Characteristic wave inversion imaging and solutions of seismological geological problems in Chinese typical exploration areas

摘要

The aim of oil-gas seismic exploration is on locating, identifying, depicting, and evaluating oil and gas reservoirs. Chinese typical surface and underground geological conditions determine a different technical route for seismic exploration. In the exploration areas like complex mountain front exploration area, the sea-land transitional zone and shallow sea of Bohai Bay, the complicated fault-block reservoirs in Jiyang Depression, the thin interbed reservoirs in Songliao Basin and carbonate cave reservoir in Tarim Basin, we need corresponding seismic data acquisition and seismic imaging techniques. Represented by characteristic wave imaging method and technique framework, we developed a relatively completed inversion imaging technical system, which includes data preprocessing techniques based on compressive sensing, Monta Carlo initial background velocity modeling technique using non-horizontal field surface Kirchhoff integral as PSDM engine, transmitted and reflected wave tomography under wave theory based on travel-time (phase), LS-PSDM technique and fidelity ADCIGs generation technique in TTI/Q medium. With the techniques above combined with wide azimuth, wide broadband, and high density seismic data acquisition techniques, we can assemble the corresponding solutions aiming at different geological feature of different exploration areas. Large amount of cases have proven the validity of the proposed scheme.