大民屯凹陷沙四段—沙三段层序地层格架及岩性油气藏预测
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摘要
利用高精度3D地震、测井和录井资料,建立了大民屯凹陷沙三段、沙四段高精度层序地层格架。沙三段、沙四段层序体系域构成特征属于受同沉积断裂坡折控制的层序,低位体系域主要发育低位三角洲,并分布在同沉积断裂坡折之下;高位体系域主要发育大型河流或扇三角洲沉积体系,并发育四级层序;湖扩展体系域在坡折带之下发育深湖泥岩和油页岩,在坡折之上发育滨浅湖沉积。SSq3-1层序(沙三中下亚段)和SSq2-1层序(沙四段)发育的受同沉积断裂坡折控制的低位域砂体分布在湖扩展域优质烃源岩之下。这些砂体正好处于沙三段、沙四段超压带内,对形成岩性油气藏十分有利。斜坡区SSq2-1层序、荣胜堡洼陷SSq2-1和SSq3-1层序发育的受同沉积断裂控制的低位域砂体最有利于形成岩性油气藏。
By using high resolution 3D seismic data,log curves and logging data,high resolution stratigraphy frameworks of the third and fourth members of Shahejie Formation in Damintun Depression are established in order to recognize sequence system tract characteristics.The system tracts of Sha 3 and Sha 4 members are controlled by synsedimentary faulting.LST delta distributes below the synsedimentary faulting slope break,while fluvial delta and fan delta mainly develope in HST.In lake expanding system tract,deep lake mudstone and oil shale distribute below the slope break,shallow lake sediments distribute above the slope break.LST sand bodies of SSq3-1 and SSq2-1 sequences controlled by synsedimentary faulting slope break spread under the high quality source rocks,just being in the overpressured zones of Sha 3 and Sha 4 members,which is favorable for the lithologic reservoirs formation.The LST sand bodies of SSq2-1 sequence in west slope zone and SSq2-1 and SSq3-1 sequences in Rongshengpu Sag are most favorable for lithologic reservoirs forming.
By using high resolution 3D seismic data,log curves and logging data,high resolution stratigraphy frameworks of the third and fourth members of Shahejie Formation in Damintun Depression are established in order to recognize sequence system tract characteristics.The system tracts of Sha 3 and Sha 4 members are controlled by synsedimentary faulting.LST delta distributes below the synsedimentary faulting slope break,while fluvial delta and fan delta mainly develope in HST.In lake expanding system tract,deep lake mudstone and oil shale distribute below the slope break,shallow lake sediments distribute above the slope break.LST sand bodies of SSq3-1 and SSq2-1 sequences controlled by synsedimentary faulting slope break spread under the high quality source rocks,just being in the overpressured zones of Sha 3 and Sha 4 members,which is favorable for the lithologic reservoirs formation.The LST sand bodies of SSq2-1 sequence in west slope zone and SSq2-1 and SSq3-1 sequences in Rongshengpu Sag are most favorable for lithologic reservoirs forming.
引文
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[4]Sharp W D,Clague D A.50-Ma initiation of Hawaiian-Emperor Bend records major change in Pacific plate motion[J].Science,2006,3131(9):10-13.
[5]Lee T Y,Lawver L A.Cenozoic plate reconstruction of Southeast Asia[J].Tectonophysics,1995,251:85-138.
[6]Howell J A,Flint S S.A model for high resolution sequence strati-graphy within extensional basins[C]∥Howell J A,Aitken J F,eds.High Resolution Stratigraphy:Innovations and Applications.London:Geology Society Special Publication,1996,104:129-137.
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