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Method for calculating shot-static correction for two-dimensional vertical seismic section data

A vertical seismic profile and data calculation technology, applied in the field of geophysical exploration, can solve the problems that cannot meet the technical requirements of two-dimensional vertical seismic profile, the depth of the receiving point is shallow, and the distance between near-surface survey points and shot points is large.

Active Publication Date: 2009-12-09
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

However, there are two problems: one is that the depth corresponding to the data obtained from the near-surface survey is much shallower than the receiving point depth of the 2D vertical seismic profile; It is much larger, and it is impossible to have accurate investigation results for every shot point
This leads to the fact that the method of calculating shot point static correction for near-surface investigation cannot meet the needs of two-dimensional vertical seismic section technology
2D vertical seismic section technology has no suitable shot point static correction technique to improve the processing quality of 2D vertical seismic section

Method used

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  • Method for calculating shot-static correction for two-dimensional vertical seismic section data
  • Method for calculating shot-static correction for two-dimensional vertical seismic section data
  • Method for calculating shot-static correction for two-dimensional vertical seismic section data

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Embodiment Construction

[0030] In the field, a mechanical vibrator is used to artificially excite seismic waves on the well-passing shot line designed on the ground, and a three-component seismic wave train receiver is placed in the well to receive the seismic wave field signal, and then the cable is transmitted to the ground recording instrument to record the three-component vertical seismic profile seismic wave field , to obtain the zero well-source spacing vertical seismic section and the two-dimensional vertical seismic section data respectively;

[0031] For the vertical component of the original seismic data of the three-component vertical seismic profile with zero well-source spacing ( figure 1 ) to pick up the first arrival, and obtain the first arrival time T i , use the formula (1) to obtain the layer velocity of each downhole observation point, and then perform geological stratification on the layer velocity to obtain the layer velocity model;

[0032] The conventional three-component geo...

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Abstract

The invention relates to a method for calculating shot-static correction for two-dimensional vertical seismic section data in geophysical exploration. The method comprises the following steps: carrying out first arrival picking on zero-offset vertical seismic section data to obtain an interval velocity at the depth of an observation point; picking the direct wave first arrival of a longitudinal wave of the two-dimensional vertical seismic section; carrying out three-component polarimetric analysis on the original data of the two-dimensional vertical seismic section; carrying out rotation processing; back calculating the static correction amount of each shot of the two-dimensional vertical seismic section data; and moving the amplitude of each track of seismic data points to finish the static correction. The invention does not need field near-surface investigation, overcomes the defects that the field investigated points are sparse, the obtained static correction is not precise enough, and the investigated depth is shallower of the field near-surface investigation method and improves the processing quality of the vertical seismic section.

Description

technical field [0001] The invention relates to geophysical prospecting technology, in particular to a method for calculating static correction of shot points from two-dimensional vertical seismic profile data. Background technique [0002] Conventional vertical seismic profile (the method of vertical seismic profile that is excited along the designed one or more shot lines passing through the well and recorded by the geophone in the well, also known as walkaway VSP, or WVSP for short) data is collected at a single point on the ground. In order to expand the coverage of vertical seismic profile data and increase the number of coverage times, the two-dimensional vertical seismic profile (WVSP) technology is designed. The continuous multi-point excitation on the line, and the seismic data received at multi-point downhole. During data acquisition of two-dimensional vertical seismic profiles, due to differences in the surface fluctuations and underground geological structures a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/36
Inventor 耿伟峰侯爱源
Owner BC P INC CHINA NAT PETROLEUM CORP
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