首页|Maturity and depositional controls on compound-specific sulfur isotope values of saline lacustrine source rocks in the north Dongpu Depression, Bohai Bay Basin

Maturity and depositional controls on compound-specific sulfur isotope values of saline lacustrine source rocks in the north Dongpu Depression, Bohai Bay Basin

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  • NSTL
  • Elsevier
Source rocks and oil sands from the northern Dongpu Depression have been analyzed by gas chromatography multicollector inductively coupled plasma mass spectrometry (GC-MC-ICP MS) to investigate the compound-specific sulfur isotope (delta S-34) values of saline lacustrine source rocks. The samples were also subject to more traditional organic geochemical analyses including hydrocarbon biomarker detection by gas chromatography/mass spectrometry (GC/MS), carbon and oxygen isotopic analysis by isotope ratio mass spectrometer, and major and trace inorganic element analysis. delta S-34(OSCs) values measured for a limited number of organic sulfur compounds (OSCs) showed a quite large range (5.16 parts per thousand-44.73 parts per thousand). The source rocks and oil sands could be separated into two groups with delta S-34 values above or below 25.00 parts per thousand. The first group with delta S-34 25.00 parts per thousand, were primarily the Weicheng source rocks, which also typically showed an increase in delta S-34 values with increasing alkylation. The second group had delta S-34 < 25.00, the delta S-34 of dibenzothiophenes showed a positive correlation with the concentration of the saturated hydrocarbon fraction of rocks, and a negative correlation with the polar (resin + asphaltene) fraction. The delta S-34(OSCs) show obvious positive correlation with gammacerane/C-31 hopane and C-35/C-34 hopanes and excellent correlation with contents of minerals and ratios of trace elements, reflecting a S-34 enrichment in closed evaporative environment (conducive to the sulfurisation of organic matter) and relative S-34 depletion in terrestrial environments. These trends identify the depositional environment of the source rocks as one of controls on delta S-34(OSCs) values. Thermal maturity was also observed to influence delta S-34(OSCs) values, becoming heavier with increasing maturity. There was a good result of oil-source rock correlation by delta(SOSC)-S-34 in this study. This study demonstrates the contribution delta S-34(OSCs) data can make to oil-oil and oil-source rock correlations as well as providing further evidence of their sensitivity to depositional environments and thermal maturity.

Dongpu depressionSaline lacustrineIsotopes of organic sulfur compoundsMajor and trace elementsMaturityDepositional environmentTHERMOCHEMICAL SULFATE REDUCTIONORGANOSULFUR COMPOUNDSTHERMAL MATURATIONSHAHEJIE FORMATIONALBERTA BASINOILSSEDIMENTARYEXPLORATIONRESERVOIRHISTORY

Ke, Changwei、Li, Sumei、Greenwood, Paul、He, Nannan、Grice, Kliti、Xu, Tianwu、Zhang, Hanjing

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China Univ Petr

Curtin Univ

SINPEC Zhongyuan Oilfield Co

2022

10.1016/j.petrol.2022.110286

Journal of Petroleum Science & Engineering

Journal of Petroleum Science & Engineering

ISSN：0920-4105
年,卷(期)：2022.212
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