OBS and sea surface towrope seismic data combined imaging method and processing terminal

Abstract

The invention relates to an OBS and sea surface towrope seismic data combined imaging method and a processing terminal. The method comprises the following steps: 1, acquiring original OBS data and MCSdata; 2, preprocessing the MCS data, and extracting seismic wavelets and a migration velocity model; 3, preprocessing the OBS data; 4, performing wave field separation on the preprocessed OBS data toobtain an uplink wave of the OBS data; and 5, obtaining a joint imaging result according to the preprocessed MCS data, the uplink wave, the seismic wavelet and the migration velocity model. Accordingto the method, the uplink waves of the OBS data are fully utilized, the uplink waves accord with the wave equation, the imaging method based on the wave equation can be used for obtaining the combined imaging result, calculation is more convenient, and the obtained imaging result is better in effect.

Description

technical field [0001] The invention relates to the technical field of seismic data imaging, in particular to a joint imaging method of OBS and sea surface streamer seismic data and a processing terminal. Background technique [0002] The submarine seismograph (OBS) is widely used in the investigation of marine hydrates and marine lithosphere structures. In order to obtain as much information as possible, in actual operation, the submarine seismograph is generally collected synchronously with the sea surface tow, and the sea surface tow cable collects multiple channels. Seismic data, the data collected by submarine seismographs are called OBS data, and the multi-channel seismic data collected by sea surface streamers are called MCS data. Both methods of collecting data have advantages and disadvantages. The OBS layout is relatively sparse. The biggest disadvantage of OBS data is that it is relatively scarce, but the offset of OBS data is relatively large, which contains ric...

AI Technical Summary

Problems solved by technology

This processing mainly has the following defects: (1) Although OBS and MCS have complementary advantages, the advantages of both have not been well utilized in imaging processing; (2) less use of the uplink wave in OBS data wastes data and does not Reuse of collected data results in underutilization of collection resources and poor imaging results

In addition, this technical solution does not consider the classification of upgoing waves and downgoing waves in OBS data, and it is easy to introduce artifacts into the velocity model, which will eventually affect the imaging effect

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