Sedimentary characteristics of the Ediacaran microbial carbonates and their geological implications: a case study of the Member 4 of Dengying Formation from Wellblock MX8 in central Sichuan Basin
Luo Yao1,2, Tan Xiu-Cheng1,2, Zhao Dong-Fang1,2, Luo Wen-Jun3, Liu Yun3, Xiao Di1,2, Qiao Zhan-Feng4, Zeng Wei1,2
1 State Key Laboratory of Oil and Gas Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China; 2 Research Branch of Southwest Petroleum University,Key Laboratory of Carbonate Reservoirs,CNPC,Chengdu 610500, China; 3 Research Institute of Exploration and Development,PetroChina Southwest Oil & Gasfield Company,Chengdu 610041,China; 4 Key Laboratory of Carbonate Reseviors, CNPC,Hangzhou 310023, China
Abstract：The Ediacaran microbial carbonate rocks are widely developed in the Dengying Formation in the Gaoshiti-Moxi area of the Sichuan Basin. This paper takes the Member 4 of the Dengying Formation in Wellblock MX8 as an example. By analyzing the macroscopic and microscopic petrological characteristics of the high-frequency upward shallowing sequence,it is found that the microbial dolomite and sequence construction in the Member 4 of Dengying Formation have the following characteristics: (1)The upward shallowing sequence is mainly composed of thrombolites,stromatolites,microbial dolomicrite and a small amount of microbial bonded granular dolomite. (2)The complete typical upward shallowing sequence is composed of six lithologic units from bottom to top,including microbial dolomicrite(A),flat stromatolite(B),small hummocky stromatolite(C),dispersed thrombolite(D),latticed thrombolite(E),microbial bonded granular dolomite(F). A large number of sequences are composed of incomplete lithologic units such as A-C-E,A-C-D,B-D,B-C-D-E,and the top and bottom of the sequence are distinguished by uneven lithologic mutation surfaces or exposure surfaces such as thrombolites-microbial dolomicrite,stromatolites-microbial dolomicrite. (3)The Ediacaran microbial carbonates were developed in relatively high energy areas above the wave base to near the average sea level,and the environmental energy of the thrombolites are much higher than that of the stromatolites. The results reveal that the high-energy shallow water environment not only controls the distribution of large-scale microbial rocks,but also provides guidance for regional reservoir prediction. Meanwhile,the results are of great sedimentological significance in the establishment of an environmental distribution model that is different from modern microorganisms.
Luo Yao,Tan Xiu-Cheng,Zhao Dong-Fang et al. Sedimentary characteristics of the Ediacaran microbial carbonates and their geological implications: a case study of the Member 4 of Dengying Formation from Wellblock MX8 in central Sichuan Basin[J]. JOPC, 2022, 24(2): 278-291.
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