论文详情
由于地下照明范围有限,断层及盐丘侧翼等高陡构造准确成像一直是地震处理中的难点。以陡倾角构造产生的棱柱波信息为研究对象,推导了具有明确物理含义且不含一次波的棱柱波逆时偏移成像算子,并引入Poynting成像条件及平面波解构算子对成像方法进行优化。在编程实现优化算法的基础上,对倒T模型和复杂丘体边界模型进行了试算,结果表明:棱柱波逆时偏移算法降低了对初始速度模型的依赖,高陡构造成像清晰,压制偏移噪声的效果较好。
Traditional seismic data processing technique has some difficulties in imaging high-steep structures,such as faults and salt-dome flank and so on,due to its limited geometry distribution.Different from the traditional reflection-based migration method,we derive the prism wave reverse time migration operator with the clear physical meaning by considering the prism wave phases as the useful information.In addition,the Poynting imaging principle and plane-wave deconstruction filter operator are introduced to improve the imaging resolution.The empirical results with two typical models suggest that the prism wave reverse time migration approach can get a clear image of the high-steep structure with better migration noise suppression as well as the independence on the accuracy of the initial migration velocity model.
国家重点基础研究发展计划(973计划)(2014CB239006),国家自然科学基金(41274124)和国家科技重大专项(2016ZX05014001,2016ZX05002)联合资助。