A delayed excitation method of marine air gun stereo subarray

Abstract

The invention discloses a marine air gun three-dimensional sub-array delay exciting method. Hanging points of air guns in a sub-array are provided with at least two different sinking depths, and the air guns at the positions of the hanging points at the different sinking depths form the three-dimensional sub-array. Exciting time of the air guns at the different sinking depths is different. By the adoption of the method, when a receiving method is determined, the three-dimensional sub-array can obtain low-frequency, sufficient and wide-frequency-band seismic data through the method of changing seismic exciting methods, the requirements for original quality of the seismic data from shallow zone exploration, medium zone exploration and deep zone exploration are met, and exploration cost is saved.

Description

technical field [0001] The invention relates to the technical field of marine seismic exploration, in particular to a delayed excitation method of a marine air gun stereo sub-array. Background technique [0002] With the continuous deepening of offshore oil and gas exploration and development, the geological research objectives are becoming more and more complex. The traditional conventional seismic exploration methods can no longer meet the increasing accuracy requirements of geological research, especially in the determination of lithological traps and the depiction of low-amplitude structures. On the one hand, it poses new challenges to marine seismic exploration technology. [0003] At present, the seismic acquisition of marine seismic exploration is mainly divided into two aspects: excitation and reception. In terms of stimulation, such as figure 1 As shown, all air guns and their sub-arrays in the traditional air gun array are arranged in the same plane (a plane para...

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Problems solved by technology

[0004] However, there are the following defects or deficiencies in the prior art: the traditional plane source sub-array, under the condition of constant excitation energy, when the depth of the source sub-array is shallow, the frequency band moves to the high-frequency band, and the low-frequency end frequency is relatively missing. The seismic wave penetration ability is poor, which is not conducive to the exploration of the middle and deep layers; when the subsidence depth is deep, the frequency band moves to the low frequency band, and the frequency band is relatively narrow, but it lacks high frequency components, which is not conducive to improving the resolution in shallow layers

To sum up, it is difficult to obtain raw seismic data with sufficient low frequency and wide frequency band by using the existing marine air gun subarray excitation method.

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