莺歌海盆地水道地震相新模式及其含气性预测
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摘要
莺歌海盆地上中新统黄流组、上新统莺歌海组地层广泛发育泥岩背景下的水道砂体沉积,寻找储集物性较好的水道及预测水道的含气性是当前莺歌海盆地水道研究的难点和重点。本文分析了莺歌海盆地水道的地震相新模式:其一为在两强振幅、强连续同相轴间夹一套弱振幅、弱连续同相轴;其二为水道凸起倒置地震相。前者可纳入含砂岩为主的水道研究范畴,后者为砂泥岩差异压实作用引起。应用地震正演和AVO交会分析技术预测了该区水道的含气性,所得结论与实钻结果相符合,从而证实了本文方法的有效性。
Channel sands were extensively developed in the Late Miocene Huangliu Formation and the Pliocene Yinggehai Formation,Yinggehai Basin.Our challenges were to look for favorable channel sand bodies and predict gas-bearing traps.In this paper,two new channel seismic faces styles in the Yinggehai Basin have been analyzed: one is a weakly continuous event with weak amplitude between two strongly continuous event with strong amplitude,and the other is an inverted seismic facies of convex channels.The former belongs to channel sands.The latter is caused by differential compactions of sandstone and mudstone.Gas-bearing channels in the area are predicted by seismic forward modeling and AVO crossplot.The predictions show very good match with the actual drilling result,and demonstrate the efficiency of this method.
Channel sands were extensively developed in the Late Miocene Huangliu Formation and the Pliocene Yinggehai Formation,Yinggehai Basin.Our challenges were to look for favorable channel sand bodies and predict gas-bearing traps.In this paper,two new channel seismic faces styles in the Yinggehai Basin have been analyzed: one is a weakly continuous event with weak amplitude between two strongly continuous event with strong amplitude,and the other is an inverted seismic facies of convex channels.The former belongs to channel sands.The latter is caused by differential compactions of sandstone and mudstone.Gas-bearing channels in the area are predicted by seismic forward modeling and AVO crossplot.The predictions show very good match with the actual drilling result,and demonstrate the efficiency of this method.
引文
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[2]Castagna J P.Principles of AVO cross-plotting.TheLeading Edge,1997,16(4):337～342
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[4]殷八斤等.AVO技术的理论和实践.北京:石油工业出版社,1995
[5]张文等.AVO交会图分析技术的应用.中国海上油气(地质),2002,16(4):286～290Zhang Wen et al.An application of AVO crossplottechnique.China Offshore Oil and Gas(Geology),2002,16(4):286～290
[2]Castagna J P.Principles of AVO cross-plotting.TheLeading Edge,1997,16(4):337～342
[3]Smith G C,Gidlow P M.Weighted stacking for rockproperty estimation and detection of gas.GeophysicalProspecting,1987,35(9):993～1014
[4]殷八斤等.AVO技术的理论和实践.北京:石油工业出版社,1995
[5]张文等.AVO交会图分析技术的应用.中国海上油气(地质),2002,16(4):286～290Zhang Wen et al.An application of AVO crossplottechnique.China Offshore Oil and Gas(Geology),2002,16(4):286～290
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