岩性油气藏 ›› 2017, Vol. 29 ›› Issue (1): 21–26.doi: 10.3969/j.issn.1673-8926.2017.01.003

• 油气地质 • 上一篇    下一篇

上扬子西北缘宁强湾牛蹄塘组有机地球化学特征

程俊1, 徐晓飞1, 张文峰1, 米玛旺久2, 郭俊1   

  1. 1. 陕西区域地质矿产研究院, 陕西 咸阳 712000;
    2. 西藏地勘局 第二地质调查大队, 拉萨 850003
  • 收稿日期:2016-05-05 修回日期:2016-07-21 出版日期:2017-01-21 发布日期:2017-01-21
  • 作者简介:程俊(1988-),男,工程师,主要从事区域地质调查研究工作。地址:(712000)陕西省咸阳市滨河西路7号地质矿产研究院。Email:546881350@qq.com。
  • 基金资助:
    中国地质调查局成都地质调查中心子项目“四川盆地页岩气基础地质综合调查”（编号:12120115004401）资助

Organic geochemical characteristics of Niutitang Formation in Ningqiang Bay,the northwestern margin of Upper Yangtze platform

CHENG Jun1, XU Xiaofei1, ZHANG Wenfeng1, MI Mawangjiu2, GUO Jun1   

  1. 1. Shaanxi Research Institute of Geology and Mineral Resources, Xianyang 712000, Shaanxi, China;
    2. No. 2 Geological Survey Party, Tibet Bureau of Geology and Mineral Exploration and Development, Lhasa 850003, China
  • Received:2016-05-05 Revised:2016-07-21 Online:2017-01-21 Published:2017-01-21

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摘要： 上扬子西北缘宁强湾牛蹄塘组富有机质泥页岩极其发育，具备油气生成条件，但尚未对其开展页岩气调查与评价。通过野外露头测量和样品有机地球化学分析测试，查明了研究区牛蹄塘组泥页岩发育厚度、分布特征、沉积环境及有机地球化学特征。结果表明：富有机质泥页岩累计厚度最大可达108.5 m；TOC 质量分数为0.08%～7.54%，平均为1.97%；有机质类型为Ⅰ型；Tmax 为419～496 ℃，平均为448 ℃；Ro 平均为2.36%，烃源岩已进入成熟—过成熟演化阶段。研究区烃源岩受宁强湾古地理控制，西侧烃源岩生烃条件明显优于东侧，前者具有良好的页岩气勘探前景。

Abstract: The organic-rich shales of Niutitang Formation are well developed in Ningqiang Bay,the northwestern margin of Upper Yangtze platform,and they have good oil and gas generation conditions, nevertheless,no investigation and evaluation for shale gas has been carried out in this area. Based on field geological survey and sample test,the thickness,distribution characteristics,depositional settings and organic geochemical characteristics of shales of Niutitang Formation were investigated. The results show that the cumulative thickness of organicrich shales is up to 108.5 m;the mass fraction of total organic carbon is 0.08%-7.54% with an average value of 1.97%;kerogen is type Ⅰ;the Tmax ranges from 419 ℃ to 496 ℃ with an average value of 448 ℃;and the average Ro is 2.36%. These data show that the source rocks have entered into mature to high mature stage. The source rocks are influenced by complex palaeogeography in Ningqiang Bay,and the source rocks on the west side are better than that on the east side,with good prospects for shale gas exploration.

中图分类号: 

  • P593
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