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  Oil Shale

ISSN 1736-7492 (electronic)  ISSN 0208-189X (print)
Published since 1984

Oil Shale

ISSN 1736-7492 (electronic)  ISSN 0208-189X (print)
Published since 1984
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ORGANIC GEOCHEMICAL CHARACTERISTICS OF THE BILONG CO OIL SHALE (CHINA): IMPLICATIONS FOR PALEOENVIRONMENT AND PETROLEUM PROSPECTS; pp. 398–414
(Full article in PDF format)   doi: 10.3176/oil.2011.3.04


Authors

YUHONG ZENG, XIUGEN FU, SHENGQIANG ZENG, GU DU, JIANG CHEN, QIAN ZHANG, YIRONG ZHANG, YANLING YAO

Abstract

The Bilong Co oil shale is located in the southern part of the Qiangtang basin. This oil shale zone, together with the Shengli River-Changshe Mountain oil shale zone in the northern part of the Qiangtang basin, represents a large marine oil shale resource in China. An organic geochemical investigation of the oil shale was performed to reconstruct paleoenvironment during deposition and to assess petroleum prospects. The TOC content (6.75–19.2 wt.%) and S2 values (5.96–70.2 mg HC/g rock) of oil shale samples from the Bilong Co area are relatively high indicating that the oil shale from the Bilong Co area has shale oil producing potential. The thermal maturity assessed from Tmax and other maturity-related parameters (Ts/(Ts+Tm), C32Hop S/(S+R), C29St S/(S+R), and C29St ββ/(αα+ββ)) shows a mature stage of the organic matter. Analyzed oil shale samples from the Bilong Co area are characterized by a dominance of low carbon number molecular compositions with relatively high C21-/C21+ (0.82–1.95), low Pr/Ph (0.13–0.80), high concentrations of homo­hopanes (C31-C35), and a slight predominance of C29 steranes, indicating reduc­ing environments, highly saline conditions, a strong contribution of inferior aquatic organisms, and some influence of terrestrial organic matter. Highly similar biomarker characteristics between the Bilong Co oil shale and nearby Zharen-Longeni crude oil in the southern Qiangtang depression suggest that the oil shale from the Bilong Co area has made a strong contribu­tion to the generation of Zharen-Longeni crude oil.



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