油气勘探

西西伯利亚盆地北极油气区侏罗系—白垩系储集层气-水系统平衡模拟

  • NOVIKOV Dmitry Anatolievich
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  • 1.俄罗斯科学院西伯利亚分校Trofimuk石油地质和地球物理研究所,新西伯利亚 630900,俄罗斯;
    2.俄罗斯新西伯利亚国立大学,新西伯利亚 630900,俄罗斯
NOVIKOV Dmitriy Anatolievich(1976-),男,俄罗斯人,博士,俄罗斯新西伯利亚州立大学副教授,主要从事沉积盆地油气藏地下水和水溶气同位素地球化学特征及“水-岩-气-有机质”系统演化研究。地址:Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch Russian Academy of Sciences (IPGG SB RAS), 630090, Novosibirsk, Russia, Koptug ave. 3。E-mail:NovikovDA@ipgg.sbras.ru

收稿日期: 2021-05-17

  网络出版日期: 2022-03-16

基金资助

俄罗斯基础研究计划“西伯利亚北极盆地地下水化学、成因和形成机制”(031-2019-2525); 俄罗斯基础研究基金“北极资源”项目(18-05-70074)

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

  • NOVIKOV Dmitry Anatolievich
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  • 1. Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences, Avenue Koptyuga, 3, Novosibirsk 630090, Russia;
    2. Novosibirsk State University, Str. Pirogova, 1, Novosibirsk 630090, Russia

Received date: 2021-05-17

  Online published: 2022-03-16

摘要

为揭示盐水含量较高的含油气盆地中油气和地下水之间的相平衡,采用新的气-水平衡模拟软件对西西伯利亚盆地北极含油气区进行模拟。研究发现,该区域地层水的含气饱和度(Sg)变化较大,饱和系数(Cs)为0.2~1.0,其数值随深度及地层水总含气饱和度的增加而增大。地层水Sg大于1.8 L/L的情况下,气体饱和系数(Cs)均达到临界值1.0,为油气成藏创造了有利条件;而欠饱和水可溶解现有油气藏中的天然气。地层水气体饱和系数与储集层流体类型有关,凝析油气田的气体饱和系数主要为0.8~1.0,而在常规油藏中却相对较低。复杂的气水交换模式表明研究区侏罗系—白垩系储集层中天然气来源具有多样性。

本文引用格式

NOVIKOV Dmitry Anatolievich . 西西伯利亚盆地北极油气区侏罗系—白垩系储集层气-水系统平衡模拟[J]. 石油勘探与开发, 2022 , 49(2) : 319 -329 . DOI: 10.11698/PED.2022.02.10

Abstract

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.

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