下扬子地区古生界海相碳酸盐岩层序地层发育模式及储层预测

doi:10.11743/ogg20110511

摘要/Abstract

摘要：

以层序地层学、沉积学等理论、方法为指导,以野外露头资料为主,综合应用钻井、测井等资料对下扬子地区古生代海相地层进行了研究。在野外考察过程中识别出代表四种类型层序边界的不整合面,即隆升侵蚀型不整合、海侵上超型不整合、水下侵蚀型不整合和暴露侵蚀型不整合。此外,还识别出4种类型的凝缩段,即震旦系的煤层,志留系、石炭系高骊山组的页岩,奥陶系的薄层白云岩以及石炭系的薄层灰岩。根据这些界面标志,共划分出11个二级层序,建立了下扬子区层序地层格架。在此基础上,根据下扬子地区古生界野外露头剖面所确定的岩性、岩相、沉积构造等沉积标志特征,确定了下扬子地区古生界发育3种沉积体系类型,即大陆沉积体系,海陆过渡沉积体系和海洋沉积体系。最后结合区域性大地构造背景及前人研究成果,对本区的盆地性质及演化进行了研究,并分别建立了研究区震旦纪-晚奥陶世、泥盆世和石炭纪两坳夹一隆型的克拉通盆地层序模式、晚奥陶世末到晚志留世的前陆盆地层序模式和中、晚奥陶世、晚二叠世-中三叠世的被动大陆边缘盆地层序模式,总结了其各自的层序发育特征,明确了研究区不同类型背景的层序的储层的发育特征。

关键词: 层序模式, 沉积体系, 海相地层, 碳酸盐岩, 层序地层学, 古生界, 下扬子地区

Abstract:

According to the principles of sequence stratigraphy and sedimentology,we studied the Paleozoic marine deposits in the Lower Yangtze area by using outcrop observation data integrated with drilling and logging data.We identified four types of unconformities through field observation,including uplifting-erosion unconformity,transgressive onlapping unconformity,underwater erosional unconformity and subareal erosional unconformity.In addition,we also identified 4 types of condensed sections,including the Sinian coal layer,the Silurian-Carboniferous Gaolishan Formation shale,thin Ordovician dolomite and thin Carboniferous limestone.According to these boundary marks,11 second-order sequences were recognized and a sequence stratigraphic framework was established in the Lower Yangtze area.According to the lithologies,facies and sedimentary structures defined through field outcrop observation,we established three sedimentary systems for the Paleozoic in the study area, namely continental sedimentary system,transition sedimentary system and ocean sedimentary system.Finally,based on the regional tectonic setting and previous research results,we studied the nature and evolution of basin in the study area.Three sequence stratigraphic models were established,i.e. the Sinian-Late Ordovician,Devonian and Carboniferous stratigraphy model of craton basin,the latest Ordovician-Late Silurian stratigraphy model of foreland basin and the Middle and Late Ordovician,Late Permian-Middle Triassic stratigraphy model of passive margin basin.Their sequence characteristics were summarized.

Key words: sequence model, sedimentary system, marine strata, carbonate rock, sequence stratigraphy, Paleozoic, Lower Yangtze area

中图分类号:

TE121.3

纪友亮,周勇,王改为,等. 下扬子地区古生界海相碳酸盐岩层序地层发育模式及储层预测[J]. 石油与天然气地质, 2011, 32(5): 724-732,786. doi: 10.11743/ogg20110511 Ji Youliang,Zhou Yong,Wang Gaiwei,et al. Sequence stratigraphic models and reservoir prediction of the Paleozoic marine carbonates in the Lower Yangtze area[J]. Oil & Gas Geology, 2011, 32(5): 724-732,786. doi: 10.11743/ogg20110511

