Hydrocarbons Correlation and Geochemical Characterization of Kangan Formation in Wells B and C in South Pars Gas Field

Document Type : Research Paper

Abstract

Correlation means comparison of hydrocarbons with each other or with hydrocarbons from a source rock for genetical relations using geochemical analyses. For this propose generally, biomarkers and isotopical analyses are used. In this study, an extensive geochemical analyes such as Rock-Eval pyrolysis, Bitumen extraction and fractionatios, biomarkers and isotpical analyses were carried out on core rock samples collected from Shaly-Carbonate layers of Kangan Formation of wells B and C in South Pars Gas field. Rock-Eval pyrlysis and biomarkers analysis results reveal that the kerogen of samples were type II and III, indicating marine organic matter with a little terrestrial input. Chromatograms of saturate fraction of samples show no biodegradation alterations. The organic matter of these samples were derived from source rock(s), with clastic-semicarbonate lithology which deposited under anoxic to subanoxic depositional environment. The samples collected from well C, showing poor to moderate genetic potential and samples of well B has poor genetic potential. Maturity level of kerogen of both samples are in early oil generation zone (late diagenesis to early catagsnesis). Samples from well B showing slightly higher maturity level compare with that of well C. Well B samples show paraffinic-naphthenic and naphthenic hydrocarbon characterestics, were as the organic matter of well C, with paraffinic-naphthenic and paraffinic hydrocarbon properties. In spite of similarity of fingerprints and chemical characterization between wells C and B, it seems shally- carbonate layers of Kangan Formation is responsible for a negligible amount of hydrocarbon production. These layers act as a low quality source rock with poor potantiality.

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References

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Journal of Petroleum Research
Volume 19, Issue 60 - Serial Number 60
November and December 2010
Pages 84-103

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