海底电缆地震技术优势及在中国近海的应用效果
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摘要
海上拖缆地震采集方式存在地震检波点位置不准、检波点鬼波对高频的陷波作用及三维地震是窄方位数据采集等问题,导致地震数据精度下降。而中国近海油气富集区往往是断层复杂、构造破碎、储层变化大、圈闭类型多的区域,其油气勘探开发需要高精度的地震资料,必须发挥海底电缆地震技术具有的观测点定位准确,可以消除电缆鬼波影响,方便地实施宽方位、多方位、全方位的地震数据采集等优势。应用效果表明,通过对中国近海海底电缆地震数据的有效处理,可以得到高精度的地震数据,从而满足油气富集区油气勘探开发的资料精度要求。
There are some problems in marine seismic acquisition by towing streamer,such as inexact receiver position,destroying high frequencies by ghost and narrow azimuth in 3D data acquisition,making the acquired seismic data poor in accuracy.In the abundant hydrocarbon areas offshore China,however,the seismic data with high accuracy is needed in exploration,due to complex faults,broken structures,sharply changed reservoirs and various types of trap there.Therefore,the technical advantages of ocean-bottom cabel(OCB) seismic survey have to be exploited,including exact position of observation points,eliminating ghost impacts and easily acquiring data in wide,multipe and complete azimuth.Its applications have indicated that the effective processing of OBC data offshore China can provide seismic data in high quality,and meet the demand of hydrocarbon exploration in the abundant hydrocarbon areas.
There are some problems in marine seismic acquisition by towing streamer,such as inexact receiver position,destroying high frequencies by ghost and narrow azimuth in 3D data acquisition,making the acquired seismic data poor in accuracy.In the abundant hydrocarbon areas offshore China,however,the seismic data with high accuracy is needed in exploration,due to complex faults,broken structures,sharply changed reservoirs and various types of trap there.Therefore,the technical advantages of ocean-bottom cabel(OCB) seismic survey have to be exploited,including exact position of observation points,eliminating ghost impacts and easily acquiring data in wide,multipe and complete azimuth.Its applications have indicated that the effective processing of OBC data offshore China can provide seismic data in high quality,and meet the demand of hydrocarbon exploration in the abundant hydrocarbon areas.
引文
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[3]施和生,柳保军,颜承志,等.珠江口盆地白云-荔湾深水区油气成藏条件与勘探潜力[J].中国海上油气,2010,22(6):369-374.
[4]李绪宣,温书亮,尹成.深水崎岖海底区不同采集方向地震波照明能量分布特征研究[J].中国海上油气,2010,22(2):73-76.
[2]龚再升.继续勘探中国近海盆地花岗岩储层油气藏[J].中国海上油气,2010,22(4):213-220.
[3]施和生,柳保军,颜承志,等.珠江口盆地白云-荔湾深水区油气成藏条件与勘探潜力[J].中国海上油气,2010,22(6):369-374.
[4]李绪宣,温书亮,尹成.深水崎岖海底区不同采集方向地震波照明能量分布特征研究[J].中国海上油气,2010,22(2):73-76.
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