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Method and device for determining root mean square speed

A root-mean-square velocity and determination method technology, applied in the field of geological exploration, can solve problems such as inability to reflect the fine change characteristics of seismic velocity

Active Publication Date: 2017-05-31
PETROCHINA CO LTD
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Problems solved by technology

[0004] The embodiment of the present invention provides a method and device for determining the root mean square velocity to solve the problem in the prior art that the fine change characteristics of the seismic velocity cannot be reflected when analyzing the velocity spectrum of the work area to be measured

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  • Method and device for determining root mean square speed
  • Method and device for determining root mean square speed

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Embodiment Construction

[0034] 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.

[0035] Considering the problem that the variation characteristics of seismic velocity cannot be accurately reflected when determining the root mean square velocity in the prior art, the inventor proposes to increase the number of interpretation samples of seismic data, that is, to perform dense sampling of seismic data in the work area to ...

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Abstract

The invention provides a method and a device for determining root mean square speed. The method comprises the following steps: acquiring seismic data of a to-be-measured work area; performing encryption sampling on the seismic data, performing correlation analysis on an area determined by each sampling point in the encrypted seismic data and seismic response data of each sampling point in the encrypted seismic data, and selecting a time-window central point corresponding to an analysis result which meets a preset requirement from a plurality of correlation analysis results to serve as an offset sample point corresponding to a speed to-be-measured sample point; and determining the root mean square speed of the speed to-be-measured sample point. In the embodiment of the invention, the existing seismic data is subjected to encryption sampling, correlation analysis is conducted on the speed to-be-measured sample point after encryption sampling and the surrounding seismic data, the root mean square speed of the encrypted sample point is determined according to the analysis results, and the to-be-measured sample points are increased by a method for performing encryption sampling on the seismic data, so that the aim of subtly reflecting the change characteristic of seismic speed can be fulfilled.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a method and device for determining root mean square velocity. Background technique [0002] The accuracy of velocity modeling directly affects the quality of seismic imaging, and the quality of seismic wave imaging mainly depends on the accuracy of the velocity-depth geological model. Therefore, seismic velocity analysis and modeling is a key technology for seismic imaging to obtain high-fidelity, high-signal-to-noise ratio, and high-resolution seismic sections. [0003] Geological information such as seismic waveforms, offsets, and wave field velocities are related to seismic velocity prediction, and they can be converted to each other. Velocity analysis of pre-stack seismic gathers is an important part of seismic information extraction. In the prior art, seismic gather velocity spectrum analysis can be performed by scanning the seismic velocity spectrum, and pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
CPCG01V1/303G01V2210/6222
Inventor 杜斌山雍学善王建功刘应如张平李积永
Owner PETROCHINA CO LTD
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