Special Oil & Gas Reservoirs >

2022 , Vol. 29 >Issue 5: 18 - 27

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.05.003

Geologic Exploration

Accumulation Mechanism and Enrichment Law of Tight Gas in Shengbei Structural Zone

  • Liu Juntian ,
  • Xie Dianhe ,
  • Peng Yazhong ,
  • Jin Jikun ,
  • Sun Yufeng ,
  • Li Xingliang
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  • PetroChina Tuha Oilfield Company, Hami, Xinjiang 839009,China

Received date: 2022-01-17

  Revised date: 2022-07-25

  Online published: 2023-01-10

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Abstract

The Shengbei structural zone has great potential for tight oil and gas resources, with many oil and gas-bearing formations, and industrial oil and gas have been obtained in several formations including the Middle Jurassic and Cretaceous, and the discovered oil and gas reservoirs are dense. In view of the low degree of research on the oil and gas filling mechanism in the process of oil and gas accumulation, the microscopic testing technology of reservoir fluid inclusions was adopted, combined with the simulation results of formation burial history, thermal evolution history and hydrocarbon source rock maturity history, to analyze the oil and gas filling time and accumulation period, and to study the accumulation mechanism and enrichment law. The results show that the Shengbei structural zone mainly has two oil and gas accumulation periods, namely Late Jurassic-Early Cretaceous and Neogene-Quaternary; the hydrocarbon source rocks of the Shuixigou Group have two times of hydrocarbon generation and expulsion, in the Late Jurassic-Early Cretaceous and Neogene, respectively. The hydrocarbon generation and expulsion period of lacustrine mudstone in Qiketai Formation was dominated by Neogene; the hydrocarbon accumulation was controlled by oil source faults, sand body connectivity and fault sealing. The hydrocarbon source rocks are developed in the northeastern part of the Shengbei Sag, the formation is overpressured, the deep and large faults are developed, and the sandstone reservoirs are superimposed and distributed in different strata, so this area is favorable for oil and gas exploration. The research results have guiding significance for the Middle Jurassic tight gas exploration in the Shengbei Sag, Turpan-Hami Basin.

Key words： Shengbei Sag; Shengbei structural zone; tight gas; inclusions; accumulation mechanism; enrichment factors

Cite this article

Liu Juntian , Xie Dianhe , Peng Yazhong , Jin Jikun , Sun Yufeng , Li Xingliang . Accumulation Mechanism and Enrichment Law of Tight Gas in Shengbei Structural Zone[J]. Special Oil & Gas Reservoirs, 2022 , 29(5) : 18 -27 . DOI: 10.3969/j.issn.1006-6535.2022.05.003

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