Recognition of the Source Rock Using Biomarkers From Eocene Reservoir Oils |
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| Authors: | X T Zhang H J Zhao Q Yu J J Hu |
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| Affiliation: | 1. The Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education , China;2. School of Energy Resources, China University of Geosciences , Beijing , China;3. Department of Geochemistry , Yangtze University , Jingzhou , Hubei , China;4. No. 1 Drilling Company, Liaohe Petroleum Exploration Bureau , Liaoning , China |
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| Abstract: | The source rocks of 20 oils in Eocene reservoir from Lengdong oil field have been evaluated using geochemical biomarkers. Most of the oil samples have been undergone light to moderate biodegradation and four of these oil samples suffered heavy biodegradation. The oils were originated from low maturity source rocks within early to middle oil window according to the thermal-maturation-dependent biomarker ratios. Source-related biomarkers indicated that the oils originated from carbonate source rock possessed both high plants and algae organic matter input, while high plants' input was dominant in almost all the oils. The source rocks concerning the oils were deposited under anoxic to suboxic (low EH), salinity to hypersaline, and lacustrine environment with deep water. |
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| Keywords: | biomarker crude oil depositional environment Lengdong oilfield source rock |
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