Abstract The exploration of oil and gas resources in the middle-shallow strata of the Bohai Bay Basin has entered medium-high maturity stage. The Upper Paleozoic have become an important target for exploring and discovering potential oil and gas resources. The study of stratigraphy,sedimentary facies and evolution of the Upper Paleozoic strata has a certain guiding significance for oil and gas exploration. In this study,guided by the theory of sedimentology,the Upper Paleozoic outcrop profile of Shimenzhai in Qinhuangdao was investigated in detail. The lithological characteristics,stratigraphic succession and sedimentary facies types were identified and the sedimentary evolution process was clarified. The results revealed that the Upper Paleozoic strata in Shimenzhai of Qinhuangdao consisted of Benxi Formation,Taiyuan Formation,Shanxi Formation,Xiashihezi Formation,Shangshihezi Formation and Shiqianfeng Formation from bottom to top. Six types of sedimentary facies,including tidal flat,lagoon,barrier island,platform,shallow water delta and fluvial facies were identified. Tidal flat,lagoon,barrier island and platform facies developed in the Benxi-Taiyuan Formations. Shallow water delta facies developed in the Shanxi Formation, whereas fluvial facies developed in the Xiashihezi,Shangshihezi and Shiqianfeng Formations. The Upper Paleozoic strata of the study area underwent a sedimentary evolution process from marine facies,marine-continental transitional facies to continental facies.
Fund:Financially supported by National Science and Technology Major Project of China(No.2016ZX05006-007)
About author: Yan Ji-Hua,born in 1977,is an associate professor in geosciences,China University of Petroleum(East China). He is mainly engaged in researches on sedimentology and sequence stratigraphy. E-mail: upcyanjihua@sina.com.
Cite this article:
Yan Ji-Hua,Chang Jia,Chen Shi-Yue et al. Sedimentary characteristics and evolution of the Upper Paleozoic strata in Qinhuangdao area[J]. JOPC, 2019, 21(5): 743-756.
Yan Ji-Hua,Chang Jia,Chen Shi-Yue et al. Sedimentary characteristics and evolution of the Upper Paleozoic strata in Qinhuangdao area[J]. JOPC, 2019, 21(5): 743-756.
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