main compressibility evaluation methods include four types: evaluating compressibility according to the content of all brittle minerals and rock brittleness, evaluating compressibility according to rock brittleness and fracture toughness / fracture energy, comprehensively considering quartz content, rock brittleness , natural fracture development degree, horizontal stress difference and other parameters to evaluate the compressibility. Six evaluation parameters directly related to fracture complexity are used from different angles, namely, brittle mineral content, clay mineral content, rock brittleness, and horizontal stres...

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Application Information

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IPC IPC(8): G06Q10/06
CPCG06Q10/0639Y02P90/30
Inventor 刘洪何龙钟森张俊波于希南张旭肖晖龙章亮黄园园张潇宇古佳月
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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