松辽盆地南部下白垩统层序构型及沉积特征
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摘要
综合分析地质、地震和钻井资料,将松辽盆地南部中生界下白垩统地层从沙河子组到泉头组(K1sh—K1q1)划分为5个二级层序、14个三级层序,建立了松辽盆地南部地区的层序地层格架。根据其构造演化特征,将5个二级层序划分为断陷型、断坳转换型和坳陷型三类。研究表明,构造运动控制了松辽盆地南部的沉积相类型,沉积相展布特征为火山岩—冲积扇—辫状河—辫状河扇三角洲—湖泊—水下重力流、冲积扇—扇三角洲—湖泊—水下重力流组合,以及曲流河—辫状河组合。该区的碎屑岩储集体(层)主要包括沙河子组的扇三角洲沉积体系储集体、营城组的冲积扇体系储集体、登娄库组的辫状河沉积体系储集体以及泉一段的曲流河沉积体系储集体。储集层岩性主要以含砾中、粗砂岩和中、细砂岩为主,粉砂岩次之,油气显示多存在于细砂岩中。
Based on an integrated analysis of geologic,seismic and drilling data,the Lower Cretaceous Shahezi Formation-Quantou Formation(K1sh-K1q1)in the southern Songliao Basin are divided into 5 second-order and 14 third-order sequences,which consist of the sequence stratigraphic framework in southern Songliao basin.The 5 second-order sequences are grouped into 3 types,including rift,rift-depression transient,and depression.Tectonic movements determine the types of sedimentary faces in the study area,the distribution of which appears as combinations of volcanics-alluvial fan-braided river-braided river delta-lake-underwater gravitational flow,alluvial fan-fan delta-lake-underwater gravitational flow,and meandering river-braided river.The clastic reservoirs in the study area are dominated by fan delta system in Shahezi Formation,alluvial fan system in the Yingcheng Formation,braided river system in Denglouku Formation,and meandering river system in the first member of Quanzhou Formation.The reservoir lithologies are dominated by medium-and coarse-grained conglomeratic sandstone and medium-and fine-grained sandstones,followed by siltstone,with oil and gas shows mostly occurring in fine sandstone.
Based on an integrated analysis of geologic,seismic and drilling data,the Lower Cretaceous Shahezi Formation-Quantou Formation(K1sh-K1q1)in the southern Songliao Basin are divided into 5 second-order and 14 third-order sequences,which consist of the sequence stratigraphic framework in southern Songliao basin.The 5 second-order sequences are grouped into 3 types,including rift,rift-depression transient,and depression.Tectonic movements determine the types of sedimentary faces in the study area,the distribution of which appears as combinations of volcanics-alluvial fan-braided river-braided river delta-lake-underwater gravitational flow,alluvial fan-fan delta-lake-underwater gravitational flow,and meandering river-braided river.The clastic reservoirs in the study area are dominated by fan delta system in Shahezi Formation,alluvial fan system in the Yingcheng Formation,braided river system in Denglouku Formation,and meandering river system in the first member of Quanzhou Formation.The reservoir lithologies are dominated by medium-and coarse-grained conglomeratic sandstone and medium-and fine-grained sandstones,followed by siltstone,with oil and gas shows mostly occurring in fine sandstone.
引文
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[7]A GUY PLINT,PAULJ,MCCARTHY,et al.Nonma-rine sequence stratigraphy:Updip expression of sequence boundaries and systems tracts in a high-resolution frame-work,cenomanian dumvegan formation,Alberta Foreland Basin,Canada[J].AAPG Bulletin,2002,85(11):1967-2001.
[2]池秋鄂.层序地层学基础与应用[M].北京:石油工业出版社,2001.
[3]俞凯,等.松辽盆地南部断陷层系石油天然气地质[M].北京:石油工业出版社,2002.
[4]魏魁生,徐怀大.华北典型箕状断陷盆地层序地层学模式及其与油气赋存系[J].地球科学,1993,18(2):139-149.
[5]魏魁生,叶淑芬,等.松辽盆地白垩系非海相沉积层序模式[J].沉积学报,1996,14(14):50-58.
[6]L FRANK BROWNJR.Understanding growth-faulted,intraslope subbasins by applying sequence stratigraphic principles:Example fromthe south Texas Oligocene Frio Formation[J].AAPG Bulletin,2004,88(11):1501-1522.
[7]A GUY PLINT,PAULJ,MCCARTHY,et al.Nonma-rine sequence stratigraphy:Updip expression of sequence boundaries and systems tracts in a high-resolution frame-work,cenomanian dumvegan formation,Alberta Foreland Basin,Canada[J].AAPG Bulletin,2002,85(11):1967-2001.
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