Lithofacies palaeogeographic characteristics and evolution of the Ordovician in western Shandong-eastern Henan area
JIA Yanyu1,2, SU Yuchi3,4, SUI Shaoqiang1,2, JIA Weiming3,4, LI Zongfeng3,4, YANG Zhibo3,4, WANG Xi1,2, GAO Fei1,2, JI Hancheng3,4, BAO Zhidong3,4
1 Star(Beijing)New Energy Research Institute Co. Ltd.,SINOPEC, Beijing 100083,China; 2 Key Laboratory of Geothermal Exploration and Utilization,SINOPEC,Beijing 100083,China; 3 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249,China; 4 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China
Abstract The Ordovician carbonate strata in western Shandong-eastern Henan represent important oil and hot water reservoirs. Limited by the basic geological data,there is controversy over sequence classification of Ordovician carbonate in western Shandong-eastern Henan,the lack of detailed investigation of sedimentary facies and lithofacies palaeogeography. Through the field geological profile investigation of the perimeter of the study area,the core observation of 19 wells in the study area and the analysis of the shape of the logging curve,the lithofacies palaeogeography of Ordovician and its evolution characteristics in the study area were reconstructed,in order to clarify the characteristics of sequence stratigraphy and lithofacies palaeogeography feature in each period of the Ordovician in the study area. Results from the current study suggest that according to the sequence boundaries and the output position of the maximum flooding surface,the Ordovician sedimentary strata were divided into two second-order sequences of SSQ1-SSQ2 and four third-order sequences of SQ1-SQ4. The Ordovician carbonate strata of study area were formed in the marine carbonate platform sedimentary environments,including three subfacies,including restricted platform,open platform and evaporate platform. They were further subdivided into eight sedimentary microfacies,including carbonate flat,grain beach,muddy carbonate flat,carbonate-dolomite flat,dolomite flat,lagoon,gypsum-dolomite flat and gypsum-bearing dolomite flat. The lithofacies palaeogeographic units of SQ1-SQ4 show the sedimentary construction characteristics of land surface seas as a whole,and seawater mainly inflows from the northeast. Dolomite flat,gypsum-dolomite flat,gypsum-bearing dolomite flat,and grain beach microfacies are favorable for the formation of reservoir space,which are the focused areas of regional hydrocarbon and hot water exploration and development.
Fund:Co-funded by the Key Scientific and Technological Project of Sinopec(No. JP21005)and National Key Research and Development Program of China(Nos. 2017YFC0603104,2018YFC0604304)
Corresponding Authors:
SU Yuchi,born in 1994. He is mainly engaged in sedimentology and analysis in petroliferous basins, geothermal resources analysis and evaluation. E-mail: 1219133033@qq.com. JIA Weiming,born in 1998. He is mainly engaged in sedimentology and geothermal resource exploration. E-mail: 1522043579@qq.com.
About author: JIA Yanyu,born in 1988,is a senior engineer. He is mainly engaged in unconventional oil and gas geology,geothermal geology and new energy strategic planning. E-mail: jiayanyu2007@163.com.
Cite this article:
JIA Yanyu,SU Yuchi,SUI Shaoqiang et al. Lithofacies palaeogeographic characteristics and evolution of the Ordovician in western Shandong-eastern Henan area[J]. JOPC, 2023, 25(1): 133-148.
JIA Yanyu,SU Yuchi,SUI Shaoqiang et al. Lithofacies palaeogeographic characteristics and evolution of the Ordovician in western Shandong-eastern Henan area[J]. JOPC, 2023, 25(1): 133-148.
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