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Method for determining compressibility coefficient of shale reservoir

A technology of shale reservoir and coefficient, applied in the field of shale gas exploration, can solve the problems of inability to comprehensively reflect the fractability of shale, discontinuity, and limited number of cores

Inactive Publication Date: 2019-01-15
CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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Problems solved by technology

The number of cores taken by the core brittleness evaluation method is limited and discontinuous, and most of the factors considered in the calculation of fracturing coefficients are single, which cannot comprehensively reflect the fracturing properties of shale

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  • Method for determining compressibility coefficient of shale reservoir

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with the drawings.

[0051] Such as figure 1 The methods shown to determine the fracturing coefficient of shale reservoirs include:

[0052] Step 1. Determine the standardized value S of shale brittleness 1 , Standardized value S of natural fracture development degree 2 , Standardized value of horizontal stress difference S 3 And the standardized value S 4 .

[0053] Since the brittleness of shale is affected by the content of brittle minerals, Young's modulus, Poisson's ratio brittleness index, and compressive tensile strength brittleness index, the standardized value S of shale brittleness is determined 1 Steps (see figure 2 )for:

[0054] The first step is to determine the standardized value S of brittle mineral content 1-1 , Young's modulus and Poisson's ratio brittleness index standardized value S 1-2 And the standardized value S of the brittleness index of compressive and tensile strength 1-3 .

[005...

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Abstract

The invention discloses a method for determining the compressibility coefficient of a shale reservoir. The method comprises the following steps: determining a shale brittleness standardization value S1, a natural crack development degree standardization value S2, a horizontal stress difference standardization value S3 and a reservoir gas containing standardization value S4; and determining the weight ratio W1 of the shale brittleness standardization value S1, and the weight ratio W2 of the natural crack development degree standardization value S2, the weight ratio W3 of the horizontal stress difference standardization value S3 and the weight ratio W4 of the reservoir gas containing standardization value S4 by adopting an analytic hierarchy process; and calculating the compressibility coefficient Fi of the shale reservoir by means of the formula FI=S1W1+S2W2+S3W3+S4W4. By adopting the method, the obtained compressibility coefficient of the shale reservoir is more accurate and reasonable, and the technical support is provided for field shale gas well perforation fracture parameter arrangement optimization.

Description

Technical field [0001] The invention belongs to the field of shale gas exploration, and specifically relates to a method for determining the fracturability coefficient of a shale reservoir. Background technique [0002] my country has abundant reserves of shale gas resources. With the continuous increase of mining depth, the mining environment of shale reservoirs such as temperature and in-situ stress becomes more and more complex. When perforating fracturing is used, due to the fracturing ability of the reservoir Uncertain location results in low efficiency of perforation and fracturing. At present, the fracturability evaluation of shale reservoirs is mainly reflected by two methods: core brittleness evaluation in the laboratory and fracturing coefficient calculation. The core brittleness evaluation method takes a limited number of cores and is not continuous, and most of the factors considered in the calculation of fracturing coefficients are single, which cannot comprehensivel...

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Application Information

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IPC IPC(8): E21B43/26E21B49/00G06F17/50G06Q50/02
CPCE21B43/26E21B49/00G06Q50/02
Inventor 程玉刚潘林华陆朝晖张烨贺培董兵强
Owner CHONGQING INST OF GEOLOGY & MINERAL RESOURCES
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