8L4S176T观测系统在渤海CF区块海底电缆地震采集中的应用
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摘要
为在渤海CF区块复杂过渡带获得高品质的地震采集资料,采用了8L4S176T观测系统,并在采集设备、震源选型、电缆铺设、二次定位等方面进行了详细论证;分析了采集作业过程中存在的施工效率低、潮流影响大、过往船只多等作业难点,提出了沿测线放炮、提前多铺设2根电缆、分时放炮、增加电缆配重、"圈地法"护缆等相应的技术措施,实施后取得了更丰富的波场信息,有效提高了地震资料分辨率,改善了该区块中深层复杂构造的成像精度。
In order to acquire excellent seismic data in the complex transitional zone of CF block,Bohai Sea,8L4S176T observation system was applied,and several technical issues were appraised in detail,including acquisition equipment,source selection,cable laying,secondary positioning,etc.For the operation difficulties,such as low efficiency,big impact of tidal current,and many passing ships,during seismic acquisition,a series of technical measures were developed,including shooting along the survey lines,laying two more cables in advance,shooting at different time,increasing the cable weight,protecting cables with "an enclosure method" and other appropriate measures.The adoption of these measures has resulted in acquiring more information of wave field,improving effectively resolution of seismic data and increasing accuracy in imaging deep complex structures of the block.
In order to acquire excellent seismic data in the complex transitional zone of CF block,Bohai Sea,8L4S176T observation system was applied,and several technical issues were appraised in detail,including acquisition equipment,source selection,cable laying,secondary positioning,etc.For the operation difficulties,such as low efficiency,big impact of tidal current,and many passing ships,during seismic acquisition,a series of technical measures were developed,including shooting along the survey lines,laying two more cables in advance,shooting at different time,increasing the cable weight,protecting cables with "an enclosure method" and other appropriate measures.The adoption of these measures has resulted in acquiring more information of wave field,improving effectively resolution of seismic data and increasing accuracy in imaging deep complex structures of the block.
引文
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[3]侯成福,蒋连斌,高书琴.三维观测系统与采集脚印[J].石油地球物理勘探,2007,42(6):611-615.
[4]周滨,刘长镇,高祁,等.海上浅水区地震资料采集方法研究[J].中国海上油气,2007,19(2):90-92.
[5]周建新,姚姚.双检波器压制海上鸣震[J].中国海上油气(地质),1999,11(6):359-362.
[6]王云峰.高分辨率空气枪阵列及子波研究[J].中国海上油气(地质),1996,8(6):395-401.
[7]姜瑞林.海底电缆地震采集系统——初至波二次定位成果的质量评价[J].石油地球物理勘探,1992,34(6):670-674,689.
[8]姜瑞林.海底电缆声波二次定位成果的质量分析[J].石油仪器,1996,5(10):23-25.
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