摘要
柬埔寨北部A区块地表情况复杂(既有丘陵,又有雷区),即使实施弯线采集,由于干扰波发育,静校正问题突出,信噪比极低。采用常规处理方法处理后的叠加剖面仍不能满足地质解释的需求。为此,本文开展了针对性的处理方法研究。针对弯线剖面位置偏离地下实际反射点位置,利用GeoEast系统提供的弯线观测系统定义模块进行了道头更新,确保CMP点的走向与测线走向基本吻合;联合应用多种去噪方法,在叠前道集和叠后剖面上进行多域适度去噪处理,提高资料的信噪比;针对复杂静校正问题,采用浮动面处理,联合应用多种静校正方法解决长、中、短波长静校正问题;针对弯线偏移归位问题,采用GeoEast系统的弯线偏移模块,保证地下构造精确成像。采取以上措施,资料的信噪比得到了大幅度提高,基本满足地质解释的需要。
A 2Dcrooked-line seismic survey was carried out in the Block A,north Cambodia because of hills and landmines.The main challenges of data processing are strong noise,serious statics,and extremely low signal-to-noise ratio due to these complex surface conditions in the area,which cannot be solved by conventional methods.Based on techniques provided by GeoEast,we first update record headers by crooked-line geometry module toensure CMP trend consistent with seismic lines.Then we perform noise-removals both on prestack and poststack by joint use of several methods in multi-domains to improve signal-to-noise ratio.After that,we use floating datum combined with a few approaches to solve long,middle,and short wavelength static problems.Finally we adopt the peculiar crooked-line migration module provided by GeoEast to ensure accurate underground structure imaging.Applications of the processing show that both signal-to-noise ratio and data imaging have been significantly improved.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2014年第A01期48-54,2-3,共7页
Oil Geophysical Prospecting
关键词
弯线
联合多域去噪
复杂静校正
弯线偏移
crooked-line,noise removal in multi-domains,complex static corrections,crooked-line migration
