Deep dragging type high-resolution multichannel seismic data fine processing method

Abstract

The invention relates to the technical field of ocean geophysical exploration, in particular to a deep-towed high-resolution multichannel seismic data fine processing method, which comprises the following steps: placing a deep-towed seismic source and each detection point on a floating reference surface, acquiring floating reference surface correction values of multichannel seismic data, and performing floating reference surface correction on a CMP (chemical mechanical polishing) gather; performing dynamic correction on the CMP gather, obtaining residual time difference in the CMP gather after dynamic correction, and performing residual time difference correction on the CMP gather; calculating self-excitation and self-receiving time difference according to the travel time of the seabed reflected waves after the residual time difference correction in the CMP gather and the corresponding self-excitation and self-receiving time, and performing self-excitation and self-receiving time difference correction; performing non-consistency time difference correction on the CMP gather after self-excitation and self-receiving time difference correction by using a phase substitution method; and performing seabed smooth time difference correction on the stacked section after the non-consistency time difference correction. According to the method, various time differences can be fully eliminated, and high-resolution, high-signal-to-noise-ratio and high-fidelity imaging of the formation structure form below the seabed is achieved.

Description

technical field [0001] The invention relates to the technical field of marine geophysical exploration, in particular to a deep towing type high-resolution multi-channel seismic data fine processing method, which is applied to the data processing link of a deep towing type high-resolution multi-channel seismic detection system to obtain high-quality The deep-drag high-resolution multi-channel seismic imaging section. Background technique [0002] The detection method of sea surface dragging is affected by the deep water body. The Fresnel zone of the target formation is very large and the high frequency energy of the source is greatly attenuated, so it is difficult to achieve high resolution in the true sense. In the prior art, a deep tow high-resolution multi-channel seismic detection method is adopted, in which a high dominant frequency deep tow source (dominant frequency of about 750 Hz) and a multi-channel detection point array (48 channels) are simultaneously towed to a d...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the prior art, the present invention provides a fine processing method for deep-drag high-resolution multi-channel seismic data, which can solve the problem of tow-trajectory and deep-drag seismic source-detection in the deep-drag high-resolution multi-channel seismic detection system. Improve the signal-to-noise ratio and resolution of the deep-drag high-resolution multi-channel seismic imaging section, so that it can provide more detailed details of seabed sedimentation and structure

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