Kirchhoff积分法OBS数据地震波场延拓  

Extrapolating the OBS Data Using the Kirchhoff Integral Method

作　　者：王祥春[1] 王延峰 夏常亮[3] 刘学伟[1] 

机构地区：[1]地下信息探测技术与仪器教育部重点实验室(中国地质大学,北京),北京100083 [2]中国石油集团测井有限公司长庆事业部,陕西西安710201 [3]中国石油集团东方地球物理勘探有限责任公司研究院,河北涿州072750

出　　处：《现代地质》2012年第6期1231-1236,共6页Geoscience

基　　金：中央高校基本科研业务费专项资金资助项目(2011YYL135);国家"973"计划项目(2009CB219505);中国地质大学国际科技合作项目(2010DFA21630)

摘　　要：针对海底地震仪(OBS)数据基准面校正的特殊性,采用Kirchhoff积分法对中国南海实际OBS资料进行了基准面校正处理,将炮点延拓到OBS所在处的海底面上,取得了预期的效果。分析表明该延拓法对地震波场的分辨率及信噪比影响不大,且与静校正方法相比较,该方法能够得到地下地层较真实的速度场,这对于后续的动校正、叠加等常规处理十分重要。When the OBS（ocean bottom seismograph） technique is used to explore the Earth,the shots are on the sea surface and the receivers are on the sea floor,so the OBS data can＇t be processed in the conventional seismic data processing method.In order to solve this problem,the shots and OBS need correcting into the same surface.Here the Kirchhoff integration method is carried out to extrapolate the shots onto the sea bottom surface where the OBS lies on and ideal results are achieved.The Kirchhoff extrapolation processing used here causes little negative influence on the resolution and wave field＇s signal/noise ratio.In addition,more accurate velocity field is achieved by velocity analysis to the extrapolated data than to the static shift corrected data,and this is very important to the consecutive data processing such as NMO（normal moveout）,stack and so on.

关 键 词：海底地震仪 静校正 KIRCHHOFF积分法 

分 类 号：P631.4[天文地球—地质矿产勘探]