Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (2): 454-464.doi: 10.13278/j.cnki.jjuese.20190266

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Petrological Characteristics and Sedimentary Environment of Qixia Formation in Guang’an Area, Sichuan Basin

Yi Haiyong1, Cui Baochen2, Wang Yaolin3, Qiu Yuchao1, Xu Shenglin3, Li Qian3   

  1. 1. Southwest Oil&Gas Filed Company, PetroChina, Chengdu 610056, China;
    2. PetroChina Foreign Cooperation Administration Department, Beijing 100011, China;
    3. Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
  • Received:2019-12-10 Online:2020-03-26 Published:2020-03-31
  • Supported by:
    Supported by Project of Major Science and Technology Projects of China National Petroleum Corporation (2016E-0603)

Abstract: A series of petroleum exploration discoveries have been made in Qixia Formation of Middle Permian in Sichuan basin, which has great resource potential. However, the previous research on the petrological characteristics and sedimentary environment of Middle Permian Qixia Formation in Guang'an area is weak. On the basis of geological survey, combined with petrology and petrography, the authors studied the carbonate rock characteristics, sedimentary facies types,and paleo-geographical distribution characteristics of Qixia Formation. The result shows that there are seven rock types developed in Qixia Formation in Guang'an area, including sparry bioclastic limestone, sparry granular limestone, microcrystalline bioclastic limestone, microcrystalline granular limestone, biofragmentary microcrystalline limestone, biofragmentary microcrystalline limestone containing biofragmentary microcrystalline limestone, and micritic limestone. The carbonate grains are mainly bioclastic, and spherules in some layers. Paleontological fossils are mainly trilobites, brachiopods, foraminifera, as well as echinoderms and algae. In the deposition period of Qixia Formation, the depositional environment was mainly a carbonate platform; in the later stage of Qixia Formation (Member 2), the marginal-platform shoals and intra-platform shoals were well developed, which provides favorable conditions for hydrocarbon accumulation in this area.

Key words: rock types, sedimentary environment, Qixia Formation, Guang'an area, Sichuan basin

CLC Number: 

  • P588.2
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