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天然气地球科学

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塔里木盆地震旦纪末地层—地貌格架与寒武纪初期烃源岩发育模式

杨鑫1,2，李慧莉1，岳勇3，刘士林1，李建交1，熊平1   

  1. 1.中国石化石油勘探开发研究院,北京 100083；
    2.中国科学院油气资源研究重点实验室，甘肃 兰州 730000；
    3.中国石化西北油田分公司勘探开发研究院,新疆 乌鲁木齐 830011
  • 收稿日期:2016-11-01 修回日期:2016-12-16 出版日期:2017-02-10 发布日期:2017-02-10
  • 作者简介:杨鑫（1985-），男，湖北黄冈人，高级工程师，博士后，主要从事含油气盆地构造分析. E-mail：xyang85@126.com.
  • 基金资助:

    国家科技重大专项(编号：2011ZX05005-002-04-01)资助.

The strata and palaeo-geomorphology framework at the end of Neoproterozoic and development mode of source rocks at the beginning of Cambrian

Yang Xin1,2，Li Hui-li1，Yue Yong3，Liu Shi-lin1，Li Jian-jiao1，Xiong Ping1   

  1. 1.Sinopec Petroleum Exploration and Development Research Institute,Beijing 100083,China;2.Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China;3.Exploration and Development Research Institute of Northwest Branch,Sinopec,Urumqi 830011,China
  • Received:2016-11-01 Revised:2016-12-16 Online:2017-02-10 Published:2017-02-10

PDF (PC)

466

摘要：

通过补充重点钻井前寒武系火山碎屑岩样品的锆石U_Pb定年，开展震旦纪_寒武纪初期地层对比研究，在震旦纪末古地貌格架基础上建立寒武纪初期烃源岩发育模式，并根据地震相特征推测烃源岩分布。锆石年代学结果显示T1井底火山碎屑岩样品的最年轻谐和年龄为707±8Ma，地层时代宜归南华系。寒武系底界（T09面）上下地层格架显示，震旦纪末期古地貌具有以巴楚、塔中一带为隆起高地，南高北低、西高东低的特征。在古台地和斜坡部位，寒武系底部烃源岩的分布与上震旦统白云岩有较好的一致性，在古隆起及其边缘表现为沉积缺失或相变。从T09界面以下地震相特征推测，西山布拉克组∈1xs烃源岩主要分布在满加尔坳陷，而玉尔吐斯组∈1y烃源岩在柯坪_塔北隆起、阿瓦提坳陷东部和顺托果勒地区都有分布。巴楚_塔中地区存在多个前南华系基底古隆起，广泛缺失寒武纪初期地层，整体烃源岩发育条件欠佳。麦盖提斜坡南华系_震旦系厚度大、分布广，可能有寒武系底部烃源岩分布.

关键词: 塔里木盆地, 震旦系, 古地貌, 烃源岩, 地震相

Abstract:

 Referred to the new recognition from petroleum exploration of the Sinian to Cambrian in South China,it could be considered that the distribution of the early Cambrian source rocks was controlled by the palaeo-geomorphology at the end of Neoproterozoic in the Tarim Basin.Based on the zircon U-Pb dating of pyroclastic rock samples from the clastic rock stratum under the bottom of Cambrian carbonate rocks,the stratigraphic correlation of the Sinian to Cambrian was conducted to build the palaeo-geomorphology framework at the end of Neoproterozoic in Tarim Basin.Lastly,according to the development mode of source rocks at the beginning of Cambrian,the distribution of source rocks was predicted initially through the division of seismic facies.The youngest zircon concordia age of pyroclastic rocks from the bottom of Well Tong 1 is 707±8Ma.It was revealed by the strata framework of the Sinian to Cambrian,the palaeo-geomorphology at the end of Neoproterozoic in Tarim Basin was characterized by an uplift highland in Bachu-Tazhong area,the south north high-low,and the west is higher than the east.The distribution of source rocks in the bottom of the Cambrian on the palaeo-platform and slopes was coincident with the Upper Sinian dolomite basically.But the contemporaneous sediment happened to be absent or changed in sedimentary facies on the uplift and its edges.From the seismic facies of the strata under the bottom of Cambrian,it could be concluded that source rocks in the type of the Xishanbraque Group (∈1xs) was limited in the Manjiaer Depression,while the source rocks in the type of the Yuertusi Group (∈1y) are widely distributed in south of Tabei Uplift,east Awat Depression,and even the Maigt Slope.However,among the west Awat Depression and western Tanguzibasi Depression,and the middle area of the Bachu-Tazhong Uplift,the contemporaneous source rocks may have changed into sedimentary facies of tidal flat and lagoon,instead of deep shelf.

Key words: Tarim Basin, Sinian, Palaeo-geomorphology, Resource rocks, Seismic facies

中图分类号: 

  • TE121

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