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Method for determining ancient shear strength of shale

A technology of shear strength, rock, applied in the field of oil and gas exploration

Active Publication Date: 2017-12-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The rock fracture criterion given by the stress Mohr's circle can only obtain the current shear strength of mud shale
So far there is no technical method on how to determine the paleo-shear strength of shale

Method used

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  • Method for determining ancient shear strength of shale
  • Method for determining ancient shear strength of shale
  • Method for determining ancient shear strength of shale

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Embodiment Construction

[0056] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0057] like figure 1 Shown is a flow chart of a method according to an embodiment of the present invention, as Image 6 Shown is the corresponding algorithm flow chart, the following reference figure 1 and Image 6 The present invention will be described in detail.

[0058] The first step is step S110 to establish a shear strength calculation model. Based on the stress Mohr's circle and the relationship b...

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Abstract

The invention discloses a method for determining the ancient shear strength of shale. The method comprises: a step of establishing a shear strength calculating model, which takes cohesive force, internal friction angle, maximum principal stress and minimum principal stress as variables, by performing derivation, based on a relation of stress Mohr's circle and direct stress and differential stress; and a step of calculating the ancient shear strength by introducing a time function into variables of cohesive force, internal friction angle, maximum principal stress and minimum principal stress through the shear strength calculating model. The method allows the ancient shear strength of shale to be determined.

Description

technical field [0001] The invention belongs to the technical field of oil and gas exploration, and in particular relates to a method for determining the paleo-shear strength of mud shale. Background technique [0002] In the field of oil and gas exploration, mud shale is the object of shale gas exploration. Shale gas exploration evaluation needs to understand the organic carbon content of shale, thermal evolution degree of organic matter, kerogen type, thickness, buried depth, porosity, permeability and other index parameters, and the mechanical properties (including elastic properties) of shale and strength properties) are also essential evaluation parameters. The strength parameters of shale include tensile strength, compressive strength and shear strength, among which the shear strength is an essential parameter for judging the formation and evolution of shale fractures. [0003] The study of shale fractures is of great significance to the evaluation of the preservatio...

Claims

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Application Information

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IPC IPC(8): G01N33/00
Inventor 袁玉松周雁邱登峰孙炜
Owner CHINA PETROLEUM & CHEM CORP
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