俄罗斯新大高加索地区油田伴生气的地球化学和碳同位素特征

IF 1.8 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Petroleum Geology Pub Date : 2022-06-23 DOI:10.1111/jpg.12822

N. Oblasov, I. Goncharov, A. Derduga, I. Kunitsyna

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引用次数: 2

摘要

大高加索西北部及其周边地区的石油生产历史悠久，可以追溯到19世纪中期。然而，石油和天然气的来源仍然存在争议。本文重点研究了大高加索西部以北的一个研究区，该研究区涵盖了库班盆地西部和东部以及邻近的构造高点，在这些构造高点中，石油和天然气分布在第三纪、古近纪、白垩纪和侏罗纪的储层单元中。该研究基于对16个油田21个伴生气样品的有机地球化学和稳定碳同位素分析结果。研究了气体样品的组成以及C1至C5烷烃的δ13C值。其中20个气体样品来源于产热性，1个混合（产热性和次生微生物）。所有天然气样品的CH4δ13C值在-62.3‰至30.0‰的大范围内变化，表明各烃源岩的热成熟度存在重大变化。

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GEOCHEMISTRY AND CARBON ISOTOPE CHARACTERISTICS OF ASSOCIATED GASES FROM OILFIELDS IN THE NW GREATER CAUCASUS, RUSSIA

The NW Greater Caucasus and surrounding areas have a long history of petroleum production dating back to the mid‐19th century. However the origin of the oil and gas is still a matter of debate. This paper focusses on a study area to the north of the western Greater Caucasus covering the West and East Kuban Basins and neighbouring structural highs where oil and natural gas occur in reservoir units of Neogene, Paleogene, Cretaceous and Jurassic ages. The study is based on the results of organic geochemical and stable carbon isotope analyses of 21 samples of associated gases from 16 oil fields. The gas samples' compositions were investigated together with the δ13C values of C1 to C5 alkanes. Twenty of the gas samples were of thermogenic origin and one was mixed (thermogenic and secondary microbial). δ13C values for CH4 for all the gas samples varied over a wide range from ‐62.3 to ‐30.0 ‰, indicating major variations in the thermal maturity of the respective source rocks.

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来源期刊

Journal of Petroleum Geology 地学-地球科学综合

CiteScore

3.40

自引率

11.10%

发文量

审稿时长

6 months

期刊介绍： Journal of Petroleum Geology is a quarterly journal devoted to the geology of oil and natural gas. Editorial preference is given to original papers on oilfield regions of the world outside North America and on topics of general application in petroleum exploration and development operations, including geochemical and geophysical studies, basin modelling and reservoir evaluation.