Pre-stack seismic wide angle retrieval method

A pre-stack seismic and pre-stack inversion technology, applied in the field of geophysical exploration, can solve the problems of large error, difficult to meet approximation conditions, difficult to improve the pre-stack inversion accuracy of large-angle seismic data, etc., to achieve effective use and avoid approximation. Effects of Errors, Effects of Avoiding Conditioning

Active Publication Date: 2013-08-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] The current prestack inversion methods are almost all based on the approximate formula of the Zoeppritz equation, which are only suitable for weakly reflective medium interfaces and reflection problems at medium and small angles (or small offsets), but the actual situation is often difficult to satisfy the approximation that the formula holds condition
[0006] In the range of small angles, as long as the formation pa

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[0055] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0056] Such as figure 1 as shown, figure 1 It is a flow chart of the pre-stack seismic wide-angle inversion method of the present invention.

[0057] In step 101, three angle-stacked seismic data volumes, three corresponding wavelets, and an initial model of P-wave velocity, shear-wave velocity, and density are input, and the angular range of the angle-stacked seismic data volume depends on specific conditions.

[0058] In one embodiment, the number of input angle-stacked seismic data volumes and corresponding wavelets is at least three.

[0059] The process goes to step 102.

[0060] In step 102, a pre-stack inversion objective function is established.

[0061] According to the idea of ​​generalized linear inversion, the following objecti...

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Abstract

The invention provides a pre-stack seismic wide angle retrieval method. The pre-stack seismic wide angle retrieval method comprises the following steps: inputting at least three angle stacking seismic data volumes, at least three corresponding wavelets, longitudinal wave speeds, a transverse wave speed and an initial density model; creating a pre-stack retrieval objective function; expanding the taylor series of the pre-stack retrieval objective function; deriving parameters through the matrix form of a Zoeppritz equation to obtain the partial derivatives of a reflection coefficient to the longitudinal wave speeds, the transverse wave speed and the density; according to actual data, decreasing computing amount through matrix partitioning; computing the perturbation of a retrieval parameter; and controlling the convergence of the retrieval objective function through the computed perturbation of the retrieval parameter to obtain a pre-stack retrieval parameter. The pre-stack seismic wide angle retrieval method solves the problems that the approximate conditions of the validity of the Zoeppritz equation are difficult to met and the error is great in the prior art, and has the advantages of wide application range, small error and high retrieval precision.

Description

technical field [0001] The invention relates to geophysical exploration technology, in particular to a pre-stack seismic wide-angle inversion method. Background technique [0002] Pre-stack seismic inversion can provide a variety of effective formation parameter data results, and is an important technique for complex reservoir description. [0003] The Zoeppritz equation describes the relationship between reflection and transmission of waves propagating in the upper and lower media, and is the theoretical basis of pre-stack seismic inversion. [0004] Due to the large amount of calculation to obtain the exact solution of the Zoeppritz equation, and the reason that the inversion coefficient matrix is ​​"ill-conditioned", problems such as unstable calculation and non-convergence of the objective function will be encountered in the actual application process. [0005] The current prestack inversion methods are almost all based on the approximate formula of the Zoeppritz equati...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 孟宪军王玉梅慎国强苗永康刘立彬钮学民张洪王希萍王振涛张达汪浩邓金华陈松莉李燕张春
Owner CHINA PETROLEUM & CHEM CORP
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