Unconformity characteristics and its petroleum geological implication in key tectonic change stages, Sichuan Basin

  • WU Saijun ,
  • WEI Guoqi ,
  • YANG Wei ,
  • XIE Wuren ,
  • WANG Nai ,
  • ZENG Fuying
  • 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;
    2. Langfang Branch, PetroChina Research Institute of Petroleum Exploration & Development, Langfang 065007, China

Received date: 2015-03-13

  Revised date: 2015-04-27

  Online published: 2015-05-26


With great discoveries of natural gas in the Sinian System- Lower Cambrian, new understanding of the paleotectonic framework has been formed. The uplift and depression structure is distributed in north-south trending in that geological time. Three key tectonic change stages are Tongwan Stage, Caledonian Period and Indo- Chinese Epoch. The analysis of unconformity characteristics is an important technique in the research of tectonic evolution. Therefore, analysis of unconformities of key tectonic change stages is helpful for further understanding their influence on paleotectonic evolution. Based on the analysis of drilling, outcrop, seismic data, combined with regional geological data, we discuss the unconformity characteristics and paleotectonic evolution in the Sinian Period-Early Cambrian and their influence on gas accumulation in the Sinian System. The results showed that: 1) Three key tectonic changes formed, which are the Sinian System-Lower Cambrian (Tongwanian), Upper Cambrian-Permian (Caledonian Period) and Upper Triassic-Jurassic (Indo-Chinese Epoch), seven regional unconformities; 2) The unconformity characteristics consist of superposition and migration. Superposition mainly reflects the structural inheritance, and migration mainly reflects the change processes of paleostructure. Tectonic evolution of the Gaoshiti-Moxi zone could be divided into stages of puberty, adjustment and stabilization on the basis of unconformity characteristics; 3) Superposition of unconformity and mound-beach system in uplift zone controls karst reservoir development in the Sinian System. Unconformable surfaces can be used for migration and accumulation channels for oil and gas. Unconformity migration is helpful for analyzing the formation and vanishment of paleotectonic traps. The analysis of unconformity characteristics in key tectonic change stages is significant for the later evolution and hydrocarbon migration of uplift and depression tectonic areas in Sinian Period-Early Cambrian.

Cite this article

WU Saijun , WEI Guoqi , YANG Wei , XIE Wuren , WANG Nai , ZENG Fuying . Unconformity characteristics and its petroleum geological implication in key tectonic change stages, Sichuan Basin[J]. Science & Technology Review, 2015 , 33(10) : 93 -100 . DOI: 10.3981/j.issn.1000-7857.2015.10.009


