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天然气地球科学 ›› 2011, Vol. 22 ›› Issue (4): 618–627.doi: 10.11764/j.issn.1672-1926.2011.04.618

• 天然气地质学 • 上一篇    下一篇

四川盆地上三叠统须家河组重矿物特征及物源区意义

施振生, 王秀芹, 吴长江   

  1. 1.中国矿业大学(北京)地球科学与测绘工程学院，北京  100083；
    2.中国石油勘探开发研究院廊坊分院天然气地质所，河北 廊坊  065007；
    3.中国石油西南油气田分公司勘探开发研究院，四川 成都 610051
  • 收稿日期:2011-05-05 修回日期:2011-06-03 出版日期:2011-08-10 发布日期:2011-08-10
  • 通讯作者: 施振生shizs69@petrochina.com.cn E-mail:shizs69@petrochina.com.cn
  • 作者简介:施振生(1976-)，男，安徽安庆人，高级工程师，博士,主要从事沉积学与层序地层学研究.
  • 基金资助:

    国家重点基础研究发展规划(“973”)项目(编号：2007CB209504) 资助.

The Heavy Minerals and Provenances of the Upper Triassic Xujiahe Formation in Sichuan Basin

SHI Zhen-Sheng, WANG Xiu-Qin, WU Chang-Jiang   

  1. 1.China University of Mining and Technology,Beijing 100083,China；
    2.Langfang Branch of PetroChina Research Institute of Petroleum Exploration and Development,Langfang 065007,China；
    3.PetroChina Southwest Oil and Gas Field Company,Chengdu 610051,China
  • Received:2011-05-05 Revised:2011-06-03 Online:2011-08-10 Published:2011-08-10

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摘要：

四川盆地上三叠统须家河组以超稳定型重矿物为主，不同层段重矿物组成差异不大。重矿物分析不仅有利于沉积体系及古水系的准确恢复和对远景区油气储层的准确预测，而且还可揭示龙门山等物源区的岩石—大地构造属性及其隆升历史。Q型聚类分析和主因子分析表明，须家河组母岩以沉积岩和低级变质岩为主，高级变质岩含量相对较低。由下至上，母岩中高级变质岩含量逐渐增加。ZTR指数分析表明，晚三叠世四川盆地主要发育4个物源，分别位于川西南部、川西北部、川东北部和盆地东南，物源分布位置具有继承性。结合造山带和前人沉积学研究成果认为，晚三叠世，龙门山褶皱带开始逐渐形成。须二期，龙门山北段已露出水面遭受剥蚀，但龙门山南段仍是水下隆起或尚未隆升。须四期，龙门山北段继续隆升遭受剥蚀，龙门山南段开始抬升遭受剥蚀，并向盆地提供物源。须六期，龙门山地区全面抬升遭受剥蚀，并向盆地提供物源。

关键词: 四川盆地, 上三叠统, 重矿物, 物源分析, 构造演化

Abstract:

Hyperstable heavy minerals with little diversity in different members were dominated in the upper Triassic Xujiahe Formation of Sichuan basin.Heavy mineral measurement is not only helpful to accurate restoration of depositional systems and ancient water systems,but also reveal the rock\|tectonic attribute of Longmen Shan and recovery of tectonic uplift history.Q\|cluster and principal factor show that the parent rock in the Xujiahe Formation is dominated by sedimentary rocks and low\|level metamorphic rocks,as well as low content of high-grade metamorphic rocks.The content of high-grade metamorphic rocks increases from section bottom to top.ZTR index shows that 4 main source areas in the late Triassic Sichuan basin are located in south-west,north\|west,north-east and south\|east of Sichuan basin,respectively.The distribution of source areas exist inherited.Based on tectonic belt and sedimentology of previous research,the Longmen Shan fold belt begin to form at late Triassic Period.At the second phase of Xujiahe Formation,the northern section of Longmen Shan had been exposed and eroded,but the southern section was still underwater or not yet uplifted.At the fourth phase,the northern section of Longmen Shan continued uplift and suffered erosion,whereas the southern section started uplift and erosion and provided the sediments toward the basin.At the sixth phase,the Longmen Shan was uplifted fully and provided sediments to the basin.

Key words: Sichuan basin, Upper Triassic, Heavy mineral, Provenance, Tectonic evolution.

中图分类号: 

  • TE122.1+1


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