Compositional heterogeneity of crude oil and its origin in the Linnan subsag, Linyi County, Shandong Province |
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| Authors: | Xiangchun Chang Yunge Duan Qingchun Chen Lixin Ma |
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| Institution: | [1]School of Geo-information Science and Engineering, Shandong University of Science and Technology, Qingdao 266510, China [2]Linpan Production Plant ofShenli Oilfield Company, SINOPEC, Linyi 251507, China |
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| Abstract: | The Linnan subsag is the main oil producer of the Linpan oil zone. Based on the oil group composition,gas chromatography data and biomarker analysis,it was indicated that crude oils from different oilfields varied greatly in group composition and showed obvious heterogeneities in the aspects of precursor type,crude oil maturity and hydrocarbon depositional environment. According to the characteristics of source rocks,three oil populations can be distinguished,i.e.,the southern,northern and transitional oil populations. Furthermore,on the basis of post-reservoir reworking processes,the medium conditions of hydrocarbon-generating environment and differences in maturity,six oil families and twelve sub-families were distinquished. An integrated study suggested that the fac-tors leading to such heterogeneities in crude oil composition mainly include different source rocks,multi-stage oil/gas charging,geo-chromatographic effects during oil/gas migration,reservoir heterogeneities and various post-reservoir secondary alterations. |
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| Keywords: | crude oil compositional heterogeneity crude oil population source rock type maturity multi-stage oil charging reservoir heterogeneity secondary alteration |
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