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Multi-wave combined pre-stack waveform inversion method

A technology of waveform inversion and pre-stack gathers, which is applied in the field of seismic exploration and can solve problems such as low computational efficiency

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

[0022] Purpose of the invention: In order to overcome the low calculation efficiency of the previous pre-stack waveform nonlinear inversion method, the present invention proposes a multi-wave combined pre-stack waveform inversion method, which uses a linear inversion strategy and utilizes multiple The pre-stack waveform linear inversion method of wave records makes more use of multi-wave information and converted wave and multiple wave information of seismic records to improve the accuracy of elastic parameter inversion

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[0136] In order to facilitate the skilled person's understanding of the present technology, the following will further describe the present invention in conjunction with the accompanying drawings and embodiments, which cannot be used to limit the protection scope of the present invention. Here we take a logging model test as an example to illustrate:

[0137] figure 1 It is an implementation process of a multi-wave joint pre-stack waveform inversion method according to the present invention, which specifically includes the following steps:

[0138] 1. PP and PS record simulation of generalized transfer matrix

[0139] According to the convolution theory, seismic records can be obtained by convolution of seismic wavelets and reflection coefficients, which is equivalent to the product of wavelet matrix and reflection coefficient sequence. PP and PS synthesis record d PP and d PS Can be obtained by the following formula:

[0140]

[0141] The expanded form is:

[0142] ...

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Abstract

The invention discloses a multi-wave combined pre-stack waveform inversion method. The pre-stack seismic inversion method mainly comprises two major types of a forward operator based on ray tracing and a forward operator based on wave equations, wherein the forward operator based on ray tracing is pre-stack AVO inversion with the widest application, and the forward operator based on wave equationsis called pre-stack waveform inversion. Different from the pre-stack AVO inversion, the pre-stack waveform inversion method can better apply complex wave field response in input data, reduce the processing difficulty of the input data, and improve the sensitivity of seismic records to target inversion parameters. At present, a nonlinear inversion strategy is mostly adopted for the pre-stack waveform inversion, and the calculation efficiency is too low. The invention provides a linear strategy pre-stack inversion method so as to reduce the calculation time. Meanwhile, in order to improve the inversion precision and stability, a PP and PS multi-wave data joint inversion strategy is adopted, and the method can effectively improve the inversion precision of three parameters, especially for transverse wave speed and density estimation. A logging model test verifies the effectiveness of the method.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, belongs to the field of multi-parameter inversion of seismic data, and in particular relates to a multi-wave combined pre-stack waveform inversion method. Background technique [0002] At present, prestack seismic inversion methods mainly include two types, one is the prestack AVO inversion method based on ray tracing forward operators, and the other is prestack waveform inversion based on wave equation forward operators [1]. The advantage of the first type of pre-stack AVO inversion lies in the simple assumption of a single interface, the mathematical form is relatively simple, and it has high calculation efficiency, so it is the most widely used in actual seismic exploration. Different from pre-stack AVO inversion, pre-stack waveform inversion uses a wave equation-like simulation algorithm as the forward operator, which can better utilize the full wave field response in actual data ...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/307G01V2210/512
Inventor 雒聪巴晶戚慧王恩江肖爽李帆
Owner HOHAI UNIV
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