海底电缆地震采集方案优化及关键处理技术——以北部湾盆地WS区为例  

Optimization design of seismic acquisition about ocean bottom cable and key processing technologies:a case study of WS area in Beibu Gulf basin

作　　者：袁全社 李列 张兴岩[2] 柴继堂 李林 王大为 

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057 [2]中海油能源发展股份有限公司工程技术分公司,广东湛江524057

出　　处：《中国海上油气》2015年第4期54-60,共7页China Offshore Oil and Gas

摘　　要：北部湾盆地WS区中深层流沙港组具有很大的勘探潜力,但利用现有地震资料进行精细构造解释和油藏描述非常困难,无法满足勘探和开发研究的要求。海底电缆地震采集和处理技术在改善中深层复杂构造成像方面优势明显,适用于复杂浅水区采集环境。针对WS区中深层勘探面临的复杂构造成像问题,提出了高密度宽方位海底电缆地震勘探技术应用思路,重新确定面元尺寸并优化观测系统,重点开展Z分量高保真噪声衰减、P-Z分量双检合并和宽方位控制射线束叠前深度偏移成像等3项关键处理技术研究。应用效果表明,WS区地震资料品质得到了明显改善,有效提高了地震解释研究的可靠性,促进了该区后续勘探研究。Great oil exploration potential exists in mid-deep Liushagang Formation at WS area in Beibu Gulf basin. However, it is difficult to implement fine structure interpretation and reservoir description based on the existing seismic data, which cannot reach the requirements of exploration and development research. Ocean bottom cable seismic acquisition and processing technology have obvious advantages in improving the complex structure imaging in mid-deep formation, and are suitable for complex shallow water environment. To solve the problem of complex structure imaging in mid-deep formation in WS area, high-density and broad azimuth ocean bottom cable seismic exploration technology were proposed, in which bin size was refined and observation pattern was optimized. Such three key processing methods as high-fidelity noise attenuation in Z component, P-Z dual-sensor summation and broad control beam-ray migration were discussed. Application results indicate that seismic data quality and reliabili- ty of seismic interpretation of WS area are remarkably improved, enhancing future exploration study.

关 键 词：海底电缆地震勘探技术 面元尺寸 观测系统 Z分量高保真噪音衰减 P-Z分量双检合并 宽方位控制射线束偏移 北部湾盆地 

分 类 号：P631.4[天文地球—地质矿产勘探]