参考文献

[1] 姜在兴. 沉积体系及层序地层学研究现状及发展趋势[J]. 石油与天然气地质, 2010, 31(5): 535-556. Jiang Zaixing. Studies of depositional systems and sequence stratigraphy: the present and the future[J]. Oil ＆ Gas Geology, 2010, 31(5): 535-556. [2] 郑荣才, 彭军, 吴朝容. 陆相盆地基准面旋回的级次划分和研究意义[J]. 沉积学报, 2001, 19(2): 249-255. Zheng Rongcai, Peng Jun, Wu Chaorong. Grade division of base-level cycles of terrigenous basin and its implications[J]. Aata Sedimentologica Sinica, 2001, 19(2): 249-255. [3] 邓宏文. 美国层序地层研究中的新学派--高分辨率层序地层学[J]. 石油与天然气地质, 1995, 16(2): 89-97. Deng Hongwen. A new school of thought in sequence strati-graphic studies in U. S. A.: high-resolution sequence stratigraphy[J]. Oil ＆ Gas Geology, 1995, 16(2): 89-97. [4] Lin Changsong, Zheng Herong, Ren Jianye, et al. The control of syn-depositional faulting on the Eogene sedimentary basin fills of the Dongying and Zhanhua sags, Bohai Bay Basin[J]. Science in China: Series D, 2004, 47(9): 769-782. [5] 林畅松. 沉积盆地的层序和沉积充填结构及过程响应[J]. 沉积学报, 2009, 27(5): 849-862. Lin Changsong. Sequence and depositional architecture of sedimentary basin and process responses[J]. Acta Sedimentologica Sinica, 2009, 27(5): 849-862. [6] 邓宏文. 高分辨率层序地层学应用中的问题探析[J]. 古地理学报, 2009, 11(5): 471-480. Deng Hongwen. Discussion on problems of applying high resolution sequence stratigraphy[J]. Journal of Palaeogeography, 2009, 11(5): 471-480. [7] 董桂玉, 陈洪德, 何幼斌, 等. 陆源碎屑与碳酸盐混合沉积研究中的几点思考[J]. 地球科学进展, 2007, 22(9): 931-939. DongGuiyu, ChenHongde, He Youbin, et al Some problems on the study of themixed siliciclastic carbonate sediments[J]. Advances in Earth Science, 2007, 22 (9): 931-939. [8] 纪友亮, 张世奇. 陆相断陷湖盆层序地层学[M]. 北京:石油工业出版社, 1996. 12. Ji Youliang, Zhang Shiqi. The sequence stratigraphy of terrestrial rift lacustrine basin[M]. Beijing: Petroleum industry press, 1996. 12. [9] 纪友亮, 张世奇, 李红南. 东营凹陷下第三系陆相盆地层序地层学研究[J]. 地质论评, 1994, 40(增刊): 97-105. Ji Youliang Zhang Shiqi, Li Hongnan. The study of sequence stratigraphy of terrestrial basin of lower Tertiary in Dongying Depression[J]. Geological Review, 1994, 40(supplement):97-105. [10] Vail P R, Mitchm R M J, Thomposon S H. Seismic stratigraphy and global changes of sea level//Part-4, In: C. E. Pation(Editor): Seismic stratigraphy applications to hydrocarbon exploration, m. Assoc. Pt. Geol. AAPG Memoir. 1977, 26: 26-98. [11] Howell J A, Aitken J F. High resolution sequence stratigraphy: innovations and applications[J]. Geological Society Special Publication, 1996, 104: 1-24. [12] 蔡希源, 李思田. 陆相盆地高精度层序地层学[M]. 北京:地质出版社, 2003:69-80. Cai Xiyuan, Li Sitian. High resolution sequence stratigraphy of lacustrine basin[M]. Beijing: Geology press, 2003:69-80. [13] 江苏省地质矿产局. 江苏省及上海市区域地质志[M]. 北京:地质出版社. 1982: 67-220. Geological survey of Jiansu Province. Regional geology of Jiansu province and Shanghai city[M]. Beijing: Geology Press, 1982: 67-220. [14] 安徽地矿局. 安徽省岩石地层[M]. 中国地质大学出版社, 1997. Geological survey of Anhui Province. Petrology and stratigraphy of Anhui province[M]. Beijing: China University of Geology Press, 1997: 88-120. [15] 江苏地矿局. 江苏省岩石地层[M]. 中国地质大学出版社, 1997. Geological survey of Jiansu Province. Petrology and stratigraphy of Jiansu province[M]. Beijing: China University of Geology Press, 1997: 57-81.