鄂尔多斯盆地上古生界层序地层划分及演化
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摘要
利用露头、岩心、钻测井、地震资料,进行层序界面识别,建立鄂尔多斯盆地上古生界的层序地层格架,将其划分为5个二级层序、19个三级层序,并分析了层序的体系域构成及其基本特征。二级层序对应于特定的构造—沉积演化阶段:SS1—裂陷海湾与局限海共存阶段;SS2—统一陆表海阶段;SS3—近海平原沼泽、三角洲阶段;SS4—近海湖盆沉积阶段;SS5—内陆红色碎屑岩沉积阶段。建立了三种层序格架中的沉积砂体发育模式(包括太原组的海陆交互相潮坪—三角洲模式,山西组的近海平原沼泽—三角洲模式、下石盒子组的辫状河—辫状三角洲模式),并对层序格架中的主要砂体类型及分布进行分析预测。
Through integrated studies of outcrops,cores,drilling,well logging and seismic data,sequence interfaces are identified and sequence framework of the Upper Palaeozoic of Ordos Basin is established. The Upper Paleozoic of Ordos Basin can be divided into 5 second order sequences and 19 third order sequences,the basic characteristics and constitution of system tracts of which are also analyzed. Each second order sequence corresponds to specific tectonic-deposition evolution stages :SS1 corresponds to rift bay and restricted epiric sea coexistence stage; SS2 corresponds to unified epicontinental sea stage; SS3 corresponds to offshore plain swamp-delta stage; SS4 corresponds to seaside lake basin deposition stage; SS5 corresponds to inland red clastic rock deposition stage. Three models are established for the development of sedimentary sandbodies in sequence frameworks (including tidal flat-delta model of marine-continental alternative deposition in Taiyuan Formation,offshore plain swamp-delta model in Shanxi Formation and braided river-braided delta model in lower Shihezi Formation). The main sandbody types and their distribution in sequence frameworks are analyzed and predicated.
Through integrated studies of outcrops,cores,drilling,well logging and seismic data,sequence interfaces are identified and sequence framework of the Upper Palaeozoic of Ordos Basin is established. The Upper Paleozoic of Ordos Basin can be divided into 5 second order sequences and 19 third order sequences,the basic characteristics and constitution of system tracts of which are also analyzed. Each second order sequence corresponds to specific tectonic-deposition evolution stages :SS1 corresponds to rift bay and restricted epiric sea coexistence stage; SS2 corresponds to unified epicontinental sea stage; SS3 corresponds to offshore plain swamp-delta stage; SS4 corresponds to seaside lake basin deposition stage; SS5 corresponds to inland red clastic rock deposition stage. Three models are established for the development of sedimentary sandbodies in sequence frameworks (including tidal flat-delta model of marine-continental alternative deposition in Taiyuan Formation,offshore plain swamp-delta model in Shanxi Formation and braided river-braided delta model in lower Shihezi Formation). The main sandbody types and their distribution in sequence frameworks are analyzed and predicated.
引文
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12邵龙义,窦建伟,张鹏飞.含煤岩系沉积学和层序地层学研究现状和展望[J].煤田地质与勘探,1998,26(1):67-72[Shao Longyi,Dou Jianwei,Zhang Pengfei.The status and prospect of sedi-mentology and sequence stratigraphy research on the coal bearing stra-ta[J].Coal Geology&Exploration,1998,26(1):67-72]
2付金华,段晓文,席胜利.鄂尔多斯盆地上古生界气藏特征[J].天然气工业,2000,20(6):16-20[Fu Jinhua,Duan Xiaowen and Xi Shengli.Characteristics of Upper Paleozoic gas reservoirs in Ordos Ba-sin[J].Natural Gas Industry,2000,20(6):16-20]
3尚冠雄.华北地台晚古生代煤地质学研究[M].太原:山西科学技术出版社,1997:3-12[Shang Guangxiong.Studies of Coal Geology of Late Paleozoic in North China Platform[M].Taiyuan:Press of Sci-ence and Technology of Shanxi Province,1997:3-12]
4李增学,李守春,魏久传.内表海含煤盆地层序地层分析的思路和方法[J].石油与天然气地质,1996,17(1):1-7[Li ZengXue,Li Shouchun,Wei Jiuchuan.The thought and method of sequence strati-graphic analysis in epicontinental coal-bearing basin[J].Oil&Gas Geology,1996,17(1):1-7]
5陈世锐,刘焕杰.华北石炭—二叠纪层序地层格架及其特征[J].沉积学报,1999,17(1):63-69[Chen Shirui,Liu Huanjie.Sequence stratigraphic framework and its characteristics of the Carboniferous-Per-mian in north China[J].Acta Sedimentologica Sinica,1999,17(1):63-69]
6李宝芳,温显端,李贵东.华北石炭、二叠系高分辨率层序分析[J].地学前缘,1999,6(增刊):81-92[Li Baofang,Wen Xianduan and Li Guidong.High resolution sequence stratigraphy analysis of Carbonifer-ous and Permian System in north China[J].Earth Science Fronties:China University of Geosciences,1999,6(Suppl.):81-92]
7樊太亮,郭齐军,吴贤顺.鄂尔多斯盆地北部上古生界层序地层特征与储层发育规律[J].现代地质,1999,13(1):32-36[Fan Tail-iang,Guo Qijun,Wu Xianshun.Features of sequence stratigraphy and distribution regularities of reservoir in Upper Paleozoic of north Ordos Basin[J].Geoscience,1999,13(1):32-36]
8翟爱军,邓宏文,邓祖佑.鄂尔多斯盆地上古生界层序地层与储层预测[J].石油天然气地质,1999,20(4):336-340[Zhai Aijun,Deng Hongwen,Deng Zuyou.Sequence stratigraphy and reservoir pre-diction of Upper Paleozoic in Ordos Basin[J].Oil&Gas Geology,1999,20(4):336-340]
9贾进华,刘焕杰,郭英海.鄂尔多斯盆地西缘晚石炭世沉积体系与高频层序旋回[J].沉积学报,1999,17(3):397-402[Jia Jinhua,Liu Huanjie,Guo Yinghai.Late Carboniferous depositional systems and high-resolution sequence cycles of the western Ordos basin-taking Hulusitai as an example[J].Acta Sedimentologica Sinica,1999,17(3):397-402]
10王英民.对层序地层学工业化应用中层序分级混乱问题的探讨[J].岩性油气藏,2007,19(1):9-15[Wang Yingming.Analysis of the mess in sequence hierarchy applied in the industrialized appli-cation of seqence stratigraphy[J].Lithologic Reservoir,2007,19(1):9-15]
11邵龙义,张鹏飞,窦建伟,等.含煤岩系层序地层分析的新认识———兼论河北南部晚古生代层序地层格架[J].中国矿业大学学报,1999,28(1):1-5[Shao Longyi,Zhang Pengfei,Dou Jianwei,et al.New considerations on coal measures sequence stratigraphy:a case study from the Late Paleozoic coal measures in South Hebei[J].Journal of China University of Mining&Technology,1999,28(1):1-5]
12邵龙义,窦建伟,张鹏飞.含煤岩系沉积学和层序地层学研究现状和展望[J].煤田地质与勘探,1998,26(1):67-72[Shao Longyi,Dou Jianwei,Zhang Pengfei.The status and prospect of sedi-mentology and sequence stratigraphy research on the coal bearing stra-ta[J].Coal Geology&Exploration,1998,26(1):67-72]
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