Seismic imaging technology research in volcanic strong shielding area of Qionghai X area
Neogene strata in Qionghai uplift of Wenchang B depression have developed large area of volcanoes in Qionghai X area.Because of the strong shielding effect of volcanic rock on seismic signals,the underlying strata have low SNR and poor fault and stratum imaging,so the existing seismic can not meet the needs of geological research and trap implementation.In order to solve the seismic imaging problem in volcanic shielding area,three key technologies are adopted in this paper:①adaptive ghost wave suppression of sparse Tau-P inversion;② multi-model joint matching and multiple wave suppression technology in curved wave domain;③velocity percentage scanning tomography technology.Through the application of the above technologies,the SNR of the underlying strata in the igneous rock shielding area of Qionghai X area is effectively improved,and the imaging of strata,strata contact relationship and fault is greatly improved.It provides reliable seismic data for exploration and evaluation in the target area,and also provides important technical reference for seismic imaging processing in other areas with similar geological conditions that have low SNR problems.
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