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中文摘要：
南海油气资源丰富，随着勘探区域逐渐由陆地转向海洋，高精度成像是海洋油气勘探的瓶颈技术。本文发展了一种高斯束高精度叠前深度偏移方法，将海上接收的地震记录进行加窗局部倾斜叠加，从震源和检波点分别进行射线追踪，利用高斯束叠加求和的方法进行成像。通过对南海莺歌海盆地典型模型进行成像测试，结合偏移成像结果局部放大及角度域共成像点道集进行分析，验证了本文方法对海底陡倾角断层及岩体高精度成像能力及其对海洋复杂模型良好的适应性。
英文摘要：
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.
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