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Abstract <p>Field studies have established that methane concentrations in free, adsorbed, and dissolved gas samples of Upper Quaternary deposits and surface strams of the Pereyaslavsky graben in the Middle Amur sedimentary basin vary within the range of 0.6–19 088.4, 1.8–9.5, and 2.3–115.0 × 10<sup>–4</sup>%, with the totals of methane homologues, respectively, being 0.00–0.84, 0.29–5.71, and 0.01–0.20 × 10<sup>–4</sup>%. Calculation and interpretation of gas-geochemical indicators have made it possible to identify ten genetic groups of indigenous sources of hydrocarbon gases, including migrating gases of oil, gas, and condensate accumulations. A comprehensive interpretation of gas-geochemical and geological-geophysical data showed that the distribution of hydrocarbon gases is jointly controlled by the main factors of gas accumulation, i.e., geological structure, fold and fault tectonics, coal- and oil-bearing capacity, and bituminosity of rock complexes. A geotectonic and gas-geochemical assessment of the hydrocarbon potential of the study area was carried out.</p>

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Geotectonic Aspects of the Hydrocarbon Gas Distribution and Hydrocarbon Potential of the Pereyaslavsky Graben in the Middle Amur Sedimentary Basin

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • E. P. Razvozzhaeva,
  • A. I. Gresov,
  • A. V. Yatsuk,
  • P. N. Prokhorova,
  • D. A. Shvalov

摘要

Abstract

Field studies have established that methane concentrations in free, adsorbed, and dissolved gas samples of Upper Quaternary deposits and surface strams of the Pereyaslavsky graben in the Middle Amur sedimentary basin vary within the range of 0.6–19 088.4, 1.8–9.5, and 2.3–115.0 × 10–4%, with the totals of methane homologues, respectively, being 0.00–0.84, 0.29–5.71, and 0.01–0.20 × 10–4%. Calculation and interpretation of gas-geochemical indicators have made it possible to identify ten genetic groups of indigenous sources of hydrocarbon gases, including migrating gases of oil, gas, and condensate accumulations. A comprehensive interpretation of gas-geochemical and geological-geophysical data showed that the distribution of hydrocarbon gases is jointly controlled by the main factors of gas accumulation, i.e., geological structure, fold and fault tectonics, coal- and oil-bearing capacity, and bituminosity of rock complexes. A geotectonic and gas-geochemical assessment of the hydrocarbon potential of the study area was carried out.