Lithofacies Characteristics, Depositional Environment and Sequence Stratigraphic Framework in the Saline Lacustrine Basin-A Case Study of the Eocene Low Member of Xingouzui Formation, Jianghan Basin, China

Xiaojie Fan, Yongchao Lu (), Jingyu Zhang, Shiqiang Wu, Liang Zhang, Xiaojuan Du, Qinyu Cui and Hao Wang
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Xiaojie Fan: School of Earth Resources, China University of Geoscience, Wuhan 430074, China
Yongchao Lu: School of Earth Resources, China University of Geoscience, Wuhan 430074, China
Jingyu Zhang: Centre for Marine Magnetism (CM2), Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Shiqiang Wu: Exploration and Development Research Institute, Sinopec Jianghan Oilfield Company, Wuhan 430074, China
Liang Zhang: Exploration and Development Research Institute, Sinopec Jianghan Oilfield Company, Wuhan 430074, China
Xiaojuan Du: Exploration and Development Research Institute, Sinopec Jianghan Oilfield Company, Wuhan 430074, China
Qinyu Cui: School of Earth Resources, China University of Geoscience, Wuhan 430074, China
Hao Wang: School of Marine Science and Technology, China University of Geoscience, Wuhan 430074, China

Energies, 2022, vol. 15, issue 17, 1-17

Abstract: The Jianghan Basin is a lacustrine basin in central China developing multiple salt bearing deposits in the Eocene with the success of shale oil exploration in the Qianjiang Formation. The lower member of the Xingouzui Formation in the Chentuokou Depression has become another exploration target. However, rapid changes in lithofacies and strong sedimentary heterogeneity limit the exploration progress. This study aimed to explore the sequence division, lithofacies characteristics, and sedimentary environment using sedimentological, X-ray fluorescence (XRF) and X-ray diffraction (XRD) analyses. The sequence stratigraphic analysis indicates that the low member of the Xingouzui Formation is divided into two third-order sequences, namely SQ 1 and SQ 2 , and four system tracts, including highstand systems tract (HST), lake expanding system tract (EST), early highstand system tract (EHST), and late highstand system tract (LHST). Moreover, a total of nine major lithofacies and five lithofacies associations (LA1-5) were identified. The organic geochemical data show that the laminated argillaceous dolomite in EST and EHST developed the best oil content with an average TOC of 1.18% and S 1 of 3.18 mg/g, The laminated argillaceous dolomite deposited in anoxic conditions with a humid climate, moderate salinity, and stratified deep waterbody is a favorable exploration facies for shale oil.

Keywords: sequence; lithofacies; sedimentary environment; shale oil; Jianghan Basin (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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