Gas-hydrogeochemical indicators of oil and gas potential in the Indigirka area (Eastern Yakutia)
Year: 2025
Type: article
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).
Source: Oil and Gas Studies
Authors: N. F. Chistyakova, A. I. Sivtsev
Institutions: University of Tyumen, North-Eastern Federal University
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4407890458