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Method for solving energy nonuniform problem during multiple three-dimensional seismic data fusion processing before stacking

A 3D seismic and fusion processing technology, applied in the direction of seismic signal processing, etc., can solve the problems of uneven energy and offset arcing in the fusion processing of multiple 3D seismic data, so as to eliminate the phenomenon of offset arcing, improve work efficiency, cost reduction effect

Inactive Publication Date: 2014-07-09
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for solving energy unevenness in the pre-stack fusion processing of multi-block 3D seismic data, so as to solve the problem of migration and arcing caused by the uneven energy in the fusion processing of multi-block 3D seismic data in the prior art

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  • Method for solving energy nonuniform problem during multiple three-dimensional seismic data fusion processing before stacking
  • Method for solving energy nonuniform problem during multiple three-dimensional seismic data fusion processing before stacking
  • Method for solving energy nonuniform problem during multiple three-dimensional seismic data fusion processing before stacking

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] Concrete scheme of the present invention is as follows:

[0022] (1) Dynamic correction and resection

[0023] On the CMP (common reflection point) gathers of multiple blocks of 3D seismic data that have been pre-processed by pre-stack denoising, static correction, deconvolution, etc., the gathers are firstly corrected dynamically using accurate stacking velocities, and then Gathers are dynamically corrected and stretched to remove energy anomalies caused by stretching distortion and statistical errors caused by abnormal energy.

[0024] Such as figure 1 As shown, the marked line at the bottom of the figure is a suitable cut, and compared with the marked line at the top, it is more thorough to remove the dynamic correction stretching distortion frequency.

[0025] (2) Calculate the coverage times of the data

[0026] Perform pure wave stacking on t...

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Abstract

The invention relates to a method for solving an energy nonuniform problem during multiple three-dimensional seismic data fusion processing before stacking. Firstly, movable correction and cutting are carried out on CMP gathers before stacking, the signal to noise ratio and the effective covering times of each CMP surface element are calculated, energy adjustment factors are calculated according to the signal to noise ratio and relative functions of the effective covering times, then smooth filtering is carried out on the energy adjustment factors, the energy adjustment factors are applied to the CMP gathers for energy adjustment, and ultimately, deviation processing is carried out before stacking. The method solves the arc drawing deviation problem in the prior art caused due to the fact that energy is nonuniform during multiple three-dimensional seismic data fusion processing.

Description

technical field [0001] The invention relates to the field of oil and gas seismic exploration, in particular to a method for solving energy unevenness in pre-stack fusion processing of multi-block three-dimensional seismic data. Background technique [0002] Prestack time (or depth) migration technology has become a key processing technology for seismic exploration in complex areas. When the multi-block 3D seismic data fusion processing is performed, due to the great difference in the local coverage times and the serious energy unevenness in the work area, the phenomenon of arc drawing occurs in the pre-stack migration imaging processing. This illusion has serious consequences for the reality of geological formations. [0003] In recent years, in order to solve the problem of migration and arcing caused by energy unevenness in the fusion processing of multiple 3D seismic data, methods such as regional amplitude equalization, local energy calibration, and seismic trace interp...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 何和英张高成商建立孔剑冰姚振方
Owner CHINA PETROLEUM & CHEM CORP
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