Organic geochemistry characterization of the Yan 9 crude oils and oil-source rock correlations in Jingbian Oil Field,Ordos Basin |
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Authors: | Yubin Bai Hai Zhang |
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Affiliation: | 1. School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an, Shaanxi, China;2. Jingbian oil Production, Yanchang Oilfield Corporation, Yulin, Shaanxi, China |
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Abstract: | The geochemical characteristics of the Yan 9 reservoir were analyzed by means of the group composition and the biomarkers in order to clarify the oil source of the Yan 9 reservoir in Jingbian Oil Field. The results showed that the n-alkanes are distributed with a single mode with C21 as the main carbon peak, C30hopane as the dominant biomarker, followed by C29hopane. Regular steroids are mainly C29, while C27 and C28 are similar, showing an asymmetric “V” distribution. The Yan 9 crude oil has similar geochemical characteristics and unified material source and evolution degree. It is a mature crude oil derived from a source deposited in a weak oxidation-reduction environment under freshwater conditions. Oil-source correlation showed that the reservoir of Yan 9 mainly comes from the contribution of Chang 7 hydrocarbon source rock in Jingbian Oil Field. |
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Keywords: | Chang 7 source rock crude oil geochemistry Jingbian Oil Field oil-source correlation Ordos Basin Yan 9 crude oil |
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