High accuracy depth domain prestack earthquake data inversion method

A pre-stack seismic and data inversion technology, applied in the field of geophysical exploration, can solve problems such as incomplete convergence of diffracted waves, event distortion, event waveform distortion, etc.

Inactive Publication Date: 2008-01-16
BGP OF CHINA NAT GASOLINEEUM CORP
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Problems solved by technology

First of all, the NMO processing in conventional processing tends to distort the waveform of the event (mainly waveform deformation), and the distortion of the event at a far offset is also the most serious
Therefore, waveform distortion becomes the biggest problem in conventional AVO inversion
Secondly, NMO processing will also move the processed waveform to low frequency (mainly caused by waveform stretching), and in areas with relatively c...

Method used

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  • High accuracy depth domain prestack earthquake data inversion method
  • High accuracy depth domain prestack earthquake data inversion method
  • High accuracy depth domain prestack earthquake data inversion method

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specific Embodiment approach

[0040] Single-shot records obtained through conventional field seismic data acquisition;

[0041] According to the pre-stack shot data within the imaging aperture, the focus operator of each imaging point is obtained through ray tracing or wave field continuation operators from the focal point to each receiver point (as shown in Figure 1(a));

[0042] Use the obtained focusing operator to perform convolution with the single shot record in the offset aperture to obtain the focus point shot gather corresponding to each shot;

[0043] The focal point shot gathers generated in the previous step are superimposed in time to generate the confocal point gather corresponding to the reverse time focusing operator, that is, the CFP gather (as shown in Figure 1(b)). Two-step focusing is used to obtain grid point gathers whose reflection amplitude varies with incident angle.

[0044] Perform two-dimensional full cross-correlation between the reverse-time focusing operator and the confocal...

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Abstract

The invention relates to a pre stack seismic data inversion method of globe physical exploration high accuracy depth domain, which has the following steps: single shot records are collected; according to pre stack shot gather data and through radial line track or wave-field continuation focus, wave-field continuation focusing operators of all detecting wave points are pointed to and the focusing operator of each imaging point is obtained; the focusing operator and the single shot record are implemented in a migration aperture, and focus point shot gather corresponding to each shot is obtained; the focusing operator and common focus point gather are implemented cross correlation operation in time domain and space domain at the same time, and net point gather is obtained; the net point gather is implemented Radon transform, and CFP-AVP gather of corresponding imaging point is obtained; each imaging point gather is stacked, and the whole 2D document pre stack high accuracy analysis sectional plane is obtained. The CFP-AVP analysis in the invention has the advantages of wide application condition, reliable analysis sectional plane and sound effect of supercritical information inversion.

Description

technical field [0001] The invention relates to geophysical exploration technology, in particular to a high-precision depth-domain pre-stack seismic data inversion method under the premise of not reducing imaging quality in reflection wave seismic exploration. Background technique [0002] In reflection wave seismic exploration, the reflection information (seismic record) from underground geological bodies is obtained by exciting the ground explosive source, vibrator or heavy hammer source. For these reflection information, a series of seismic data processing is required. Including static correction, dynamic correction, stacking and migration, etc., and then obtain the imaging section for geological interpretation, including stacking section and migration section, stacking velocity field and layer velocity field, etc., which are predicted by the joint interpretation of geological personnel Where there may be oil and gas. However, the stacking and migration profiles are the ...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 张建磊
Owner BGP OF CHINA NAT GASOLINEEUM CORP
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