Stable carbon and sulfur isotope distributions of crude oil and source rock constituents from Burgan and Raudhatain oil fields (Kuwait)

Chemical Geology: Isotope Geoscience section Pub Date : 1991-04-05 DOI:10.1016/0168-9622(91)90012-L

Brian W. Robinson, Alfred V. Hirner , Graeme L. Lyon

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引用次数: 9

Abstract

Seven crude oils and ten possible source rocks from Kuwait have been investigated for the stable carbon and sulfur isotopic compositions of chromatographic oil and extract fractions, asphaltenes, kerogen, carbonates and S-bearing minerals. The crudes are isotopically very similar and suggest a single organic source. They also show characteristics intermolecular isotopic distribution patterns.

On the basis of the criteria: organic richness [extractable organic matter-total organic carbon (EOM-TOC) relationships], carbon and sulfur isotopic similarities of oils, extracts, pyrite and kerogen, samples from the Ratawi Formation (Raudhatain oil field) and the Minagish Formation (Burgan oil field) showed indications of source potential. The excellent isotopic correlations with the sample from the Mauddud Formation (Raudhatain oil field) are explained by impregnation of rock samples by reservoir oil. In the core samples, an increase in the organic matter content is correlated with¹³C enrichment in the carbonates.

The results demonstrate the potential of stable carbon and sulfur isotope correlation methods in geochemical hydrocarbon exploration.

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科威特Burgan和Raudhatain油田原油和烃源岩组分稳定碳硫同位素分布

对来自科威特的7种原油和10种可能的烃源岩进行了色谱油和萃取物组分、沥青质、干酪根、碳酸盐和含硫矿物的稳定碳和硫同位素组成的研究。原油同位素特征非常相似，表明有机质来源单一。它们还显示出分子间同位素的特征分布模式。根据有机质丰度[可萃取有机质-总有机碳(EOM-TOC)关系]、油、提物、黄铁矿、干酪根碳硫同位素相似性等指标，拉塔维组(Raudhatain油田)和米纳吉什组(Burgan油田)样品显示出烃源潜力指示。Raudhatain油田Mauddud组样品具有良好的同位素相关性，解释了储层油对岩石样品的浸渍作用。岩心样品中有机质含量的增加与碳酸盐中13c的富集有关。结果表明，稳定碳硫同位素对比方法在地球化学油气勘探中的应用潜力巨大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Chemical Geology: Isotope Geoscience section

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