东营凹陷沙河街组四段下亚段层序地层特征与沉积模式
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摘要
近年来东营凹陷南坡沙四下亚段逐渐成为重点勘探目标。由于地层的特殊性,针对研究区层序地层与砂体成因等问题的研究相对薄弱。本次研究采用V-C地层分析法,通过钻井、测井、地震、古生物等资料,将沙四下亚段划分为2个四级层序,根据地层呈叠加样式,将每个层序划分为两个中期旋回。在连井剖面层序对比的基础上建立了研究区沙四段下亚段层序地层格架,受石村断层强烈翘倾的影响,南坡东部地区沙四下顶部大面积剥蚀。该时期主要发育冲积扇和咸水湖等主要相类型,本文首次系统分析了东营凹陷南坡沙四段下亚段沉积相的演化与分布规律,建立了沙四段下亚段的沉积模式,这对于指导研究区的油气勘探具有重要意义。
In recent years,the south slope of Dongying Depression has become the focus of the exploration target.Due to its special stratigraphic formation,the study of sequence stratigraphy and sand origin of the study area is relatively weak.Using V-C formation analysis,the authors have divided the study area into two sequences on the basis of sequence boundaries,well logging curve,seismic reflective characteristics and palaeontological features.The sequence can be subdivided into two mid-cycles according to the stacking patterns of stratigraphy as well as changes of lithology and lithofacies.The sequence stratigraphic correlation in well-tied sections makes it possible to construct the regional stratigraphic framework.Due to the tilting of Shicun fault,the eastern part of the study area has been denuded.Alluvial fan and saltwater lake are developed in the study area.The evolution and distribution of sedimentary faces of lower Es4 on the south slope of Dongying depression is analyzed for the first time in this paper,and the sedimentary model is established.These research results have great significance in search for subtle traps in this depression.
In recent years,the south slope of Dongying Depression has become the focus of the exploration target.Due to its special stratigraphic formation,the study of sequence stratigraphy and sand origin of the study area is relatively weak.Using V-C formation analysis,the authors have divided the study area into two sequences on the basis of sequence boundaries,well logging curve,seismic reflective characteristics and palaeontological features.The sequence can be subdivided into two mid-cycles according to the stacking patterns of stratigraphy as well as changes of lithology and lithofacies.The sequence stratigraphic correlation in well-tied sections makes it possible to construct the regional stratigraphic framework.Due to the tilting of Shicun fault,the eastern part of the study area has been denuded.Alluvial fan and saltwater lake are developed in the study area.The evolution and distribution of sedimentary faces of lower Es4 on the south slope of Dongying depression is analyzed for the first time in this paper,and the sedimentary model is established.These research results have great significance in search for subtle traps in this depression.
引文
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[3]韦启新,苑小燕.我国东部油田红层沉积特征与油气成藏规律[J].石油学报,2008,29(2):191-194.Wei Qixin,Yuan Xiaoyan.Sediment features and oil—gas poolforming regularity of red beds in the eastern China oilfields[J].ActaPetrolei Sinica,2008,29(2):191-194(in Chinese with Englishabstract).
[4]张守鹏,刘成东,贺振建,等.东营凹陷深部“红层”地层划分方法探讨[J].地学前缘,2003,10(2):465-469.Zhang Shoupeng,Liu Chengdong,He Zhenjian,et al.Stratigraphicdivision of redbeds in deep Dongying depression,east China[J].EarthScience Frontiers,2003,10(2):465-469(in Chinese with Englishabstract).
[5]杨伟利,陈义宝.八面河地区孔店组河流-冲积相层序地层学研究[J].西安石油大学学报(自然科学版),2008,23(4):26-29.Yang Weili,Chen Yibao.Study on the sequence stratigraphy of thefluvial-alluvial facies of Kongdian formation in Bamianhe area,Dongying Sag[J].Journal of Xi’an Shiyou University(NaturalScience Edition),2008,23(4):26-29.
[6]杨玉卿,皇海权.泌阳凹陷东南缘下第三系红层成因浅析[J].河南地质,1996,14(1):39-44.Yang Yuqing,Huang Haiquan.Origin of red beds of lower Tertiaryin the southeastern margin of Biyang Depression[J].Henan Geology,1996,14(1):39-44(in Chinese with English abstract).
[7]倪超,纪友亮.饶阳凹陷古近系沙河街组层序地层分析及沉积体系研究[J].中国地质,2006,33(1):193-200.Ni Chao,Ji Youliang.Sequence stratigraphy and sedimentary systemof the Paleogene Shahejie Formation in the Raoyang subbasin[J].Geology in China,2006,33(1):193-200(in Chinese with Englishabstract).
[8]王红亮.“转换面”的概念及其层序地层学意义[J].地学前缘,2008,15(2):35-42.Wang Hongliang.Concept of turnaround surface and its significanceto sequence stratigraphy[J].Earth Science Frontiers,2008,15(2):35-42(in Chinese with English abstract).
[9]方志雄.江汉盆地盐湖沉积充填模式[M].北京:石油工业出版社,2006:201-202.Fang Zhixiong.The Filling Models of Jianghan Salt Lake Basin[M].Beijing:Petrolemu Industry Press,2006:201-202(in Chinese).
[10]屈红军,李文厚,苗建宇,等.东濮凹陷濮卫洼陷盐岩发育规律及成因探讨[J].中国地质,2003,30(3):309-314.Qu Hongjun,Li Wenhou,Miao Jianyu,et al.Development patternof salt rocks in the Puwei subdepression of the Dongpu depressionand their genesis[J].Geology in China,2003,30(3):309-314(inChinese with English abstract).
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