Thermochemical sulfate reduction in fossil Ordovician deposits of the Majiang area: Evidence from a molecular-marker investigationReport as inadecuate




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Chinese Science Bulletin

, Volume 58, Issue 28–29, pp 3588–3594

First Online: 11 May 2013Received: 10 December 2012Accepted: 25 March 2013DOI: 10.1007-s11434-013-5843-x

Cite this article as: Wang, G., Li, N., Gao, B. et al. Chin. Sci. Bull. 2013 58: 3588. doi:10.1007-s11434-013-5843-x

Abstract

The main reservoirs of Majiang fossil deposits consist of the Silurian Wengxiang group, dominantly sandstones, and the Ordovician Honghuayuan formation, dominantly carbonate rocks, and the Lower Cambrian Niutitang Formation mudstones serve as the major source rocks. Thermochemical sulfate reduction TSR might have taken place in the Paleozoic marine carbonate oil pools, as indicated by high concentrations of dibenzothiophenes in the extracts MDBT=0.27–4.32 μg-g extract, and MDBT-MPH= 0.71–1.38. Hydrocarbons in the Pojiaozhai Ordovician carbonate reservoirs have undergone severe TSR and are characterized by higher quantities of diamondoids and MDBT and heavier isotopic values δC=−28.4‰. The very large amounts of dibenzothiophenes might be products of reactions between biphenyls and sulfur species associated with TSR.

Keywordssolid bitumen adamantane dibenzothiophene comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry GC×GC-TOFMS thermochemical sulfate reduction TSR maturation This article is published with open access at Springerlink.com

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Author: GuangLi Wang - NingXi Li - Bo Gao - XianQing Li - ShengBao Shi - TieGuan Wang

Source: https://link.springer.com/







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