石油与天然气地质 ›› 2015, Vol. 36 ›› Issue (4): 534-544.doi: 10.11743/ogg20150402

• 油气地质 • 上一篇    下一篇

库车坳陷侏罗系-新近系砾岩特征变化及其对天山隆升的响应

高志勇1,2, 朱如凯1,2, 冯佳睿1,2, 李小陪3, 赵雪松3, 郭美丽3   

  1. 1. 中国石油 勘探开发研究院 实验研究中心, 北京 100083;
    2. 中国石油 勘探开发研究院 提高石油采收率国家重点实验室, 北京 100083;
    3. 中国地质大学, 北京 100083
  • 收稿日期:2015-03-27 修回日期:2015-06-30 出版日期:2015-08-08 发布日期:2015-08-28
  • 第一作者简介:高志勇(1974—),男,高级工程师,沉积学、储层地质学。E-mail:gzybox@163.com。
  • 基金项目:

    国家科技重大专项(2011ZX05003-002);中国石油股份公司科技项目(2014B-0408)。

Jurassic-Neogene conglomerate characteristics in Kuqa Depression and their response to tectonic uplifting of Tianshan Mountains

Gao Zhiyong1,2, Zhu Rukai1,2, Feng Jiarui1,2, Li Xiaopei3, Zhao Xuesong3, Guo Meili3   

  1. 1. Petroleum Geology Research and Laboratory Center of Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;
    2. State Key Laboratory of Enhanced Oil Recovery of Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China;
    3. China University of Geosciences, Beijing 100083, China
  • Received:2015-03-27 Revised:2015-06-30 Online:2015-08-08 Published:2015-08-28

摘要:

通过对库车坳陷北部野外露头侏罗系-新近系多套砾岩中砾石成分、砾石扁度、球度、砾径及沉积相类型等的分析,半定量评价了南天山山前砾石的沉积搬运距离。研究认为,侏罗系-新近系砾石搬运距离表现为由远及近的规律。剖面点处下侏罗统阿合组-阳霞组砾石搬运距离最远,计算出其搬运距离可达110~130 km;上侏罗统喀拉扎组砾石的搬运距离约为40 km;下白垩统亚格列木组-巴什基奇克组砾石搬运距离较近,约为20~45 km。古近系砾石沉积搬运距离约为20~50 km,新近系吉迪克组砾石的搬运距离最短,在20 km左右。结合前人磷灰石裂变径迹测年数据及研究成果,认为中、新生代天山存在晚三叠世—早侏罗世、晚侏罗世—早白垩世、晚白垩世—始新世及中新世以来4个隆升阶段,隆升范围两小两大。由砾石成分、砾态特征、砾径及砾石搬运距离反映的沉积物源区迁移等变化规律表明,砾岩沉积演化对天山4个阶段隆升的构造运动强烈程度具明显的响应。

关键词: 天山隆升, 搬运距离, 砾态, 砾岩, 库车坳陷

Abstract:

Samples from multiple sets of the Jurassic-Neogene conglomerate outcrops in Kuqa depression were collected and analyzed for the composition, flatness, sphericity, and size of gravel, and the sedimentary facies that had made everything happened, and for a semi-quantitative study of transportation distance of gravel in front of southern Tianshan Mountain.The results show a far-to-near pattern of gravel transport distance for the Jurassic-Neogene conglomerate.Gravels in the Lower Jurassic Ahe-Yangxia Formations migrated the farthest to 110-130 km, and those from the Neogene Jidike Formation moved the shortest at only 20 km.Between them, the gravels of the Upper Jurassic Kelaza Formation moved about 40 km, that of the Lower Cretaceous Yageliebu-Bashijiqike Formations ran at a distance range between 20 and 45 km and that in the Palaeogene conglomerate transported from 20 to 50 km.Combined with the previous apatite fission track data, the new results indicate that the uplift of the Tianshan Mountains can be divided into 4 stages(two of them were major unplifting and two of them were minor ones):the Triassic-Early Jurassic, Late Jurassic-Early Cretaceous, Late Cretaceous-Eocene, and Miocene-present.The composition, shape and size of the gravels as well as migration of provenance reflected by the gravel transport distance show that the sedimentary evolution of the conglomerate responded strongly to the 4 stages of uplifting process.

Key words: uplift of Tianshan Mountains, transportation distance, gravel geometry, conglomerate, Kuqa depression

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