Microfacies and depositional model of a carbonate-evaporite symbiotic system of the Majiagou Formation in Ordos Basin
LIU Guoqing1, SU Zhongtang1,2, HAO Zhilei3,4, WEI Liubin3, REN Junfeng3, LIAO Huihong1, WU Haowen1
1 Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059,China; 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Chengdu University of Technology, Chengdu 610059,China; 3 National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields,Xi’an 710018,China; 4 Exploration Division of PetroChina Changqing Oilfield Company,Xi’an 710018,China
Abstract：The carbonate-evaporite symbiotic system is a rock symbiotic association formed by chemical depositional differentiation. Microfacies analysis and sedimentary model construction of such a system are conducive to revealing the sedimentary information that have guiding significance for oil and gas exploration in evaporatic environments. Based on a large number of borehole data of the Majiagou Formation in Ordos Basin,macro-and microscopic observation of the rocks was carried out to identify sedimentary microfacies,analyze sedimentary sequence,and construct sedimentary model.The results show that there are ten types of sedimentary microfacies(MFT1-MFT10)in the carbonate-evaporite symbiotic system of the Majiagou Formation: halite,gypsum,gypsum-bearing dolomite,laminated dolomite,crystalline dolomitic grainstone,microcrystalline dolomite,microbial dolomite,bioturbated dolomite,laminated limestone,crystalline grainstone. four types of sedimentary sequence are developed in the symbiotic system: (1)upper intertidalto supratidal dolomite-gypsodolomite-argillaceous dolostone;(2)lower intertidal evaporite-algal dolomite-dolomite;(3)subtidal laminated limestone-churned limestone-bioturbation limestone;(4)lagoonal laminated evaporite-lumpy evaporite-salt rock. Evaporites of the Majiagou Formation were formed during the shallow basins period and low sea level period,while carbonates were formed during the high sea level period.The giant carbonate-evaporite symbiotic system formed through repeated fluctuations in sea level.
LIU Guoqing,SU Zhongtang,HAO Zhilei et al. Microfacies and depositional model of a carbonate-evaporite symbiotic system of the Majiagou Formation in Ordos Basin[J]. JOPC, 2024, 26(2): 279-295.
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