Formation conditions of host rocks and veins productive deposits of the Astrakhan gas-condensate field

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Abstract


This study examines one- (gas) and two-phase (aqueous solution–gas) inclusions in the calcite of the Cheremshanskian Horizon of the Bashkirian stage at a depth of 4,215–4,217 m in the Pravoberezhnaya-1 well. Homogenizing temperature is within 100–134 °C, which is likely close to the temperature of mineral formation. Calcite vein formation involves calcium bicarbonate fluid enriched in Mg chloride. It was established the calcite inclusions contain carbon dioxide, methane, and hydrogen sulfide. The gas composition of the inclusions in limestone is distiuguished of its high carbon dioxide concentration but rather low methane and hydrogen sulfide concentration.


About the authors

N. V. Sokerina

Institute of Geology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences

Author for correspondence.
Email: sokerina@geo.komisc.ru

Russian Federation, Syktyvkar

N. N. Zykin

OOO Gazprom VNIIGAZ

Email: sokerina@geo.komisc.ru

Russian Federation, Syktyvkar

S. N. Shanina

Institute of Geology, Komi Scientific Center, Ural Branch, Russian Academy of Sciences

Email: sokerina@geo.komisc.ru

Russian Federation, Syktyvkar

O. V. Valyaeva

Institute of Geology, Komi Scientific Center, Ural Branch, Russian Academy of Sciences

Email: sokerina@geo.komisc.ru

Russian Federation, Syktyvkar

S. I. Isaenko

Institute of Geology, Komi Scientific Center, Ural Branch, Russian Academy of Sciences

Email: sokerina@geo.komisc.ru

Russian Federation, Syktyvkar

M. Yu. Sokerin

Institute of Geology, Komi Scientific Center, Ural Branch, Russian Academy of Sciences

Email: sokerina@geo.komisc.ru

Russian Federation, Syktyvkar

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