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Ahead of Print Abstract
DOI:10.1306/02132422124
Recognition of a hydrothermally-linked oil accumulation process in the Tahe Oilfield, NW China, with organic geochemistry, Re-Os and U-Pb geochronology
Shaojie Li12 , Xiaowen Guo1 , Bin Wang3 , Zicheng Cao4 , Hao Xu1 , and Jiaxu Chen1
1 Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan, 430074, China
2 School of Geosciences, Yangtze University, Wuhan 430100, China
3 Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi 214126, China
4 Northwest Oilfield Company, SINOPEC, Urumqi 830011, China
Ahead of Print Abstract
The Tahe Oilfield is one of the largest deeply-buried, multistage-charged Palaeozoic oilfields in the Tarim Basin, NW China. Understanding the temporal evolution of Palaeozoic oils is crucial for petroleum prospecting in this region. In this study, a combination of biomarker analysis, stable/radiogenic isotopic analysis, rhenium-osmium (Re-Os) and uranium-lead (U-Pb) isotope geochronology is utilized to constrain the timing of oil accumulation in the Tahe Oilfield. Coexistence of UCM (unresolved complex mixture) and intact n-alkane series in oil chromatograms suggests the presence of multistage oil accumulation processes in the studied area, and paleo-biodegradation occurred prior to the latest oil charge. Biomarker data show that the source rock for the latest accumulated oils was deposited in a marine reducing-weakly oxidizing environment. An early Permian oil generation event (276 ± 35 Ma) was suggested by Re-Os geochronology. This oil generation event is responsible for the late Permian-Late Triassic charge event (259.9–224.1 Ma), which is identified with in-situ U-Pb isotopic analysis of calcites containing primary oil inclusions. These age data provide direct temporal constraints for the latest oil accumulation in the Tahe Oilfield. Furthermore, C-O-Sr-Os isotopic results show that hydrothermal fluid flowed during this oil accumulation event. Outcomes of this study unravel that Re-Os isotopic analysis of cogenetic crude oils has the potential of direct dating the latest, hydrothermally-linked oil accumulation in multistage-charged deep oil reservoirs.
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