Application of organic sulfur isotopic composition to petroleum origin and evolution:A review

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  • 1.Key Lab of Petroleum Resources,Institute of Geology and Geophysics,CAS,Beijing 100029,China;
    2.College of Earth Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

Received date: 2017-11-01

  Revised date: 2018-01-30

  Online published: 2018-02-10

Abstract

Organic sulfur geochemistry was poorly understood until significant advances in sulfur contents and isotopic composition measurement methods recently,however,few systematical review and summary has been published.This paper is to review the advance in the origin of organic sulfur in sediment and its application to petroleum origin and evolution.(1)Organic sulfur isotopic compositions are found to show a secular change with its depositional ages roughly parallel to the seawater sulfate δ34S-age trend;(2)organic sulfur compounds can be newly generated in the petroleum reservoirs by incorporating H2S of an origin of bacterial sulfate reduction (BSR)or thermochemical sulfate reduction (TSR)into hydrocarbons.TSR-altered petroleum contains high thiadiamondoids and has bulk and individual compounds δ34S values close to those of anhydrite in the reservoirs.In contrast,BSR-altered oils contain no detectable thiadiamondoids and have lightest bulk and individual compound δ34S values in the oil with the highest sulfur content.Thus BSR-altered oils can be distinguished from TSR-altered ones;(3)organic sulfur isotopic compositions can be used for oil-source rock and solid bitumen-source rock correlation purposes only for oils and solid bitumen not altered by BSR or TSR and for source rocks which were rapidly buried during oil generation and cracking.Tarim Basin was rapidly buried and hydrocarbon was generated during the Cambrian to Ordovician,among which a part of oils not altered by TSR show bulk δ34S values from +14.8‰ to +23.3‰ (n=16)and averaged DBTs from +13.5‰ to +21.6‰ (n=6),being close to those of kerogens from the Lower Cambrian source rocks (from +10.4‰ to +21.6‰,n=15).Based on these results along with carbon isotopes and biomarkers,these oils are considered to have been derived from the Lower Cambrian.The other case from the Northeast Sichuan Basin,where non-TSR altered solid bitumens in the Changxin and Feixianguan formations show δ34S and δ13C values from +5.8‰ to +9.6‰ and from -25.1‰ to -27.3‰,respectively,and there is no detectable aryl isoprenoids in the extractable organic matter.These features are well correlated with Upper Permian Longtan Fm.mudstone source rock in the Bazhong-Dazhou area,suggesting that the oil prior to being cracked to the solid bitumen and natural gases were derived from Longtan Formation.These results show that organic sulfur may have a good application prospect.

Cite this article

Cai Chun-fang . Application of organic sulfur isotopic composition to petroleum origin and evolution:A review[J]. Natural Gas Geoscience, 2018 , 29(2) : 159 -167 . DOI: 10.11764/j.issn.1672-1926.2018.01.013

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