Oil & Gas Geology ›› 2016, Vol. 37 ›› Issue (5): 756-763.doi: 10.11743/ogg20160515

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Relationship between reservoir development in the Middle Permian Maokou Formation and paleostructure evolution in the Sichuan Basin

Li Dajun1,2, Chen Hui2, Chen Hongde1, Liang Hong2, Peng Cai2, Xia Ming2, Duan Hongzhen3   

  1. 1. College of Energy Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. PetroChina CCDC Geophysical Prospecting Company, Chengdu, Sichuan 610059, China;
    3. CNPC Logging Qinghai Business Division, Dunhuang, Gansu 736202, China
  • Received:2015-11-23 Revised:2016-08-31 Online:2016-10-08 Published:2016-11-07

Abstract: The development characteristics and main controlling factors of reservoirs in the Middle Permian Maokou Formation in Sichuan Basin were studied based on drilling and logging data,framework seismic sections and regional geolo-gical data.The relationship between paleostructure evolution and formation of geomorphology,karst landform and dolomitization zone of the Formation,was also discussed systematically to predict potential reservoir zones there.Study shows that the Caledonian Movement defined and shaped the fundamental landforms of the Middle & Lower Permian in the Basin and the Emei mantle plume's uprising exerted a continuous influence on the paleogeomorphology evolution in the whole Permian.As a result,southwestern Basin turned to an inherited paleogeomorphological high.It is not only a sedimentary paleogeomorphological high for the development of high energy bank depositsin the Formation but also a paleogeomorphological high for the development of weathering crust karst on top of the Formation.Emei tafrogeny provided migration pathways of hydrothermal fluid and acid diagenesis fluids for the overprint of multi-stage dolomitization and dissolution on early band deposits and karstification,thus largely controlled the distribution of dolomite reservoirs in the Formation.

Key words: paleostructure, dolomite, Maokou Formation, Middle Permian, Sichuan Basin

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