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浅水区海底电缆地震数据水层多次波压制技术及应用

石油物探

2016年 55卷第No. 6期

阅读：90

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Title

Water layer multiple attenuation technique for OBC seismic data in shallow water area and its application

单位

(1.中国矿业大学,江苏徐州221116;2.中海油能源发展股份有限公司工程技术分公司物探技术研究所,广东湛江524057;3.中海石油(中国)有限公司湛江分公司,广东湛江524057)

Organization

(1.China University of Mining and Technology,Xuzhou 221116,China;2.Development & Prospecting Geophysical Institute,CNOOC EnerTech-Drilling & Production Co.,Zhanjiang 524057,China;3.Zhanjiang Branch,CNOOC Ltd.,Zhanjiang 524057,China)

摘要

水层多次波是海底电缆(OBC)地震数据中发育最多、能量最强的多次波,尤其是在水深小于100 m的浅水区,其对数据品质影响很大。提出了一种浅水区OBC地震数据水层多次波压制技术,该技术使用水体模型驱动,在τ-p域进行波场延拓,模拟出OBC地震数据的水层多次波模型,然后采用多道均衡匹配滤波技术对多次波模型和地震数据进行匹配,最后从地震数据中减掉多次波。分别使用理论模型和实际OBC地震数据进行验证,结果证明该技术能有效压制浅水区OBC地震数据水层多次波,提高OBC地震数据的品质。

Abstract

Water layer multiples develop most and energy strongest in ocean bottom cable (OBC) seismic data,especially in the shallow water area with water depth less than 100 m.We proposed a method of ocean bottom cable shallow water de-multiple to suppress the water layer multiples of OBC seismic data in shallow water areas.The method is water layer model-driven,which uses the wavefield continuation in τ-p domain to build an initial multiple model of water layer multiples of OBC seismic data firstly.Then the multi-channel equalization matched filtering technique is applied to match the multiple model and seismic data.Finally,the multiple is removed from OBC seismic data.The application results on model data and real data show that our technique can effectively suppress water layer multiples for OBC seismic data in shallow water areas,and improve the quality of OBC seismic data.

关键词：

海底电缆; 水层多次波; 浅水区; 水体模型; τ -p域;

Keywords:

ocean bottom cable (OBC),; water layer multiple,; shallow water area,; water model,; τ-p domain;

基金项目

中央高校基本科研业务费专项资金(2015XKMS036)和中海油总公司科研项目(CNOOC-KJ125ZDXM06LTDNFCJF2012-01)共同资助。

DOI

10.3969/j.issn.1000-1441.2016.06.006