Datailed characterization and interpretation of sedimentary sequences under evaporitic environments: a case from the Ma56 submember of Middle Ordovician in central Ordos Basin
Huang Dao-Jun1, Zhong Shou-Kang2,3, Zhang Dao-Feng1, Wang Bao-Bao2,3, Liao Jian-Chu1, Xie Kang2,3, Lu Zi-Xing1, Tan Xiu-Cheng2,3
1 Research Institute of Exploration and Development,Changqing Oilfield Company of PetroChina,Xi’an 710021,China; 2 Southwest Petroleum University,Division of Key Laboratory of Carbonate Reservoirs,CNPC,Chengdu 610500,China; 3 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China
Abstract：Assemblages of co-occurred dolomite and gypsum are controlled by chemical sedimentary differentiation,and precise characterization of sedimentary sequences is conducive to revealing sedimentary information in evaporatic environments. Based on drilling and coring data of the Ma56 submember of the Ordovician Majiagou Formation in the central Ordos Basin,we studied characterization of typical sedimentary sequences based on macro-and microscopic observation of rocks. The study shows that: (1)paragenetic assemblage of carbonate and evaporite rocks is widely developed in the Ma56 submember of the Ordovician Majiagou Formation in the central Ordos Basin,including 10 subtypes of facies;(2)five kinds of sedimentary sequences were summarized,characterized by the lithological assemblage of the lower dolomite and upper gypsum facies and exposed surfaces at the top of each sequence,which shows shallowing and salinizing upward due to gradual replenishment of superposed seawater from evaporative platforms;(3)in the restricted evaporation platform environment,there are mainly four sedimentary subfacies and 11 sedimentary microfacies: lagoon/inter-shoal marine,shoal,lime mud mound and platform flat. Furthermore,the sedimentary sequences in the study area and those in typical evaporative tidal flat are distinguished from each other in terms of lithologic association and sedimentary structures;(4)there were two cycles of sea-level rises and falls recorded in the Ma56 submember,and the sedimentary environments could be corresponding to dolomite lagoon,lime mud mound and carbonate shoal,gypsum lagoon,evaporite lagoon,and tidal flat. The above results can provide systematic petrological evidence for the study of sedimentary environments and sea-level change of the Ma56 submember in Ordos Basin.
Huang Dao-Jun,Zhong Shou-Kang,Zhang Dao-Feng et al. Datailed characterization and interpretation of sedimentary sequences under evaporitic environments: a case from the Ma56 submember of Middle Ordovician in central Ordos Basin[J]. JOPC, 2021, 23(4): 735-755.
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