南海北部陆坡区多次波发育特征及压制策略分析  

Characteristics of multiples in the slope of the northern South China Seaand the suppressing method

作　　者：刘伊克[1] 朱伟林[2] 米立军[2] 周家雄 谢宋雷[4] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国海洋石油总公司,北京100010 [3]中海石油(中国)有限公司湛江分公司,湛江524057 [4]中国科学院南海海洋研究所,中国科学院边缘海地质重点实验室,广州510301

出　　处：《地球物理学报》2014年第10期3354-3362,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(41374138和41430321);国家油气专项(2011ZX05008-006)联合资助

摘　　要：南海北部陆坡坡折带和常规海上地震勘探观测系统的制约,再加上南海北部陆坡区复杂的海底地层构造,导致南海北部陆坡区地震勘探成像结果不够理想.究其主要原因是多次波发育复杂、遮挡了一次波能量,也就直接影响到一次波的成像效果,从而制约了对陆坡区更深入的油气勘探.本文结合南海北部陆坡区的构造特征,依据多次波的产生机理分析多次波的发育分布状况,得出单一的地球物理方法已经不能较好的解决南海北部陆坡区的多次波压制问题.针对该区域复杂的地质背景,在综合运用多种地球物理方法的基础上,严格依照多区域、多尺度的理念,提出一套适应南海北部陆坡区多次波压制的系统策略.经过实际资料检验,有效的压制南海北部陆坡区的多次波干扰,最大程度的突出一次波成像,为南海北部进一步的油气勘探夯实基础.Because of the limitationsin the slope of the northern South China Sea and seismic exploration geometry,the image quality of complex strata in this region is not satisfactory.The main reason for this problem can be summarized as multiples covering primary waves,which affects imaging results.In this work,we considered the structural features of the slope of the northern South China Sea,according to the multiple generation mechanism,analyzed the distribution of multiples in the South China Sea,and found that single geophysics methods cannot eliminate the multiples in this region.In this case,comprehensive uses of various geophysical methods which include multi-zone and multi-scale concepts have been applied to multiplesuppression,yielding a new multiple suppression approach suitable for this region.The tests on the model and field data demonstrate that this new strategy is able to achieve a better multiple suppression,and to lay a solid foundation for oil and gas exploration in the northern South China Sea.

关 键 词：南海北部陆坡区 多区域 多尺度 多次波压制 

分 类 号：P631[天文地球—地质矿产勘探]