1887
PDF

Abstract

Summary

The variations of d34S values in organosulfur compounds (primarily benzo- and dibenzothiophenes) in naturally occurring oils, with increasing thermal maturation was noted by several studies in the past decade. Previous attempts to utilize the d34S values of dibenzothiophenes showed limited success due to secondary alteration of the oils (e.g. TSR), narrow range of thermal maturities covered and limited understanding of the genetic oils families within a given petroleum system.

In the present study we performed compounds specific sulfur isotopes analysis on a suite Eagle Ford oils and compared the isotopic data to previously published geochemical data and maturation indices for the same oils. These reservoirs were chosen as they share the same source rock, experienced no secondary processes and represent a range of thermal maturity degrees.

Our results demonstrate that variations in d34S values of 4-methyldibenzothiophene can effectively be used as a proxy for thermal maturity in oil samples that originated from a single facies from a given source rock. Our suggested thermal maturity proxy (?34S (4-methyldibenzothiophene – 4,6-dimethyldibenzothiophene)) minimizes the effect of the initial kerogen d34S value and allows thermal maturity comparison of oils generated from different facies of a given source.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.202533228
2025-09-07
2026-02-13
Loading full text...

Full text loading...

/deliver/fulltext/2214-4609/2025/imog-2025/228.html?itemId=/content/papers/10.3997/2214-4609.202533228&mimeType=html&fmt=ahah

References

  1. Ellis, G.S., Said-Ahmad, W., Lillis, P.G., Shawar, L., Amrani, A., 2017. Effects of thermal maturation and thermochemical sulfate reduction on compound-specific sulfur isotopic compositions of organosulfur compounds in Phosphoria oils from the Bighorn Basin, USA. Organic Geochemistry103, 63–78.
    [Google Scholar]
  2. Ke, C., Li, S., Zhang, H., He, N., Grice, K., Xu, T., Greenwood, P., 2020. Compound specific sulfur isotopes of saline lacustrine oils from the Dongpu Depression, Bohai Bay Basin, NE China. Journal of Asian Earth Sciences195, 104361.
    [Google Scholar]
  3. Radke, M., 1988. Application of aromatic compounds as maturity indicators in source rocks and crude oils. Marine and Petroleum Geology5, 224–236.
    [Google Scholar]
  4. Rosenberg, O.Y., Meshoulam, A., Said-Ahmad, W., Shawar, L., Dror, G., Reznik, J.I., Feinstein, S., Amrani, A., 2017. Study of thermal maturation processes of sulfur-rich source rock using compound specific sulfur isotope analysis. Organic Geochemistry112, 59–74.
    [Google Scholar]
  5. Walters, C.C., Gong, C., Sun, X., Zhang, T., 2023. Geochemistry of oils and condensates from t he lower Eagle Ford formation, South Texas. Part 3: Basin modeling. Marine and Petroleum Geology150, 106117.
    [Google Scholar]
  6. Zhang, T., Sun, X., Walters, C.C., Sundaram, A., Calla, J.T., 2022. Geochemistry of oils and condensates from the lower Eagle Ford formation, south Texas. Part 1: Crude assay measurements and SimDist modeling. Marine and Petroleum Geology139, 105576.
    [Google Scholar]
/content/papers/10.3997/2214-4609.202533228
Loading
/content/papers/10.3997/2214-4609.202533228
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error