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Pre-stack seismic multi-parameter inversion method of shale reservoirs

A pre-stack seismic, shale reservoir technology, applied in the field of seismic exploration

Active Publication Date: 2020-04-17
HOHAI UNIV
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Problems solved by technology

[0018] Purpose of the invention: Aiming at the inversion problem of the current layered geological model, the present invention proposes a pre-stack seismic multi-parameter inversion method for shale reservoirs

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  • Pre-stack seismic multi-parameter inversion method of shale reservoirs
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  • Pre-stack seismic multi-parameter inversion method of shale reservoirs

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Embodiment Construction

[0131] In order to facilitate technical personnel's understanding of the present technology, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments, which cannot be used to limit the protection scope of the present invention.

[0132] This embodiment takes a well logging model test as an example for illustration:

[0133] figure 1 It is an implementation process of the pre-stack multi-parameter inversion method suitable for shale and other models with strong horizontal bedding structure. The parameter values ​​of the test model are as follows: figure 2 Shown; specifically include the following steps:

[0134] 1. Recursive matrix forward modeling for elastic isotropic media

[0135] The initial model parameter vector m can be obtained from well logging data, as follows:

[0136] m=[α 1 … α n beta 1 … β n ρ 1 … ρ n ] T (1)

[0137] Among them, the model has a total of n layer...

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Abstract

The invention discloses a pre-stack seismic inversion method suitable for shale reservoirs with strong horizontal stratification structures and the like. Different from a conventional inversion methodbased on an equivalent VTI medium reflection coefficient formula, the method selects a recursive matrix algorithm as a forward modeling drive of prestack inversion. According to the recursive matrixalgorithm, a wave equation accurate solution and a recursive data mode are combined, and the internal complex wave field effect of shale and the like with a strong stratified structure can be effectively simulated. The recursive matrix based prestack inversion method is based on isotropic hypothesis, can reduce target parameters and improve inversion stability, and can be used for estimating elastic parameters of stratified structure reservoirs such as shale, eliminating the influence of a complex wave field in the shale on an underlying stratum and recovering attribute characteristics of theunderlying stratum. A synthetic record test of model parameters proves the effectiveness of the method provided by the invention.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, and belongs to the category of multi-parameter inversion of seismic data, in particular to a pre-stack seismic multi-parameter inversion method for shale reservoirs. Background technique [0002] With the increasing demand for oil and natural gas worldwide, the direction of oil and gas exploration is gradually shifting from conventional oil and gas reservoirs to unconventional oil and gas reservoirs. Compared with conventional homogeneous porous sandstone, unconventional reservoir type can be unconventional lithology, unconventional reservoir space and unconventional electrical characteristics, etc. The most important unconventional reservoirs include shale reservoirs, carbonate reservoirs and so on. At present, shale exploration has achieved preliminary results, but most of the seismic exploration technologies were proposed for conventional porous sandstone reservoirs in the past, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/307G01V2210/512
Inventor 雒聪巴晶王恩江魏颐君何润发
Owner HOHAI UNIV
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