The Distribution and Genesis of Hydrocarbon Gases in the Bottom Sediments of the Laptev–Siberian Sea Zone of the East Arctic Shelf

IF 0.9 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Russian Journal of Pacific Geology Pub Date : 2024-05-02 DOI:10.1134/s1819714024020040

A. I. Gresov, A. V. Yatsuk

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Abstract

Gases from bottom sediments of the Laptev–Siberian Sea zone contain methane (up to 8.3047 cm³/kg) and its homologues (up to pentane including) totaling 0.0259 cm³/kg. The established values of the carbon isotope composition of methane (δ¹³С), the molecular weight of the hydrocarbon fraction, the weight concentrations of С₁–С₅ hydrocarbons and their ratios, the “wetness” and “transformation” coefficients of the hydrocarbons fraction indicate the presence of various syngenetic and epigenetic gases in different source rocks: bottom sediments, peatlands, coal, gas, and gas hydrate? deposits, solid bitumen, igneous rocks, and inferred oil and gas reservoirs. It has been established that the vertical and lateral distribution of hydrocarbon gases in sediments depends on the influence of a complex of geological factors: fold and fault tectonics, magmatism and seismic activity in the region, coal, oil and gas potential and bitumen content, organic saturation and lithological composition, hydrogeological, geocryological, and other conditions for accumulation of gases or their degassing.

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东北极大陆架拉普捷夫-西伯利亚海区海底沉积物中碳氢化合物气体的分布和成因

摘要拉普捷夫-西伯利亚海区海底沉积物中的气体含有甲烷（最多 8.3047 立方厘米/千克）及其同系物（包括戊烷），总量为 0.0259 立方厘米/千克。甲烷的碳同位素组成（δ13С）、碳氢化合物部分的分子量、С1-С5 碳氢化合物的重量浓度及其比率、碳氢化合物部分的 "湿度 "和 "转化 "系数的既定值表明，在不同的源岩中存在各种合成和外生气体：底沉积物、泥炭地、煤、天然气和天然气水合物矿床、固体沥青、火成岩以及推断的油气藏。已经确定的是，沉积物中碳氢化合物气体的垂直和横向分布取决于一系列复杂地质因素的影响：褶皱和断层构造、该地区的岩浆活动和地震活动、煤炭、石油和天然气的潜力和沥青含量、有机饱和度和岩性组成、水文地质、地质岩石学以及气体聚集或脱气的其他条件。

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来源期刊

Russian Journal of Pacific Geology 地学-地球科学综合

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Russian Journal of Pacific Geology publishes the results of research on the Earth crust and mantle composition and provides articles on the geological structure and patterns of distribution of mineral deposits in the Pacific Ocean, marginal seas and continental margins. It discusses the topics of stratigraphy, sedimentology, magmatic activity, and seismicity. The journal deals with the problems of lithosphere plates tectonics, and offers the results of neotectonic, geomorphological, geodesic, environmental and mining studies in the Pacific region. The journal accepts theoretical, methodical and philosophical articles covering general issues of geology, geophysics, geochemistry, geoecology and mining. The journal also publishes critical notes and comments, and reviews.