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- Title
Depositional Environment of E s<sub>4</sub><sup>u</sup> and E s<sub>3</sub><sup>l</sup> Shales Based on Biomarkers from the Boxing Sag of Dongying Depression, East China.
- Authors
WANG, Ying; LIU, Luofu; MENG, Jianghui; JIANG, Zhenxue; GAO, Yongjin; LIU, Shuhui
- Abstract
The Boxing Sag is located in the southwest of Dongying Depression, southern Bohai Bay Basin of East China. It is one of the main petroliferous sags in the Dongying Depression, and has two major source rocks, namely the upper 4th Member (E s4u) and lower 3rd Member (E s3l) shales of Eocene Shahejie Formation, which are the new exploration targets in recent years. In this study, 16 core samples were collected from E s4u and E s3l shales in the Boxing Sag, and the saturate hydrocarbons were analyzed by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS), respectively. The results show that E s4u shale has obvious phytane and gammacerane predominance, higher concentration of tricyclic terpanes and regular steranes, and very low concentration of 4-methly steranes; E s3l shale has pristane predominance, lower concentration of tricyclic terpanes, gammacerane and regular steranes, and higher concentration of 4-methly steranes. The E s4u shale can be further divided into two types based on the distribution of n-alkanes in gas chromatograms: normal distribution and double peak pattern. The biomarker characteristics and sedimentary facies distribution show that E s4u shale was deposited in the saline-hypersaline semi-deep (Type A E s4u shale, sag center) to shallow (Type B E s4u shale, sag edge) lacustrine environments, E s3l shale was deposited in the freshwater-brackish semi-deep-deep lacustrine environments, and the former sedimentary facies maps of E s4u and E s3l in the Boxing Sag are further modified.
- Subjects
STERANES; SHALE; BIOMARKERS; GAS chromatography/Mass spectrometry (GC-MS); SEDIMENTARY facies (Geology); LAKE hydrology
- Publication
Acta Geologica Sinica (English Edition), 2014, Vol 88, Issue 5, p1556
- ISSN
1000-9515
- Publication type
Article
- DOI
10.1111/1755-6724.12318