OBN资料平面波域波场延拓基准面校正方法研究  

3D plane-wave datuming of OBN data

作　　者：焦叙明[1] 张明强[1] 王炜 谢涛[1] 王艳冬 公绪飞 JIAO Xu-ming;ZHANG Ming-qiang;WANG Wei;XIE Tao;WANG Yan-dong;GONG Xu-fei(Geophysical Research Institute,Geophysical-COSL,Tianjin 300451,China;CNOOC Research Institute,Beijing 100028,China;Shandong University of Science and Technology,Shandong 266590,China)

机构地区：[1]中海油田服务股份有限公司物探事业部物探研究院,天津300451 [2]中海油研究总院有限责任公司,北京100028 [3]山东科技大学,青岛266590

出　　处：《地球物理学进展》2020年第6期2351-2358,共8页Progress in Geophysics

基　　金：中海油田服务股份有限公司科研项目(E-23192002)资助。

摘　　要：海底节点(OBN)采集技术因其在宽方位、超长偏移距、宽频及时移地震检测等方面的优势获得业界青睐,但其特有的采集方式也给后续资料处理带来不小挑战.特别对于深水探区,炮点通常位于海面以下几米而检波点位于海底所造成的高程差使得比如动校正和速度分析等常规基于单一海平面作为基准面的许多成熟处理技术无法直接应用.为尽可能消除该影响,本文提出在海底及地下构造较平缓情形下将OBN共检波点道集经上下行波分离的上行波资料在平面波域延拓至海平面的方法.该方法首先将共检波点道集经上下行波分离的上行波分解成不同入射角的单频平面波,然后根据OBN节点沉放深度信息将不同入射角的单频平面波延拓至海平面得到炮检点位于同一基准面的上行波资料.理论模型和实际资料的测试结果证明了该方法在海底和地下构造较平缓情形下可行性和高效性.Ocean Bottom Node(OBN) acquisition is getting more attention due to its characteristics of wide-azimuth, long offset, broadband and 4 D seismic monitoring. Especially for the deep water case, the common processing techniques based on the sea surface as the datum can’t be directly used. In order to overcome the elevation difference between the source and receiver, we propose to continue the up-going wavefield of common receiver gather to the sea surface in the plane wave domain under the condition that the seabed and subsurface structure are relatively flat. The separated up-going records in the common receiver domain are first transformed into single frequency plane waves. Then the decomposed plane waves are continued to the sea surface with their own incident angle. The application results on theoretical model and field data show that this method can continue the separated up-going wave of OBN data from the water bottom to the sea surface with acceptable precision and high efficiency.

关 键 词：海底节点 基准面校正 平面波域 波场延拓 Τ-P变换 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]