Analysis of influence of cable-source spatial combination on excitation wavelet behavior in seismic acquisition of shallow sea
The low resolution of seismic data is a prominent problem in the current deep seismic exploration in Bohai Sea.In order to solve this problem,it is necessary to find breakthroughs in seismic acquisition,especially in the source design.However,there are few reports on the research of spatial combination of the streamer and source in shal-low water conditions of Bohai Sea.This paper firstly analyzes the characteristics of air gun pulse propagation in shal-low water conditions of Bohai Sea and determines the main factors affecting the air gun pulse propagation.Then,the paper simulates the single gun wavelet in shallow water based on the non-ideal gas condition air gun wavelet model,studied the spectral characteristics of the wavelet by considering the streamer ghost,and proposes the method of evaluating the source performance with the wavelet including streamer ghost.Secondly,based on the actual geo-graphical and geological conditions in Bozhong area of Bohai Sea,the paper designs the simulation tests of different cable-source sinking depth combinations and source plane distribution and analyzes systematically the influence law of spatial combination of the streamer and source on wavelet and its frequency spectrum under the condition of shal-low water in Bohai Sea.Finally,the paper applies the summarized law understanding and source design technology to the secondary data acquisition of Bozhong and compares the new and old three-dimensional towing cable single shot in Bozhong area,which verifies the correctness of the proposed method.The research results have a certain guiding significance for the optimal design and evaluation of air gun sources in the shallow water area of Bohai Sea.
shallow waterair gun waveletstreamer depthsource depthsource plane distribution
国家科技期刊平台
NSTL
万方数据
