胜北构造带致密气成藏机理及富集规律

doi:10.3969/j.issn.1006-6535.2022.05.003

摘要/Abstract

摘要： 胜北构造带致密油气资源潜力大,含油气层系多,已在中侏罗统及白垩系等多个层系获得工业油气流,已发现的油气藏储层致密。针对油气成藏过程中油气充注机理研究程度低的问题,运用储层流体包裹体显微测试技术,结合地层埋藏史、热演化史和烃源岩成熟史模拟结果,分析油气充注时间和成藏期次,开展成藏机理及富集规律研究。结果表明,胜北构造带主要有2期油气成藏期,分别为晚侏罗世—早白垩世和新近纪—第四纪;水西沟群烃源岩有早晚2次生排烃,分别在晚侏罗世—早白垩世和新近纪,七克台组湖相泥岩生排烃期以新近纪为主;油气成藏受油源断裂、砂体连通性和断层封闭性控制。胜北洼陷东北区烃源岩发育,地层超压,深大断裂发育,不同层位砂岩储层叠置展布,是油气勘探有利区域。研究成果对吐哈盆地胜北洼陷中侏罗统致密气勘探具有指导意义。

关键词: 胜北洼陷, 胜北构造带, 致密气, 包裹体, 成藏机理, 富集因素

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

中图分类号:

TE122.2

刘俊田, 谢佃和, 彭亚中, 靳继坤, 孙玉峰, 李兴亮. 胜北构造带致密气成藏机理及富集规律[J]. 特种油气藏, 2022, 29(5): 18-27.

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.

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