东营凹陷中央隆起带构造特征、沙箱模拟与形成机制研究
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摘要
东营凹陷中央隆起带是渤海盆地济阳坳陷东营凹陷中油气最富集的区域。该构造带走向近东西,为北陡南缓两翼不对称的隆起带,上部发育"塌陷式"地堑断裂系统。由于构造受北缘断层控制,具有同沉积与逆牵引(reversedrag)特点,故勘探早期将其认为滚动背斜。20世纪80年代以来,由于钻井揭露与地球物理勘探资料的增多,研究者普遍认为是盐泥底辟构造。本次工作,是在进行详细的地震、地质解释基础上,结合前人研究成果与假设,运用沙箱实验证实方法探讨了构造带成因。通过实验与地质、地球物理的综合研究认为,东营凹陷中央隆起构造带是区域张扭力与重力联合导致的伸展—底辟作用的产物;盐泥底辟物质的形态、底辟与伸展作用的强度控制了局部构造的形态与断裂构造的发育程度。
The central uplift belt is an oil/gas enrichment zone in the Dongying depression of jiyang geotectogene.It trends nearly E-W and is a dissymmetrical anticline belt with steep dip angle in the north limb and gentle in the south.A rift\|fault system of cabbage style develops on the uplift belt.Because of the characteristics of synsedimentary and reverse drag controlled by the north boundary fault.It was considered as a roll anticline belt in the early exploration time.Due to the accumulation of geological and geophysical data,most of the following investigators have argued the origin of salt\|mud diapir structure since 80s.Based on detailed studying of sesimic and geological data and comparing to previous research results,a sadbox experiment is designed and carried through in this work to search the cause of the central uplift belt.By all the results above,we conclude that the Dongying central uplift belt was formed by extention\|diapirism lead by regional tenso\|shear stress and gravity,and the shape of the local auticlines and the character of the fault system are controlled by the shape of the salt\|mud diapir and the intensity of extension and diapirism.
The central uplift belt is an oil/gas enrichment zone in the Dongying depression of jiyang geotectogene.It trends nearly E-W and is a dissymmetrical anticline belt with steep dip angle in the north limb and gentle in the south.A rift\|fault system of cabbage style develops on the uplift belt.Because of the characteristics of synsedimentary and reverse drag controlled by the north boundary fault.It was considered as a roll anticline belt in the early exploration time.Due to the accumulation of geological and geophysical data,most of the following investigators have argued the origin of salt\|mud diapir structure since 80s.Based on detailed studying of sesimic and geological data and comparing to previous research results,a sadbox experiment is designed and carried through in this work to search the cause of the central uplift belt.By all the results above,we conclude that the Dongying central uplift belt was formed by extention\|diapirism lead by regional tenso\|shear stress and gravity,and the shape of the local auticlines and the character of the fault system are controlled by the shape of the salt\|mud diapir and the intensity of extension and diapirism.
引文
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[2] 王燮培,费琪,张家华编著.油气勘探构造分析[M].北京:中国地质大学出版社,1991.
[3] R.W.Schlishe,Geometryandoriginoffault relatedfoldsinextensionalsettings[J].AAPG,1995(79),11:1661～1678.
[4] T.P.Harding,Grabenhydrocarbonoccurrencesandstructuralstyle[J].AAPG,1984(68)3:333～362.
[5] G.S.Lister,A.Etheridge,P.A.Symonds,Detachmentfaultingandtheevolutionofpassivecontinentalmargins[J].Geology,1986,14:246～250.
[6] W.F.Dula,GeometricModelsoflistricnormalfaultsandrollerfolds[J].AAPG,1991(75):1609～1625.
[7] A.DGribbs,Structuralevolutionofextensionalbasinmargins[J].Geol.Soci.Jour.,London(141):609～620.
[8] 杜贤樾,孙焕泉,郑和荣主编.胜利油田勘探开发论文集(第二辑)[C].北京:地质出版社,1999.
[9] GeH.andM.P.Ajackson,Physicalmodelingofstructuresformedbysaltwithdrawal:Implicationfordeformationcausedbysaltdissolution[J].AAPG,Bulettin,1998,82(2):228～250.
[10] 陆克政,漆家福.渤海湾新生代含油气盆地构造模式[M].北京:地质出版社,1997.
[11] 安作相,马纪.断裂与渤海湾盆地形成和油气的关系[J].油气地质与采收率,2001,8(1):18～23.
[12] 戴俊生,陆克正,漆家福,陈书平.渤海湾盆地早第三纪构造样式的演化[J].石油大学学报(自然版),1998,19(4):16～22.
[13] 迟英柳,赵文智.渤海湾盆地新生代走滑构造与油气聚集[J].石油学报,2000,21(2):14～20.
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