Gas-hydrogeochemical indicators of oil and gas potential in the Indigirka area (Eastern Yakutia)
https://doi.org/10.31660/0445-0108-2025-1-50-68
Abstract
This study is relevant due to the need for a comprehensive assessment of the gashydrogeochemical characteristics of Mesozoic-Cenozoic deposits in the Indigirka area, based on data collected from exploration wells tested between 1989 and 1990.
The aim of this study is to elucidate the origin of water and gas fluids in MesozoicCenozoic deposits as a result of the catagenetic transformation of organic matter from contemporaneous oil and gas source rocks.
The various methods were used in this study, including the universal method of geological analysis of the obtained data.
Key results. Groundwater from Neogene deposits (Kyllakh suite) is classified as sulfatesodium and bicarbonate-sodium types of elision genesis. Groundwater from Paleogene deposits (Darkylakh Suite) is categorized as the bicarbonate-sodium type, while groundwater from Mesozoic deposits (Upper Jurassic – Bastakh Suite) is also classified as the bicarbonate-sodium type. These classifications confirm that Mesozoic-Cenozoic deposits are within catagenesis stage intervals. Water-soluble natural gases are characterized by a "dry" hydrocarbon type in the Darkylakh suite and a "fatty" type in the Bastakh suite. This indicates that the clayey rocks of the Mesozoic deposits could serve as potential oil and gas source rocks.
The presence of elision genesis waters, along with the qualitative and quantitative composition of WSNGs, reflects the initial stage of hydrocarbon potential realization in Upper Jurassic deposits and the potential for forming oil reservoirs in Mesozoic deposits if suitable natural reservoirs exist and are sealed by fluid traps.
The results can be used for evaluating the oil and gas potential of Mesozoic-Cenozoic deposits in the Indigirka area (Eastern Yakutia).
About the Authors
N. F. Chistyakova
University of Tyumen
Russian Federation
Russian Federation
Nelly F. Chistyakova, Doctor of Geology and Mineralogy, Professor at the Department of Geoecology and Nature
Management of The School of Natural Sciences
Tyumen
A. I. Sivtsev
North-Eastern Federal University
Russian Federation
Russian Federation
Aleksei I. Sivtsev, Candidate of Geology and Mineralogy, Associate Professor at the Department of Subsoil Use
Yakutsk
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Review
For citations:
Chistyakova N.F., Sivtsev A.I. Gas-hydrogeochemical indicators of oil and gas potential in the Indigirka area (Eastern Yakutia). Oil and Gas Studies. 2025;(1):50-68. (In Russ.) https://doi.org/10.31660/0445-0108-2025-1-50-68
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