南黄海中古生代残留沉积地层的地震成像  

Study on seismic imaging of residual Paleozoic sediment stratum in South Yellow Sea

作　　者：张宝金[1] 成谷[2] 文鹏飞[1] 符溪[1] 王真理[3] 

机构地区：[1]国土资源部广州海洋地质调查局,广州510760 [2]中山大学地球科学系,广州510275 [3]中科院地质与地球物理研究所,北京100029

出　　处：《地球物理学进展》2010年第2期389-395,共7页Progress in Geophysics

基　　金：国家高技术研究发展(863)计划项目(2006AA09Z359);广东省博士科研启动基金资助项目(32110 4203205)资助

摘　　要：文中展示了南黄海中古生代沉积地层的成像结果,显示南黄海隆起区存在较稳定的中古生代沉积地层残留区.南黄海中古生代残留沉积地层的成像问题一直是地震资料处理的难点,主要原因是以海底鸣震为主的层间多次波和与中古生界顶界面相关的长程多次波非常发育,致使有效反射波无法准确识别.本文利用平面波域层间多次波的可预测性,对地震数据平面波分解之后进行预测反褶积,较好地消除了层间多次波.利用速度差异分离长程多次波,在有效波速度无法确定的条件下,先从低速的、可以确认的多次波开始进行分离,逐步确认并分离多次波,同时逐步进行有效波的确认和成像速度的尝试,最终得到合适的成像速度场和多次波被充分分离的数据.成像结果对南黄海残留盆地研究有一定借鉴意义.The paper shows the imaging result of Paleozoic sediment stratum in the South Yellow sea.The result shows that there exists relative stable residual Paleozoie sediment stratum in the upheaval zone of South Yellow Sea.Due to the existence of interval multiples and long-way multiples,the seismic imaging is very difficult in residual Paleozoie sediment stratum in the South Yellow Sea.In this paper,the data is transformed to plane-wave domain firstly,and then the prediction deconvolution is applied to attenuate the interval multiples.The velocity difference between the multiples and the effective waves are used to attenuate the long-way multiples.First the multiples with lower velocities and distinguish from the effective waves are seperated,and then seperates the multiples with higher velocities,the imaging velocity and the effective waves are re-determined during the iterative process,until all longway multiples are attenuated and suitable imaging velocity are obtained.The imaging result is meaningful to the residual basin research.

关 键 词：南黄海 残留盆地 中古生界 海底鸣震 多次波 

分 类 号：P315[天文地球—地震学] P738[天文地球—固体地球物理学]