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Geochemical characteristics and families of the Paleozoic oil seepage and solid bitumen in the Southern Guizhou Depression, SW China

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Abstract

Fifteen oil seepage and solid bitumen samples in the Southern Guizhou Depression were analyzed with GC–MS. Characteristics of molecular markers and carbon isotopes are discussed systemically. The results showed that the oil seepage and solid bitumen samples in the Southern Guizhou Depression could be divided into two families: Ordovician and Siluric samples, and Permian samples. The two families are different in alkanes distribution, biomarkers, aromatic hydrocarbon composition, and stable carbon isotopes; differences mainly caused by source rock variation.

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Acknowledgments

We thank Dr Jin Zhijun, Dr Liu Dongsheng, and Zhou Dikang for their help with outcrop investigations; and two anonymous reviewers for comments and suggestions. This work was funded by the State Key Project of Petroleum (2008ZX05005-001-009HZ), the National Natural Science Foundation of China (41172126), the State Key Laboratory of Petroleum Resources and Prospecting (PRP2010-01) and the Science Foundation of China University of Petroleum (LLYJ-2011-05 and KYJJ-2012-01-01).

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Correspondence to Ningxi Li.

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Li, N., Wang, G., Gao, B. et al. Geochemical characteristics and families of the Paleozoic oil seepage and solid bitumen in the Southern Guizhou Depression, SW China. Chin. J. Geochem. 34, 85–92 (2015). https://doi.org/10.1007/s11631-014-0023-5

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