Sedimentary environment and sea level change of the subsalt interval of Member 5 of Ordovician Majiagou Formation in central Ordos Basin
Xi Shengli1, Xiong Ying2, 3, Liu Xianyang1, Lei Jingchao1, Liu Mingjie2, 3, Liu Ling2, 3, Liu Yun2, 3, Wen Huibo4, Tan Xiucheng2, 3
1 Exploration Department of PetroChina Changqing Oilfield Company,Xi’an 710018,Shaanxi; 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,Sichuan; 3 PetroChina Deposition and Accumulation Department of Key Laboratory of Carbonate Reservoirs,Southwest Petroleum University,Chengdu 610500,Sichuan; 4 Changqing Well Cementation Company, CNPC Chuanqing Drilling Engineering Company, Xi’an 710018,Shaanxi
Abstract The Ordovician Majiagou Formation in the central Ordos Basin is rich in gas resources. However,previous studies generally focused on the palaeo-weathered crust reservoirs in the uppermost part of the Majiagou Formation. Based on cores,thin sections and cathodeluminescence data,we studied the subsalt interval of Member 5 of the Majiagou Formation in the central Ordos Basin. The carbonate-evaporite sediments of the subsalt interval can be divided into ten rock types. On the basis of the macro- and micro-features of all the rocks and their vertical and horizontal combination and distribution,five types of sedimentary environment were recognized in the study area,namely restricted-evaporative lagoon,bank,shallow marine,microbial mound and platform flat. The difference of rock types in each submember and their statistics indicate that the subsalt interval is characterized by cyclical deposition of carbonates and evaporites as well as eustatic sea level change,and each submember represents a transgression or regression. Consequently,the Ma56,Ma58 and Ma510 submembers are regressive sediments in restricted-evaporative lagoon,mainly consisting of laminated dolomitic gypsum and micritic dolostone,which reflects a restricted,low-energy and high salinity environment. The Ma57 and Ma59 submembers are transgressive sediments of bank and microbial mound,which usually make up a complete descending meter-scale sedimentary cycle in vertical together with the adjacent restricted-evaporative lagoon and platform flat,indicating good water circulation and a relatively high-energy open environment.
Fund:Financially supported by the National Science and Technology Major Project of China(Nos.2016ZX05004002-001,2016ZX05004006-001-002)
About author: Xi Shengli,born in 1965,holds a Ph.D. degree and is a professorial geologist. He is mainly engaged in comprehensive study of oil and gas geology. E-mail: xsl_cq@petroChina.com.cn.
Cite this article:
Xi Shengli,Xiong Ying,Liu Xianyang et al. Sedimentary environment and sea level change of the subsalt interval of Member 5 of Ordovician Majiagou Formation in central Ordos Basin[J]. JOPC, 2017, 19(5): 773-790.
Xi Shengli,Xiong Ying,Liu Xianyang et al. Sedimentary environment and sea level change of the subsalt interval of Member 5 of Ordovician Majiagou Formation in central Ordos Basin[J]. JOPC, 2017, 19(5): 773-790.
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