Seismic inversion method and device

A seismic inversion, vertical direction technology, applied in the field of geological exploration, can solve the problems of large error of VTI parameters, inability to meet the requirements of fine characterization of oil reservoirs, and complex approximate formula of accurate reflection coefficient.

Active Publication Date: 2017-08-25
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

However, during the inversion process, due to the complexity of the exact reflection coefficient approximation formula, it is difficult to directly use it in the inversion
At the same time, due to the low calculation accuracy of the precise reflection coefficient formula of the VTI medium, in the case of strong anisotropy, strong impedance difference and large incident angle, the VTI parameters obtained by inversion have large errors, which cannot meet the requirements of actual reservoirs. Layer fine characterization requirements

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[0035] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0036] Considering that in the prior art, when AVA inversion is performed based on VTI medium, the existing accurate VTI medium reflection coefficient formula is very complicated, which leads to the problem of low reservoir exploration accuracy, the inventor proposes a new VTI medium A simplified method for calculating the reflection coef...

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Abstract

The invention provides a seismic inversion method and a device. The method comprises the following steps: determining the vertical slowness relation of plane P-wave in a reservoir to be tested based on the value of P-wave velocity in the vertical direction in the reservoir to be tested, the change of P-wave velocity with phase angle near vertical incidence, the horizontal slowness, and the difference between P-wave velocity in the transverse direction and P-wave velocity in the vertical direction; determining the vertical slowness relation of plane S-wave in the reservoir to be tested according to the value of S-wave velocity in the vertical direction in the reservoir to be tested; and building a new reflection coefficient calculation approach of a transversely isotropic medium with a vertical symmetry axis, and inverting the reservoir to be tested. In the embodiment of the invention, the two relations have high calculation accuracy, and have a relatively simple form and relatively weak nonlinearity. The simplified reflection coefficient calculation approach has high calculation accuracy under the conditions of strong anisotropy, large impedance difference and large incident angle. The accuracy of oil exploration is improved.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a seismic inversion method and device. Background technique [0002] Seismic inversion can refer to the process of inferring stratum lithology and structure by using seismic data observed on the surface and constrained by known geological laws and drilling and logging data. From the seismic data used in seismic inversion, seismic inversion can be divided into: pre-stack inversion and post-stack inversion; from the seismic information used in inversion: seismic inversion can be divided into: seismic wave travel time inversion Seismic inversion and seismic wave amplitude inversion; from the geological results of inversion, seismic inversion can be divided into: structural inversion, wave impedance inversion, reservoir parameter inversion, geostatistical inversion, etc. [0003] At present, the following methods can generally be used to realize the inversion of the m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/28G01V1/306G01V2210/624
Inventor 李景叶陈小宏周林王守东马继涛刘国昌
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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