石油与天然气地质 ›› 2004, Vol. 25 ›› Issue (2): 139-143.doi: 10.11743/ogg20040204

• 专家论谈 • 上一篇    下一篇

西藏羌塘盆地古油藏发现及其意义

王成善1, 伊海生1,2, 刘池洋3, 李亚林2, 邹艳荣4, 伍新和2, 邓斌2, 杨兴科3   

  1. 1. 成都理工大学"油气藏地质及开发工程"国家重点实验室,四川成都 610059;
    2. 成都理工大学沉积地质研究所,四川成都 610059;
    3. 西北大学地质系,陕西西安 710069;
    4. 中国科学院广州地球化学研究所,广东广州 510640
  • 收稿日期:2004-04-07 出版日期:2004-04-25 发布日期:2012-01-16
  • 第一作者简介:王成善,男,53岁,教授(博士生导师),沉积盆地分析及石油地质
  • 基金项目:

    国家重点基础研究计划青藏项目[羌塘盆地演化与油气远景](G1998040804)

Discovery of paleo-oil-reservoir in Qiangtang basin in Tibet and its geological significance

Wang Chengshan1, Yi Haisheng1,2, Liu Chiyang3, Li Yalin2, Zou Yanrong4, Wu Xinhe2, Deng Bin2, Yang Xingke3   

  1. 1. Key Laboratory of Reservoir Geology & Development Engineering, Chengdu University of Technology, Chengdu, Sichuan;
    2. Research Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu, Sichuan;
    3. Geology Department of Northwest University, Xi'an, Shaanxi;
    4. Guangzhou Geochemistry Research Institute of China Academy of Sciences, Guangzhou, Guangdong
  • Received:2004-04-07 Online:2004-04-25 Published:2012-01-16

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摘要：

古油藏带位于羌塘盆地中央隆起带南部羌南坳陷比隆错-昂达尔错地区,东西长100km,南北宽20km,为一狭长湿状油苗群,露头上岩石的颜色呈暗褐色、褐灰色,为中侏罗统布曲组的白云岩。沉积环境以生物礁组合为主。经对比,古油藏油气主要来源于下侏罗统烃源岩。生烃过程模拟反映羌塘盆地有两次生排烃过程,第一次发生在140～150Ma,第二次发生在20Ma至现今。古油藏带的发现进一步说明了羌塘盆地具有良好的油气远景。

关键词: 西藏, 羌塘盆地, 古油藏带, 油气远景, 有机地球化学

Abstract:

Palaeo oil reservoirs are distributed in a narrow belt, 100 km long in E W direction and 20 km wide in S N direction, in Bilongco Angdarco area of Qiangnan depression in the southern part of the central uplift zone of Qiangtang basin.They are exactly a group of oil seepages.The outcropped rocks are the Middle Jurassic Buqu Fm.,dark brown and brownish gray dolomite.They are deposited mainly as biohermal complex.Correlation shows that hydrocarbons in the palaeo oil reservoirs have been sourced mainly from Lower Jurassic.Modelling of hydrocarbon generation process indicates that there have been two hydrocarbon generation and expulsion processes,one in 140-150 Ma and another since 20 Ma. The discovery of the palaeo oil reservoir belt further verifies that Qiangtang basin has good petroleum prospect.

Key words: Tibet, Qiangtang basin, palaeo oil reservoir, petroleum prospects, organic geochemistry

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