特种油气藏 ›› 2024, Vol. 31 ›› Issue (2): 93-102.DOI: 10.3969/j.issn.1006-6535.2024.02.011

• 地质勘探 • 上一篇    下一篇

塔里木盆地牙哈地区巴什基奇克组水下分流河道迁移叠置演化规律及地质意义

杨华童1, 林小兵1,2, 张萱1, 王壮生1, 范峻铭1, 王贵华1, 柳远松1   

  1. 1.成都理工大学,四川 成都 610059;
    2.自然资源部深时地理环境重建与应用重点实验室,四川 成都 610059
  • 收稿日期:2022-12-05 修回日期:2024-01-12 出版日期:2024-04-25 发布日期:2024-07-26
  • 通讯作者: 林小兵(1980—),男,讲师,2001年毕业于西南石油学院石油与天然气地质勘查专业,2007年毕业于成都理工大学沉积学专业,获博士学位,现主要从事储层地质学研究工作。
  • 作者简介:杨华童(1997—),女,2019年毕业于南阳师范学院地理信息科学专业,现为成都理工大学地质学专业在读硕士研究生,主要从事沉积地质学研究工作。
  • 基金资助:
    国家自然科学基金“致密砂岩含F成岩流体地球化学演化与硅质碎屑颗粒溶蚀机制”(42172135)

Evolutionary Law and Geological Significance of Migration and Superposition of Underwater Distributary Channels in the Bashijiqike Formation, Yaha Area, Tarim Basin

Yang Huatong1, Lin Xiaobing1,2, Zhang Xuan1, Wang Zhuangsheng1, Fan Junming1, Wang Guihua1, Liu Yuansong1   

  1. 1. Chengdu University of Technology, Chengdu, Sichuan 610059, China;
    2. Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources, Chengdu, Sichuan 610059, China
  • Received:2022-12-05 Revised:2024-01-12 Online:2024-04-25 Published:2024-07-26

摘要: 为了明确塔里木盆地牙哈地区干旱气候条件下季节性辫状河三角洲前缘水下分流河道的迁移特征,以巴什基奇克组为例,基于岩心观察、薄片鉴定、粒度分析、测井曲线分析,结合沉积背景,讨论了水下分流河道接触关系及迁移演化特征。结果表明:研究区巴什基奇克组为辫状河三角洲前缘亚相,发育水下分流河道、河口坝和分流间湾等微相;水下分流河道宽度为200~1 500 m,沉积物砂地比高,河道迁移频繁,迁移叠置样式为间湾相隔型、拼接型和切割型;水下分流河道砂体物性整体较好,迁移叠置后可形成孔渗性能较好的连续优质储层。明确水下分流河道迁移叠置规律对于牙哈地区油气勘探的深入具有重要指导意义。

关键词: 河道接触关系, 河道迁移叠置特征, 巴什基奇克组, 牙哈地区, 塔里木盆地

Abstract: In order to clarify the migration characteristics of the underwater distributary channel at the front of the seasonal braided river delta under the arid climatic conditions in the Yaha Area Tarim Basin, the contact relationship and migration evolutionary characteristics of the underwater distributary channel were discussed on the basis of the core observation, thin-section identification, grain-size analysis, and logging curve analysis in conjunction with the sedimentary background by taking the Bashijiqike Formation as an example. The results show that the Bashijiqike Formation in the study area is a front subfacies of the braided river delta, where the microfacies such as underwater distributary channel, mouth bar and interdistributary bay are developed; the width of the underwater distributary channel ranges from 200 to 1 500 m, the sand-to-ground ratio of the sediments is high, and the channel is migrated frequently, and the migration and superposition styles are of interdistributary bay separated, spliced and cut type; the physical properties of the sand body of the underwater distributary channel are better in general, and the sand body can be formed into continuous favorable reservoirs with good pore permeability after migration and superposition. It is of great significance to clarify the migration and superposition law of the underwater distributary channel for further oil and gas exploration in the Yaha Area.

Key words: channel contact relationship, channel migration and superposition characteristics, Bashijiqike Formation, Yaha Area, Tarim Basin

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