方差技术在“气云区”深度预测中的应用探讨
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摘要
由于"气云区"逸散气体分布的不均衡,造成了平面范围内地震资料受浅层气影响的程度存在很大差异,使得"气云区"的时间构造图不能精确地转换为深度构造图,进而增大了构造误差带来的油气藏开发风险。通过把受浅层气影响程度与地震方差数据体的平面属性结合起来,运用实际油田资料建立了目的层之上方差体振幅之和属性与"气云区"浅层气的总体影响程度之间的数学关系式。渤中29-4油气田应用效果表明,运用该数学关系式可以得到较为准确的砂体深度构造图,为油气田开发提供可信的构造信息,从而成功规避因构造误差而带来的开发风险。
Within a "gas cloud area",there are great differences in the shallow gas influence on areal seismic data,because of an uneven distribution of escaping gas,and the time maps can not be accuratelly transformed into the depth maps,thus increasing the reservoir development risk from structural errors.By combining the shallow gas influence with the areal attribute of seismic variance cube,some actual oilfield data were used to establish a relational expression between the sum of variance cube amplitude over a target formation and the total shallow gas influence whith a "gas cloud area".Its application in BZ29-4 oilfield has shown that this relational expression can generate more accurate depth maps,provide reliable structure information for field development,and avoid the development risk from structural errors.
Within a "gas cloud area",there are great differences in the shallow gas influence on areal seismic data,because of an uneven distribution of escaping gas,and the time maps can not be accuratelly transformed into the depth maps,thus increasing the reservoir development risk from structural errors.By combining the shallow gas influence with the areal attribute of seismic variance cube,some actual oilfield data were used to establish a relational expression between the sum of variance cube amplitude over a target formation and the total shallow gas influence whith a "gas cloud area".Its application in BZ29-4 oilfield has shown that this relational expression can generate more accurate depth maps,provide reliable structure information for field development,and avoid the development risk from structural errors.
引文
[1]黄兆林,杨平华,杨玉江.气层预测技术在东海某三维区的应用[J].中国海上油气,2005,17(1):16-20.
[2]张树林.莺歌海盆地气层反射地震波动力学特征[J].中国海上油气(地质),2001,15(4):269-275.
[3]史伟.浅析三维地震勘探中的方差数据体[J].山西建筑,2009,35(25):147-149.
[4]李彦鹏,孙鹏远,魏庚雨,等.利用陆上三分量数据改善气云区构造成像[J].石油地球物理勘探,2009,44(4):417-424.
[5]李书瑜.利用方差体技术有效识别断层[J].江汉石油学院学报,2003,25(3):9.
[6]苑书金.地震相干体技术的研究综述[J].勘探地球物理进展,2007,30(1):7-16.
[7]顾兆峰,张志珣,刘怀山.海底浅层圈闭与浅层气地震反射特征对比[J].海洋地质与第四纪地质,2009,29(3):115-122.
[8]顾兆峰,张志珣,刘怀山,等.南黄海西部地区浅层气地震特征[J].海洋地质与第四纪地质,2006,26(3):65-74.
[9]鲁全贵,陈雪芳,向家万.一种消除浅层天然气影响的时深转换技术[J].天然气地球科学,2007,18(4):616-620.
[10]LIU Chuncheng,XIA Qinglong.Offshore multi-wave seismic ex-ploration in Bohai[J].Applied Geophysics,2004,1(1):26-31.
[2]张树林.莺歌海盆地气层反射地震波动力学特征[J].中国海上油气(地质),2001,15(4):269-275.
[3]史伟.浅析三维地震勘探中的方差数据体[J].山西建筑,2009,35(25):147-149.
[4]李彦鹏,孙鹏远,魏庚雨,等.利用陆上三分量数据改善气云区构造成像[J].石油地球物理勘探,2009,44(4):417-424.
[5]李书瑜.利用方差体技术有效识别断层[J].江汉石油学院学报,2003,25(3):9.
[6]苑书金.地震相干体技术的研究综述[J].勘探地球物理进展,2007,30(1):7-16.
[7]顾兆峰,张志珣,刘怀山.海底浅层圈闭与浅层气地震反射特征对比[J].海洋地质与第四纪地质,2009,29(3):115-122.
[8]顾兆峰,张志珣,刘怀山,等.南黄海西部地区浅层气地震特征[J].海洋地质与第四纪地质,2006,26(3):65-74.
[9]鲁全贵,陈雪芳,向家万.一种消除浅层天然气影响的时深转换技术[J].天然气地球科学,2007,18(4):616-620.
[10]LIU Chuncheng,XIA Qinglong.Offshore multi-wave seismic ex-ploration in Bohai[J].Applied Geophysics,2004,1(1):26-31.
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