摘要
与常规叠后时间偏移相比,叠前时间偏移具有更高的成像精度、信噪比和更好的波组特征,特别在构造复杂、速度横向变化大的地区,叠前时间偏移的优势更为明显。基于各向异性叠前时间偏移,考虑了地层的非均质性和复杂地震射线的传播问题,提高了对复杂地质构造的成像精度。针对南黄海海相油气地震勘探中的成像难题和原始地震资料品质,通过处理攻关试验形成了以各向异性Kirchhoff叠前时间偏移技术为主体的成像处理流程和参数,改善勘探目标层的成像品质。
Compared to the conventional post-stack migration, the pre-stack time migration can enhance the accuracy of images,increase the ratio of signal to noise and make the wave group characleristics of seismic reflection zone clearer, especially in the areas with complicated structure and strong variation of lateral velocity. In This paper, we proposed a seismic imaging processing flowchart and parameters according to the method of anisotropic Kirchhoff pre-stack time migration, though there were prob lems in dealing with the available data in imaging and data quality. As the result, the quality of seis- mic trace gathers and sections and the imaging accuracy were obviously improved.
出处
《海洋地质前沿》
2013年第1期61-65,70,共6页
Marine Geology Frontiers
基金
国家自然科学基金(41174098)
国土资源部海洋油气资源与环境地质重点实验室基金(MRE201104)
国土资源部地质调查专项(GZH200800503
GZH201200509)
关键词
各向异性
叠前时间偏移
叠前噪音衰减
海相油气
南黄海
anisotropy
pre-stack time migration
pre-stack noise attenuation
marine hydrocarbon
South Yellow Sea
