Zero hypocentral distance vertical seismic section compressional-shear wave data depth field corridor stacked section processing method

Abstract

Geophysical exploration for oil wells, the source from the vertical seismic profile aspect wave data stack depth domain Corridor profile approach is the use of in situ collection of well spacing VSP data, which will all receive points drilling depth of information and hierarchical data with the depth of information, the use of direct wave VSP data travel through and optimization algorithms are highly accurate anti-layer velocity model, the direct wave to the beginning of the reflected wave in the vicinity of the depth and precision homing imaging, further in-depth domain Corridor section and with the superposition of alternative conventional method leveled in the time domain, with corridors and the superposition method, the results can be superimposed for direct comparison with the drilling and seismic data stratified layer identification. More intuitive, but also made full use of VSP data in the depth of information, make geological formation of the earthquake response and drilling, logging data in depth domain direct contrast, a more intuitive geological layer and the relationship between seismic horizon, thereby enabling layer of identification and calibration more reliable.

Description

technical field [0001] The present invention designs petroleum geological prospecting technology, which is a method for processing vertical seismic profile longitudinal and transverse wave data depth domain corridor superposition section processing method with zero well-source spacing for vertical seismic profile exploration. Background technique [0002] In vertical seismic profile (Vertical Seismic Profile, VSP for short) exploration technology, it is sometimes necessary to measure VSP data with zero well-source distance. The standard requires that the ratio of the distance from the wellhead to the depth of the observation point is less than 1 / 20. Since this value is very small, it is called zero well-source distance) using a seismic source (explosives, vibrators, air guns, etc.) to excite on the ground or at sea , drive the geophone in the well to record through the synchronous signal. The time domain zero-well-to-source spacing VSP data corridor superposition processing...

AI Technical Summary

Problems solved by technology

This method gives up the advantage of having accurate depth information and is easy to compare with drilling and logging data, so that the seismic response of the geological horizon cannot be directly compared with the drilling and logging information in the depth domain. The application is not intuitive and the comparison is less certain.

[0006] In the processing of zero-well-source VSP data in the time domain, it is usually necessary to make the processing datum of VSP data consistent with that of surface seismic data through correction. Due to the static correction problems caused by shallow velocity and filling velocity, it makes It is more difficult to compare and calibrate the time-domain corridor stacked section with drilling and logging data, and the result of this uncertainty will affect the reliability of seismic data interpretation

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