Depositional model of the lower-middle Ordovician Majiagou Formation in Daniudi Gas Field,Ordos Basin
Lei Tao1, Deng Hu-Cheng2,3, Wu Dong2,3, Fu Mei-Yan2,3, Tang Ming-Yuan1, Cui Lu1, Ding Xiao-Qi2,3, Xia Yu2,3, Xie Xin-Hui2,3
1 Exploration & Development Research Institute of North China Oil and Gas Company,SINOPEC,Zhengzhou 450000,China; 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China; 3 College of Energy,Chengdu University of Technology,Chengdu 610059,China
Abstract Carbonate rocks are the important Paleozoic oil and gas reservoirs in the Ordos Basin. Based on the comprehensive analyses of core and thin section and logging data,the depositional subfacies,including evaporation platform,open platform and confined platform,were identified in the lower-middle Ordovician Majiagou Formation of the Daniudi Gas Field in the Ordos Basin. The characteristics of different depositional subfacies were analyzed in detail,and the depositional model of the lower-middle Majiagou Formation in the Daniudi Gas Field controlled by sea level fluctuation was established. The sea level was relatively low during the depositional period of the Members 1-3 of the Majiagou Formation,resulting in the development of evaporation platform. The saline lake of the Members 1 and 3 of the Majiagou Formation was mainly distributed in the southeast with the gypseous lake around it. The sea level rose slightly during the depositional period of the Member 2 of the Majiagou Formation,and subsequently muddy-dolomitic flat and gypseous-dolomitic flat developed in the entire study area from bottom to top. The open platform was developed in the Member 4 of the Majiagou Formation when the sea level reached the maximum,and uniformly distributed lime flat and overlying dolomitic-lime flat covered the whole area in the platform. The confined platform predominated the Member 5 of the Majiagou Formation during the regression-transgression-regression. In the Member 5 of the Majiagou Formation,the dolomitic flat of the 7th-10th sub-members covered the whole area,the large extent of muddy-dolomitic flat expanded from northwest to southeast in the 6th sub-member,and the lime flat of the 5th sub-member was developed in the central part with the scattered dolomitic flat around it.
Fund:Financially supported by the National Natural Science Foundation of China(No.41402096)
Corresponding Authors:
Deng Hu-Cheng,born in 1980,got his doctoral degree in 2009 from Chengdu University of Technology. Now,he is a professor and is mainly engaged in reservoir geology and exploitation. E-mail: denghucheng@cdut.cn. Wu Dong,born in 1987,got his doctoral degree in 2016 from China University of Petroleum(Beijing). Now,he is an associate researcher and is mainly engaged in depositional reservoir. E-mail: lisandpw@163.com.
About author: About the first author Lei Tao,born in 1983,got his master degree in 2011 from Chengdu University of Technology. Now,he is an assistant researcher and is mainly engaged in reservoir geology and exploitation. E-mail: netnet-168@163.com.
Cite this article:
Lei Tao,Deng Hu-Cheng,Wu Dong et al. Depositional model of the lower-middle Ordovician Majiagou Formation in Daniudi Gas Field,Ordos Basin[J]. JOPC, 2020, 22(3): 523-538.
Lei Tao,Deng Hu-Cheng,Wu Dong et al. Depositional model of the lower-middle Ordovician Majiagou Formation in Daniudi Gas Field,Ordos Basin[J]. JOPC, 2020, 22(3): 523-538.
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