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珠江口盆地恩平凹陷北部隆起区油气远源富集与主控因素

吴静

吴静. 珠江口盆地恩平凹陷北部隆起区油气远源富集与主控因素[J]. 地质科技通报, 2022, 41(4): 117-124. doi: 10.19509/j.cnki.dzkq.2022.0020
引用本文: 吴静. 珠江口盆地恩平凹陷北部隆起区油气远源富集与主控因素[J]. 地质科技通报, 2022, 41(4): 117-124. doi: 10.19509/j.cnki.dzkq.2022.0020
Wu Jing. Key factors of far-source hydrocarbon enrichment in the northern uplift area of Enping Sag in Pearl River Mouth Basin[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 117-124. doi: 10.19509/j.cnki.dzkq.2022.0020
Citation: Wu Jing. Key factors of far-source hydrocarbon enrichment in the northern uplift area of Enping Sag in Pearl River Mouth Basin[J]. Bulletin of Geological Science and Technology, 2022, 41(4): 117-124. doi: 10.19509/j.cnki.dzkq.2022.0020

珠江口盆地恩平凹陷北部隆起区油气远源富集与主控因素

doi: 10.19509/j.cnki.dzkq.2022.0020
基金项目: 

国家科技重大专项 2016ZX05024-004

中海油深圳分公司生产性科研项目 SCKY-2020-SZ-21

详细信息
    作者简介:

    吴静(1981-), 男, 工程师, 主要从事石油地质与勘探综合研究工作。E-mail: wujing5@cnooc.com.cn

  • 中图分类号: P618.13

Key factors of far-source hydrocarbon enrichment in the northern uplift area of Enping Sag in Pearl River Mouth Basin

  • 摘要:

    珠江口盆地恩平凹陷北部隆起区的油气勘探始于20世纪70年代, 历经20多年反复探索一直未获得商业发现。近年来, 恩平凹陷北部新近系油气勘探接连取得重大突破, 逐渐成为勘探的热点地区。勘探实践表明远源富集成藏是恩平凹陷北部隆起区新近系油气成藏的重要特征。首先, 侧向断开控洼边界且深入洼陷内部的长期活动断裂体系是恩平北带油气能够大规模向北运移的关键因素; 这类断裂早期控制陡坡带文昌组物源供给, 晚期继承性活动切穿文昌组仓储砂体及烃源岩, 使文昌组烃源岩生成的油气通过油源断裂垂向调节至中浅层新近系储层中; 其次, 油气经过侧向穿断面运移后, 能继续沿断层对盘的构造脊往高部位汇聚, 使油气能够向北远距离运移并富集成藏。油源断裂、仓储砂体与构造脊的耦合是恩平凹陷北部隆起区远源油气富集的关键因素, 同时暗示深层文昌组仓储砂体的巨大勘探潜力。恩平凹陷北部隆起区具备油气远源富集成藏的条件, 在目前已获突破的区域继续向北仍发育较多构造圈闭, 为新近系油气勘探的潜力区带。

     

  • 图 1  恩平凹陷北部隆起构造带油田群分布示意图(据文献[6]修改)

    Figure 1.  Distribution of oilfield groups in the northern uplift structural belt of Enping Sag

    图 2  恩平凹陷北部烃源岩-仓储砂体-断裂构造-构造脊剖面(剖面位置见图 3中的B-B′)

    Figure 2.  Section of source rock, storage body sand and fault structure structural ridge in the north of Enping Sag

    图 3  恩平凹陷断裂平面分布图

    Figure 3.  Plane distribution of faults in Enping Sag

    图 4  北部隆起区侧向断裂与仓储砂体展布图

    Figure 4.  Distribution of the fault and storage sand body in the northern uplift area

    图 5  北部隆起区物源剖面特征(剖面位置见图 4)

    Figure 5.  Characteristics of the provenance profile in the northern uplift area

    图 6  油气成藏关键时期10 Ma F3、F8弧形断裂活动特征

    Figure 6.  Activity characteristics of the F3 and F8 arc faults at 10 million years in the key period of oil and gas accumulation

    图 7  恩平北部隆起区烃类长距离运移立体图

    Figure 7.  Stereoscopic map of long-distance hydrocarbon migration in the northern uplift area of the Enping Sag

    图 8  恩平北部隆起区穿断运移模式图

    Figure 8.  Model map of migration across fault in the northern uplift area of the Enping Sag

    图 9  恩平北部隆起区远源富集模式图

    Figure 9.  Remote source enrichment model of the uplift area in the northern Enping Sag

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  • 收稿日期:  2021-03-12
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