Characteristics, main controlling factors and development mode of Paleozoic coal-formed condensate gas reservoirs in Huanghua depression, Bohai Bay Basin

被引：0

作者：

Zhao X. ^{[1
]}

Li H. ^{[1
]}

Fu L. ^{[1
]}

Cui Y. ^{[1
]}

Han G. ^{[1
]}

Lou D. ^{[1
]}

Pu X. ^{[1
]}

Liu G. ^{[1
]}

Jiang W. ^{[1
]}

Dong X. ^{[1
]}

Zou L. ^{[1
]}

机构：

[1] PetroChina Dagang Oilfield Company, Tianjin

来源：

Shiyou Xuebao/Acta Petrolei Sinica | 2021年 / 42卷 / 12期

关键词：

Coal-bearing source rock; Condensate gas reservoir; Huanghua depression; Main controlling factors; Paleozoic;

D O I：

10.7623/syxb202112005

中图分类号：

学科分类号：

摘要：

In recent years, high-yield coal-formed condensate gas flow has been found in Permian clastic rocks and Ordovician carbonate rocks in Wumaying buried hill and carbonate rocks in Qibei buried hill, proving that Paleozoic buried hills have good potential for oil and gas exploration in Huanghua depression. This paper systematically analyzes the geological characteristics, fluid properties and main controlling factors of Paleozoic condensate gas reservoir in Huanghua depression, dissects the reservoir-cap assemblage of typical Paleozoic condensate gas reservoir, hydrocarbon generation stages of coal-bearing source rocks, oil and gas charging stages and the genesis of condensate gas reservoir, and determines the development mode of Paleozoic coal-formed condensate gas reservoir. Research suggests that multiple high-quality reservoir-cap assemblages are developed in Paleozoic of Huanghua depression, providing superior accumulation and preservation conditions for the formation of condensate gas reservoirs. Carboniferous-Permian coal-bearing source rocks generated hydrocarbons in Early Cretaceous and Late Cenozoic, with the hydrocarbon generation characteristics of "oil in early stage and gas in late stage, dominated by late stage", which is the key for the formation of condensate gas reservoirs. Oil and gas reservoirs are formed by two-stage charging, mainly filled by crude oil in the early stage and natural gas in the late stage, and the late-stage charging plays a dominant role. Condensate gas reservoirs are formed through gas cut transformation by late-stage natural gas on early-stage paleo oil reservoirs; the accumulation evolution model has been established, with the characteristics of "hydrocarbon generation in two stages, oil in early stage and gas in late stage, accumulation by gas cut". The period of structural stability matches with the peak of hydrocarbon generation, which is conducive to the large-scale preservation of condensate gas reservoirs. In conclusion, the exploration discovery and theoretical understanding of Paleozoic coal-formed condensate gas reservoir in Huanghua depression are of great guidance and reference significance for oil and gas exploration in other Carboniferous-Permian stratigraphic regions of Bohai Bay Basin. © 2021, Editorial Office of ACTA PETROLEI SINICA. All right reserved.

引用

页码：1592 / 1604

页数：12

共 36 条

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