[1] 杜金虎, 邹才能, 徐春春, 等. 川中古隆起龙王庙组特大型气田战略发现与理论技术创新[J]. 石油勘探与开发, 2014, 41(3): 268-277. Du Jinhu, Zou Caineng, Xu Chunchun, et al. Theoretical and technical in novations in strategic discovery of a giant gas field in Cambrian Longwang miao Formation of central Sichuan paleo-uplift, Sichuan Basin[J]. Petro leum Exploration and Development, 2014, 41(3): 268-277.
[2] 邹才能, 杜金虎, 徐春春, 等. 四川盆地震旦系—寒武系特大型气田形成分布、资源潜力及勘探发现[J]. 石油勘探与开发, 2014, 41(3): 278-293. Zou Caineng, Du Jinhu, Xu Chunchun, et al. Formation, distribution, resource potential and discovery of the Sinian-Cambrian giant gas field, Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2014, 41(3): 278-293.
[3] 魏国齐, 杨威, 杜金虎, 等. 四川盆地震旦纪—早寒武世克拉通内裂陷地质特征[J]. 天然气工业, 2015, 35(1): 24-35. Wei Guoqi, Yang Wei, Du Jinghu, et al. Geological characteristics of the simian-early Cambrian intracratonic rift, Sichuan Basin[J]. Natural Gas Industry, 2015, 35(1): 24-35.
[4] 汤良杰, 崔敏. 中上扬子区关键构造变革期、构造变形样式与油气保存[J]. 石油实验地质, 2011, 33(1): 12-16. Tang Liangjie, Cui Min. Key tectonic changes, deformation styles and hy drocarbon preservations in Middle- upper Yangtze region[J]. Petroleum Geology & Experiment, 2011, 33(1): 12-16.
[5] 汪泽成, 姜华, 王铜山, 等. 四川盆地桐湾期古地貌特征及成藏意义[J]. 石油勘探与开发, 2014, 41(3): 305-312. Wang Zecheng, Jiang Hua, Wang Tongshan, et al. Paleo-geomorphology formed during Tongwan tectonization in Sichuan Basin and its signifi cance for hydrocarbon accumulation[J]. Petroleum Exploration and Devel opment, 2014, 41(3): 305-312.
[6] 李忠权, 赖芳, 李应, 等. 四川盆地震旦系威远—安岳拉张侵蚀槽特征及形成演化[J]. 石油勘探与开发, 2015, 42(1): 26-33. Li Zhongquan, Lai Fang, Li Ying, et al. Formation and evolution of Wei yuan-Anyue extension- erosion groove in Sinian system, Sichuan Basin[J]. Petroleum Exploration and Development, 2015, 42(1): 26-33.
[7] 刘树根, 孙玮, 罗志立, 等. 兴凯地裂运动与四川盆地下组合油气勘探[J]. 成都理工大学学报: 自然科学版, 2013, 40(5): 511-520. Liu Shugen, Sun Wei, Luo Zhili, et al. Xingkai taphrogenesis and petro leum exploration from Upper Sinian to Cambrian Strata in Sichuan Basin, China[J]. Journal of Chengdu University of Technology: Science & Tech nology Edition, 2013, 40(5): 511-520.
[8] 许海龙, 魏国齐, 贾承造, 等. 乐山-龙女寺古隆起构造演化及对震旦系成藏的控制[J]. 石油勘探与开发, 2012, 39(4): 406-416. Xu Hailong, Wei Guoqi, Jia Chengzao, et al. Tectonic evolution of the Le shan-Longnüsi paleo-uplift and its control on gas accumulation in the Sinian strata, Sichuan Basin[J]. Petroleum Exploration and Development, 2012, 39(4): 406-416.
[9] 宋文海. 对四川盆地加里东期古隆起的新认识[J]. 天然气工业, 1987, 7 (3): 6-11. Song Wenhai. Some new knowledge of Caledonian paleo-uplift in Sich uan basin[J]. Natural Gas Industry, 1987, 7(3): 6-11.
[10] 李晓清, 汪泽成, 张兴为, 等. 四川盆地古隆起特征及对天然气的控制作用[J]. 石油与天然气地质, 2001, 22(4): 347-350. Li Xiaoqing, Wang Zecheng, Zhang Xingwei, et al. Characteristics of pa leo-uplifts in Sichuan basin and their control action on natural gases[J]. Oil & Gas Geology, 2001, 22(4): 347-350.
