High-frequency cyclic sequence of the Ma56 submember of Middle Ordovician Majiagou Formation in Ordos Basin: indication for sea-level change and sedimentary differentiation effect of Hengshan uplift
Zhong Shou-Kang1,2, Tan Xiu-Cheng1,2, Nie Wan-Cai3,4, Zhang Dao-Feng3, Yang Meng-Ying1,2, Lu Zi-Xing3, Zhang Xin-Yue1,2, Xiao Di1,2
1 Research Branch of Southwest Petroleum University,Key Laboratory of Carbonate Reservoirs,CNPC,Chengdu 610500,China; 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China; 3 Research Institute of Exploration and Development,Changqing Oilfield Company of PetroChina,Xi'an 710021,China; 4 Yihuang Natural Gas Project Department,Changqing Oilfield Company of PetroChina,Yan'an 716000,China
Abstract Studies in high-frequency cyclic sequence is helpful to reveal much sedimentary information,such as sea-level changes,deposition response and palaeogeographic evolution during depositional stage of shallow carbonate platform,and their impacts on the sedimentary differentiation in the basin. Based on the rich drilling core data,the lithology characteristics and typical fifth-order cyclic sequence of the Ma56 submember of Middle Ordovician Majiagou Formation are studied. The results indicate that(1)5 types(Ⅰ~Ⅴ)of typical T-R single cycle have been identified based on the 9 rock types of symbiotic combination of carbonates and evaporites. The cycles of Ⅰ,Ⅱ and Ⅲ are characterized by dolomitic sediments of lagoon-shoal-mud mound,while cycles of Ⅳ and Ⅴ are characterized as gypsum-salt sediments of lagoon. The fifth-order high-frequency cyclic structural sections have been established according to the 5 types of single cycle;(2)Fischer plot established according to the fifth-order high-frequency cyclic sections indicates that the Ma56 submember developed in the late stage of the third-order cycle,which comprises 2 fourth-order cycles representing the trend of initial regression-rapid transgression-another regression;(3)the thickness statistics of fifth-order cycles shows that the development of uplift and depression corresponds to the period of the first fourth-order cycle. The Hengshan uplift was the depositional highland,which isolated the seawater between the west and east sides. During the second fourth-order cycle period,filling and leveling up weakened the impact of Hengshan uplift,promoting the seawater circulation and the salinity at the east and west sides of the uplift decreased. The study on the high-frequency cycles of the Ma56 submember has been well applied in the analysis of stratigraphy and sedimentology of the Ma56 submember in the Hengshan area,which can be further applied in the Majiagou Formation in the Ordos Basin.
Fund:China National Petroleum Corporation upstream field basic forward-looking project(No.2021DJ0501)
Corresponding Authors:
Tan Xiu-Cheng,born in 1970,is a professor and Ph. D. advisor of Southwest Petroleum University. He is mainly engaged in researches on carbonate sedimentology and reservoir geology.E-mail: tanxiucheng70@163.com。
About author: Zhong Shou-Kang,born in 1995,is a Ph.D. candidate in Southwest Petroleum University. He is mainly engaged in researches on carbonate and evaporite sedimentology. E-mail: zhongsk95@163.com。
Cite this article:
Zhong Shou-Kang,Tan Xiu-Cheng,Nie Wan-Cai et al. High-frequency cyclic sequence of the Ma56 submember of Middle Ordovician Majiagou Formation in Ordos Basin: indication for sea-level change and sedimentary differentiation effect of Hengshan uplift[J]. JOPC, 2022, 24(2): 245-260.
Zhong Shou-Kang,Tan Xiu-Cheng,Nie Wan-Cai et al. High-frequency cyclic sequence of the Ma56 submember of Middle Ordovician Majiagou Formation in Ordos Basin: indication for sea-level change and sedimentary differentiation effect of Hengshan uplift[J]. JOPC, 2022, 24(2): 245-260.
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