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Forward modeling method for wave field propagation characteristics of shale with vertical fractures

A forward modeling and wave field technology, applied in the field of exploration, can solve the problem of inability to accurately reveal the wave field propagation characteristics of high-angle fractures in shale

Active Publication Date: 2019-10-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a forward modeling method for the wave field propagation characteristics of shale with vertical fractures, so as to solve the technical problem that the prior art cannot accurately reveal the wave field propagation characteristics of high-angle fractures in shale

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  • Forward modeling method for wave field propagation characteristics of shale with vertical fractures
  • Forward modeling method for wave field propagation characteristics of shale with vertical fractures
  • Forward modeling method for wave field propagation characteristics of shale with vertical fractures

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[0029] 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.

[0030] An embodiment of the present invention provides a forward modeling method for wave field propagation characteristics of shale with vertical fractures. In this forward modeling method, the elastic matrix of the orthotropic medium in the observation coordinate system is constructed first, and the second-order wave equation is derived, and then the numerical simulation of the wave field is carried out by ...

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Abstract

The invention discloses a forward modeling method for wave field propagation characteristics of shale having vertical fractures, belongs to the technical field of exploration and is to solve the technical problem that wave field propagation characteristics of the shale having high-angle fractures cannot be revealed accurately in the prior art. The forward modeling method for wave field propagation characteristics of the shale having vertical fractures comprises the following steps: constructing an orthogonal anisotropic medium elastic matrix under a constitutive coordinate system; constructing an orthogonal anisotropic medium elastic matrix under an observation system based on the orthogonal anisotropic medium elastic matrix constructed under the constitutive coordinate system; obtaining an orthogonal anisotropic medium second-order wave equation based on the orthogonal anisotropic medium elastic matrix constructed under the observation system; and obtaining the wave field propagation characteristics based on the orthogonal anisotropic medium second-order wave equation.

Description

technical field [0001] The invention relates to the technical field of exploration, in particular to a forward modeling method for the wave field propagation characteristics of shale with vertical fractures. Background technique [0002] Shale gas is a hot spot in exploration today, and a clear understanding of the wave field propagation characteristics and amplitude variation of shale is very necessary for the exploration of shale gas. [0003] Because shale has bedding characteristics, shale is usually abstracted as a transversely isotropic medium in numerical simulations. In reality, high-angle natural fractures are often developed in shale, and the development of fractures is one of the main factors indicating the distribution of shale "sweet spots". Therefore, it is necessary to abstract this type of medium into mathematical orthotropy. [0004] The conventional forward modeling of fracture equivalent medium is based on the numerical simulation in the constitutive coor...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28
Inventor 许凯肖鹏飞梁志强罗亨胡起
Owner CHINA PETROLEUM & CHEM CORP
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