HIGH PRECISION GAUSSIAN BEAM PRE-STACK DEPTH MIGRATION FOR YINGGEHAI BASIN 2D SEISMIC PROFILES

A high-precision imaging method is critical to oil and gas exploration in the South China Sea. A high precision imaging method with Gaussian beam pre-stack depth migration is proposed in this paper. Marine seismic records are firstly processed with local slant stack, then ray tracing is made from the source to the receivers respectively. Gaussian beam superposition is used for imaging. Through programming and Gaussian beam migration testing based on the typical model of the Yinggehai basin in the South China Sea, we analyzed the local amplification and angle domain common imaging gathers(ADCIGs). Results show that the method can image the seabed with steep faults and rock mass accurately and verify its adaptability to the complex ocean model.