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AVO (Amplitude Versus Offset) correction method for use under combined earthquake focus condition

A correction method and seismic source technology, applied in the field of oil exploration, can solve problems such as no correction method for reflected energy

Inactive Publication Date: 2012-10-03
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0003] However, no correction method for reflected energy in the case of combined sources has been proposed at home and abroad

Method used

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  • AVO (Amplitude Versus Offset) correction method for use under combined earthquake focus condition
  • AVO (Amplitude Versus Offset) correction method for use under combined earthquake focus condition
  • AVO (Amplitude Versus Offset) correction method for use under combined earthquake focus condition

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Embodiment Construction

[0033] Further illustrate the present invention below in conjunction with accompanying drawing.

[0034] The invention is based on a linear combined seismic source system, and performs energy correction on the AVO curve of the combined seismic source to improve the analysis accuracy of the AVO. The present invention is realized by wave equation numerical simulation. Assume that there are two horizontal layered models: the size of the model is 2000m horizontally and 2000m vertically, the depth of the target layer is 1000m, the compressional wave velocity of the upper layer is 3000m / s, the compressional wave velocity of the lower layer is 4000m / s, and the density is constant. The grid size is △x=△z=5m, the time sampling interval is 0.5ms, the seismic source adopts the Reker wavelet with the main frequency of 30Hz, and the three seismic sources are combined for excitation. For horizontal layered theoretical models, CSP gathers can be used instead of CRP gathers.

[0035] Extrac...

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Abstract

The invention relates to an AVO (Amplitude Versus Offset) correction method for use under a combined earthquake focus condition. The method comprises the following steps of: (1) evaluating a combined earthquake focus field strength direction factor; (2) extracting reflecting layer energy to obtain the change rule of reflected energy along with a shot-geophone distance; and (3) performing energy correction to obtain the change rule of corrected reflected energy along with the shot-geophone distance, and realizing a program. Disclosed mathematical manipulation is used for performing correction compensation on reflected energy specific to a linear combined earthquake focus system, so that the contradiction between the spread rule of combined earthquake focus waves and an AVO technology assumed condition is eliminated. The AVO correction method is an effective means for increasing the combined excitation AVO analysis accuracy.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to an AVO correction method under the condition of combined seismic sources. technical background [0002] AVO analysis is a landmark technique of prestack inversion and has been playing an important role in seismic data interpretation since the 1980s. The prerequisite for the application of AVO technology is that the energy incident to the CRP surface element in all directions is the same. However, the combined source excitation technology widely used in seismic exploration field data acquisition makes the energy of seismic waves in each propagation direction in space to be different, which is contradictory to the assumptions of AVO technology. If the seismic data obtained by combined excitation are not processed for AVO analysis, it will inevitably lead to errors in the analysis results. In order to improve the AVO analysis accuracy of combined seismic sources, the reflected...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 徐峰陈祖银刘文革
Owner SOUTHWEST PETROLEUM UNIV
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