[11] 刘顺, 罗志立, 熊荣国, 等. 从实验岩石变形过程探讨四川盆地加里东古隆起的形成机制[J]. 成都理工学院学报, 2000, 27(4): 343-347. Liu Shun, Luo Zhili, Xiong Rongguo, et al. On formation mechanism of Caledonian paleo-uplift in Sichuan basin from experimental rocks defor mational process[J]. Journal of Chengdu University of Technology, 2000, 27(4): 343-347.
[12] 魏国齐, 沈平, 杨威, 等. 四川盆地震旦系大气田形成条件与勘探远景区[J]. 石油勘探与开发, 2013, 40(2): 129-138. Wei Guoqi, Shen Ping, Yang Wei, et al. Formation conditions and explo ration prospects of Sinian large gas fields, Sichuan Basin[J]. Petroleum Exploration and Development, 2013, 40(2): 129-138.
[13] 宋文海. 乐山—龙女寺古隆起大中型气田成藏条件研究[J]. 天然气工业, 1996, 16(增1): 13-26. Song Wenhai. Research on reservoir-formed condition of large-medium gas fields of Leshan- Longnusi palaeohigh[J]. Natural Gas Industry, 1996, 16(Suppl 1): 13-26.
[14] 韩克猷. 川东开江古隆起大中型气田的形成及勘探目标[J]. 天然气工业, 1995, 15(4): 1-5. Han Keyou. Large-Middle scale gas fields at kaijiang palaeohigh in east Sichuan and Exploration target[J]. Natural Gas Industry, 1995, 15(4): 1-5.
[15] 张廷山, 陈晓慧, 姜照勇, 等. 泸州古隆起对贵州赤水地区早、中三叠世沉积环境和相带展布的控制[J]. 沉积学报, 2008, 26(4): 583-592. Zhang Tingshan, Chen Xiaohui, Jiang Zhaoyong, et al. controls of Lu zhou uplift on sedimentary environment and facies distribution in early and middle Triassic, Chishui, Guizhou Province[J]. Acta Sedimentologi ca Sinica, 2008, 26(4): 583-592.
[16] 中国石油地质志编委会. 四川油气区: 卷十[M]. 北京: 石油工业出版社, 1989. Editorial Committee of Petroleum Geology of China. Sichuan oil and gas provinces: Vol.10[M]. Beijing: Petroleum Industry Press, 1989.
[17] 童崇光. 四川盆地构造演化与油气聚集[M]. 北京: 地质出版社, 1992: 21-25. Tong Chongguang. Tectonic evolution and hydrocarbon accumulation in Sichuan Basin[M]. Beijing: Geological Publishing House, 1992: 21-25.
[18] 汤良杰, 黄太柱, 金文正, 等. 叠合盆地差异构造变形与油气聚集[J]. 地学前缘, 2009, 16(4): 13-22. Tang Liangjie, Huang Taizhu, Jin Wenzheng, et al. Differential deforma tion and hydrocarbon accumulation in the superimposed basins[J]. Earth Science Frontiers, 2009, 16(4): 13-22.
[19] 李启桂, 李克胜, 周卓铸, 等. 四川盆地桐湾不整合面古地貌特征与岩溶分布预测[J]. 石油与天然气地质, 2013, 34(4): 516-521. Li Qigui, Li Kesheng, Zhou Zhuozhu, et al. Palaeogeomorphology and karst distribution of Tongwan unconformity in Sichuan Basin[J]. Oil & Gas Geology, 2013, 34(4): 516-521.
[20] 李启桂, 李克胜, 唐欢阳. 四川盆地不整合发育特征及其油气地质意义[J]. 天然气技术, 2010, 4(6): 21-25. Li Qigui, Li Kesheng, Tang Huanyang. Unconformity characteristics of Sichuan basin and its geological implication[J]. Natural Gas Technology, 2010, 4(6): 21-25.
[21] 薛耀松, 周传明. 扬子区早寒武世早期磷质小壳化石的再沉积和地层对比问题[J]. 地层学杂志, 2006, 30(1): 64-74. Xue Yaosong, Zhou Chuanming. Resedimentation of the early Cambrian phosphatized small shell fossils and correlation of the simian-cambrian boundary strata in the Yangtze region, Southern China[J]. Journal of Stra tigraphy, 2006, 30(1): 64-74.
[22] 薛耀松, 曹瑞骥, 唐天福, 等. 扬子区震旦纪地层序列和南、北方震旦系对比[J]. 地层学杂志, 2001, 25(3): 207-234. Xue Yaosong, Cao Ruiji, Tang Tianfu, et al. The Sinian stratigraphic se quence of the Yangtze region and correlation to the late precambrian strata of north china[J]. Journal of Stratigraphy, 2001, 25(3): 207-234.