新疆石油地质 ›› 2024, Vol. 45 ›› Issue (2): 127-138.doi: 10.7657/XJPG20240201

• 油气勘探 •    下一篇

准噶尔盆地东部残留海相凹陷勘探实践及全油气系统

支东明1(), 陈旋2, 杨润泽3, 刘俊田2(), 于海跃2, 马强2   

  1. 1.怀柔国家实验室新疆基地,乌鲁木齐 830011
    2.中国石油 吐哈油田分公司,新疆 哈密 839009
    3.中国石油 勘探开发研究院,北京 100083
  • 收稿日期:2023-12-25 修回日期:2024-01-03 出版日期:2024-04-01 发布日期:2024-03-26
  • 通讯作者: 刘俊田 E-mail:zhidm@petrochina.com.cn;ljtyjy@petrochina.com.cn
  • 作者简介:支东明(1971-),男,上海人,教授级高级工程师,石油地质,(Tel)0902-2765666(Email)zhidm@petrochina.com.cn
  • 基金资助:
    新疆维吾尔自治区“天山英才”科技创新领军人才支持项目(2022TSYCLJ0070);中国石油科技项目(2023YQX10109)

Exploration Practice and Total Petroleum System in Residual Marine Sag,Eastern Junggar Basin

ZHI Dongming1(), CHEN Xuan2, YANG Runze3, LIU Juntian2(), YU Haiyue2, MA Qiang2   

  1. 1. Xinjiang Base, Huairou Laboratory, Urumqi, Xinjiang 830011, China
    2. Tuha Oilfield Company, PetroChina, Hami, Xinjiang 839009, China
    3. Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
  • Received:2023-12-25 Revised:2024-01-03 Online:2024-04-01 Published:2024-03-26
  • Contact: LIU Juntian E-mail:zhidm@petrochina.com.cn;ljtyjy@petrochina.com.cn

摘要:

准噶尔盆地东部石钱滩凹陷为残留海相凹陷,近年来多口井在石钱滩组获高产天然气,且凹陷各部位不同层系均见到油气显示,揭示了其良好的油气勘探潜力及全油气系统特征。基于地震、钻井、测井、有机地球化学等资料,对石钱滩凹陷形成及演化、全油气系统形成条件及油气成藏模式进行了研究。晚石炭世的北天山洋壳俯冲及海水侵入,使得石钱滩地区发育陆源供给的海相中等—优质烃源岩,该烃源岩处于成熟—高成熟阶段;储集层类型齐全,发育石炭系火山岩、石钱滩组海相碎屑岩和二叠系金沟组陆相碎屑岩,在这几类储集层中均有油气成藏;受石钱滩组烃源岩生烃演化及多类型储集层特征的控制,形成了凹陷区页岩气藏—斜坡区致密油气藏—高部位常规油气藏的分布模式,具有非常规油气藏与常规油气藏有序共生的全油气系统特征。基于全油气系统理论,针对石钱滩凹陷,应在近源斜坡区寻找致密油气藏,在源上断阶带及构造高部位寻找构造-岩性油气藏及火山岩风化壳油气藏,在源内寻找海相页岩天然气藏;北疆石炭系近源有利岩性相带、山前冲断掩伏构造、盆内古隆起和斜坡区是有利的勘探区域,应围绕凹陷区页岩油气藏、环凹陷区致密砂岩油气藏、高部位常规油气藏和隆起区火山岩风化壳油气藏展开勘探。

关键词: 准噶尔盆地, 石钱滩凹陷, 石炭系, 残留海相, 石钱滩组, 油气勘探, 全油气系统

Abstract:

The Shiqiantan sag in the eastern Junggar basin is a residual marine sag. In recent years, high-yield natural gas have been obtained from many wells in the Shiqiantan formation, and oil and gas shows have been observed in different strata across the sag, indicating its excellent exploration potential and characteristics as a total petroleum system. Based on seismic, drilling, logging, and organic geochemical data, the formation and evolution of the Shiqiantan sag, the conditions for the formation of the total petroleum system, and the models of hydrocarbon accumulation are studied. The results show that during the Late Carboniferous the north Tianshan oceanic crust subduction and seawater intrusion in the region led to the development of terrigenous, marine, medium- to high-quality source rocks which are now in the mature- to high-mature stage. The reservoir contains volcanic rocks in the Carboniferous strata, marine clastic rocks in the Shiqiantan formation, and continental clastic rocks in the Permian Jingou formation, in all of which hydrocarbons were accumulated. Controlled by the hydrocarbon generation and evolution in the source rocks of the Shiqiantan formation and the characteristics of multiple types of reservoirs, a distribution pattern of shale gas reservoir in the sag-tight oil and gas reservoir in the slope-conventional oil and gas reservoir in the high position is formed, showing a total petroleum system featured with orderly symbiosis of unconventional and conventional oil and gas reservoirs. According to the theory of total petroleum system, the exploration in the Shiqiantan sag should focus on tight oil and gas reservoirs in the near-source slope area, structural-lithological oil and gas reservoirs and volcanic weathering-crust oil and gas reservoirs in the above-source fault-terrace area and structural high, and marine shale gas reservoirs within the source. The Carboniferous near-source favorable lithofacies belts, piedmont thrust fault-concealed structures, intra-basin palaeouplifts, and slope areas are favorable exploration zones in northern Xinjiang. Specifically, exploration efforts should be made towards shale oil and gas reservoirs within the sag, tight sandstone oil and gas reservoirs around the sag, conventional oil and gas reservoirs in the structural highs, and volcanic weathering-crust oil and gas reservoirs in uplifted areas.

Key words: Junggar basin, Shiqiantan sag, Carboniferous, residual marine, Shiqiantan formation, oil and gas exploration, total petroleum system

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