提高浅海OBC地震资料采集作业放缆点位精确度的理论计算方法
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摘要
海底电缆地震资料采集过程中放缆的点位精度难以把握。在全面考虑影响海底电缆地震资料采集放缆过程的海水潮流、电缆下水后惯性、放缆力度不均匀等诸多因素的情况下,基于电缆下水后力学和运动学规律,对电缆进行受力分析和运动学分析,建立了一套较为完整的提高浅海OBC地震资料采集作业放缆点位精确度的理论计算方法,采用该方法可以较好地计算出浅海OBC地震资料采集作业时纵向和横向上电缆下水前抛点的预留长度,为电缆的抛点位置选择提供了理论依据。根据此算法可以建立工区放缆数据库,科学地指导实际放缆作业,从而大大提高放缆点位精确度,面元覆盖次数更为均匀,改善资料品质,整体上提高作业效率,降低勘探周期和勘探风险。
It is difficult to control the precision of deploying the cable at the accurate point in the Ocean Bottom Cable(OBC)seismic data acquisition.Considering all the aspects of influencing factors,such as tidal current,inertia of cable into water and uneven cable deployment strength,we carried out mechanical analysis and kinematics analysis on the cable after deployed into the water,and proposed a theoretical calculation methods to improve the positioning precision of cable deployment in OBC seismic data acquisition.The new method can well calculate the reservation length of throwing point in longitudinal and transverse direction,which provides data criteria for selecting throwing point of cables.By applying the method,we can establish cable-laying database of the work area to scientifically guide actual operation,which can increase the precision of cable deployment, obtain more even fold and improve the quality of seismic data.So the operation efficiency can be enhanced,and the exploration period and risk can be reduced.
It is difficult to control the precision of deploying the cable at the accurate point in the Ocean Bottom Cable(OBC)seismic data acquisition.Considering all the aspects of influencing factors,such as tidal current,inertia of cable into water and uneven cable deployment strength,we carried out mechanical analysis and kinematics analysis on the cable after deployed into the water,and proposed a theoretical calculation methods to improve the positioning precision of cable deployment in OBC seismic data acquisition.The new method can well calculate the reservation length of throwing point in longitudinal and transverse direction,which provides data criteria for selecting throwing point of cables.By applying the method,we can establish cable-laying database of the work area to scientifically guide actual operation,which can increase the precision of cable deployment, obtain more even fold and improve the quality of seismic data.So the operation efficiency can be enhanced,and the exploration period and risk can be reduced.
引文
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[2]周刚,田坤,易缘峰.浅海煤田地震勘探采集技术研究及应用效果[J].科技咨询,2010(10):100
[3]杨志国,张建峰,高祁,等.空气枪震源子阵间距变化的形成与影响[J].勘探地球物理进展,2010,33(2): 93-98
[4]熊翥.21世纪初中期油气地球物理技术展望[M].北京:石油工业出版社,2006:118
[5]杜清怀,胡立新,张栋,等.声波测距定位系统在浅海地震采集作业中的应用[J].中国海上油气,2004,18 (6):17-20
[6]吕公河,张光德,尚应军,等.胜利油田高精度三维地震采集技术实践与认识[J].石油物探,2010,49(6): 562-572
[7]凌云,郭向宇,高军,等.油藏地球物理面临的技术挑战与发展方向[J].石油物探,2010,49(4):319-335
[8]黄中玉,曲寿利,王于静,等.三维多分量地震资料处理技术研究[J].石油物探,2010,49(2):140-146
[9]许建明,徐海,蒋连斌,等.基于最小偏移距分选的地震数据采集质量监控新方法——以沙特Berri工区三维项目为例[J].石油物探,2010,49(2):203-208
[10]林闻,周金应.世界深水油气勘探新进展与南海北部深水油气勘探[J].石油物探,2009,48(6):601-605
[11]徐维秀,段卫星,刘治红,等.提高初至波二次定位精度技术的探讨[J].石油物探,2009,48(3):239-243
[12]沈金松,孙文博.二维海底地层可控源海洋电磁响应的数值模拟[J].石油物探,2009,48(2):187-194
[13]谢月芳.平湖油气田放鹤亭构造平湖组储层精细反演[J].石油物探,2008,47(6):588-592
[14]蓝加达.可控震源非线性扫描在高分辨率地震采集中的应用[J].石油物探,2008,47(2):208-211
[15]谭胜章,杜惠平,宋国良,等.高精度三维地震资料采集技术——以官渡地区山地地震勘探为例[J].石油物探,2007,46(1):74-80
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