库车坳陷三叠系黄山街组沉积特征及地质意义
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中国地质调查局成都地质调查中心(西南地质科技创新中心)

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Sedimentary Characteristics and Geological Significance of Huangshanjie Formation of Triassic in Kuqa Depression
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Chengdu Center,China Geological Survey (Geosiciences Innovation Center of Southwest China)

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    摘要:

    塔里木盆地库车坳陷三叠系黄山街组为一套源、储、盖共生的地层,是未来潜在的油气勘探目标。但目前缺乏其详细沉积特征与演化方面的研究,不利于对古地理演化的理解。故基于多条露头剖面,详细分析沉积特征并揭示其地质意义,结果表明:(1)黄山街组一段与二段构成向上变深的下旋回,三段构成向上变深但不完整的中旋回,四段构成浅→深→浅的上旋回;(2)由砾质粗碎屑构成的黄山街组一段与三段是物源区在印支运动中两幕强烈隆升的沉积响应;(3)黄山街组中发育有洪水、地震等所致的事件沉积;(4)黄四段发育的暗色泥岩是高可容纳空间下充足物源的快速沉积;(5)黄三段沉积之后发生了区域性的构造抬升及构造-沉积转换,源区也呈准平原化;(6)黄四段与下伏黄三段及上覆塔里奇克组之间均存在一定的沉积间断。

    Abstract:

    The Huangshanjie Formation in the Kuqa depression of the Tarim basin is a set of strata with source, reservoir and cap coexistence, which is a potential target of oil and gas exploration in the future. However, at present there is a lack of detailed research on its sedimentary characteristics, which is not conducive to understanding the evolution of paleogeography. Therefore, based on the multiple outcrop sections, the sedimentary characteristics and the revealed geological significance were studied. The results show that: (1)In Huangshanjie Formation, the deep-up lower cycle is formed with the first and second members, the incomplete deep-up middle cycle is formed with the third member, and the upper cycle changing from shallow → deep → shallow is formed with the fourth member.; (2) The first and third members of the Huangshanjie Formation, formed with pebbly coarse clasts, are the sedimentary responses to two episodes of intense uplift in the provenance area during the Indosinian movement; (3) Event deposits caused by floods, earthquakes, etc. are developed in the Huangshanjie Formation; (4) In the 4th member, the dark mudstone is the rapid deposition of sufficient provenance under high accommodation;(5) After the deposition of the third member of the Huangshanjie Formation, regional tectonic uplift and tectonic-sedimentary transformation occurred, and the provenance also became quasi-plain; (6) There is a certain hiatus between the 4th Member and the underlying 3rd Member of Huangshanjie Formation and the overlying Taliqik Formation.

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  • 收稿日期:2023-12-26
  • 最后修改日期:2024-06-07
  • 录用日期:2024-06-27
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