TY - JOUR

T1 - Equilibrium modeling of water-gas systems in Jurassic–Cretaceous reservoirs of the Arctic petroleum province, northern West Siberia

AU - Novikov, Dmitry Anatolievich

N1 - Funding Information: Received date: 17 May 2021; Revised date: 08 Feb. 2022. * Corresponding author. E-mail: NovikovDA@ipgg.sbras.ru Foundation item: Supported by the Ministry of Science and Education of the Russian Federation, No. FWZZ-2022-0014 “Digital models for hydrogeology and hydrogeochemistry of the oil and gas bearing basins in the Arctic and eastern territories of Siberia, including the Republic of Sakha (Yakutia)” and by the Russian Foundation for Basic Research (Project 18-05-70074 “Arctic Resources”). https://doi.org/10.1016/S1876-3804(22)60030-2 Copyright © 2022, Research Institute of Petroleum Exploration & Development, PetroChina. Publishing Services provided by Elsevier B.V. on behalf of KeAi Communications Co., Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Publisher Copyright: © 2022 Research Institute of Petroleum Exploration & Development, PetroChina

PY - 2022/4

Y1 - 2022/4

N2 - To reveal the equilibrium state of oil and gas and water in a petroliferous basin with a high content of saline water, calculations of water-gas equilibrium were carried out, using a new simulation method, for the Arctic territories of the West Siberian oil and gas bearing province. The water-bearing layers in this area vary widely in gas saturation and have gas saturation coefficients (Cs) from 0.2 to 1.0. The gas saturation coefficient increases with depth and total gas saturation of the formation water. All the water layers with gas saturation bigger than 1.8 L/L have the critical gas saturation coefficient value of 1.0, which creates favorable conditions for the accumulation of hydrocarbons; and unsaturated formation water can dissolve gas in the existent pool. The gas saturation coefficient of formation water is related to the type of fluid in the reservoir. Condensate gas fields have gas saturation coefficients from 0.8 to 1.0, while oil reservoirs have lower gas saturation coefficient. Complex gas-water exchange patterns indicate that gas in the Jurassic–Cretaceous reservoirs of the study area is complex in origin.

AB - To reveal the equilibrium state of oil and gas and water in a petroliferous basin with a high content of saline water, calculations of water-gas equilibrium were carried out, using a new simulation method, for the Arctic territories of the West Siberian oil and gas bearing province. The water-bearing layers in this area vary widely in gas saturation and have gas saturation coefficients (Cs) from 0.2 to 1.0. The gas saturation coefficient increases with depth and total gas saturation of the formation water. All the water layers with gas saturation bigger than 1.8 L/L have the critical gas saturation coefficient value of 1.0, which creates favorable conditions for the accumulation of hydrocarbons; and unsaturated formation water can dissolve gas in the existent pool. The gas saturation coefficient of formation water is related to the type of fluid in the reservoir. Condensate gas fields have gas saturation coefficients from 0.8 to 1.0, while oil reservoirs have lower gas saturation coefficient. Complex gas-water exchange patterns indicate that gas in the Jurassic–Cretaceous reservoirs of the study area is complex in origin.

KW - Arctic petroleum province

KW - hydrocarbon accumulations

KW - Jurassic–Cretaceous oil reservoir

KW - water-gas system

KW - West Siberia

UR - http://www.scopus.com/inward/record.url?scp=85128285566&partnerID=8YFLogxK

U2 - 10.1016/S1876-3804(22)60030-2

DO - 10.1016/S1876-3804(22)60030-2

M3 - Article

AN - SCOPUS:85128285566

VL - 49

SP - 363

EP - 373

JO - Petroleum Exploration and Development

JF - Petroleum Exploration and Development

SN - 1876-3804

IS - 2

ER -