地学前缘 ›› 2012, Vol. 19 ›› Issue (1): 253-263.

• 论文 • 上一篇    下一篇

鄂尔多斯盆地海相烃源岩的成藏有效性分析

王传刚   

  1. 中国石油化工股份有限公司 石油勘探开发研究院， 北京 100083
  • 收稿日期:2011-02-10 修回日期:2011-03-01 出版日期:2012-01-10 发布日期:2012-01-10
  • 作者简介:王传刚（1970—），男，博士，高级工程师，主要从事油气勘探地质、资源与油藏地球化学研究。E-mail：wangcg@pepriscom
  • 基金资助:

    国家重大专项（2008ZX05002）；中国石油化工股份有限公司科技研发项目（P09014）

Availability analysis of oil pool forming for  marine source rock in Ordos Basin.

  1. Exploration and Production Research Institute, Sinopec， Beijing 100083, China
  • Received:2011-02-10 Revised:2011-03-01 Online:2012-01-10 Published:2012-01-10

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摘要：

明确海相烃源岩的勘探前景对于鄂尔多斯盆地下古生界勘探非常重要。鄂尔多斯盆地中东部广布的下奥陶统马家沟组碳酸盐岩动荡、富氧的古地理环境决定了其有机质丰度低、有机质类型差、生烃潜力低的先天性，不能成为有效烃源岩。盆地西、南缘广大地区呈“L”型连片分布的深水斜坡相中奥陶统平凉组泥页岩和泥灰岩有效烃源岩厚度80～200 m，有机质类型好（以Ⅰ型为主），有机质丰度高（>02%），存在大面积中等以上烃源岩，并基本处于高、过成熟阶段，有过较高程度的生排烃过程。生烃热模拟实验表明平凉组烃源岩在演化程度达到Ro值21%时，产烃率（TOC产烃）可高达22433 kg/t，原始生烃潜力巨大，地质历史上已累计生成资源量约432亿 t 油气当量，勘探前景广阔。

关键词: 鄂尔多斯盆地, 海相烃源岩, 碳酸盐岩, 平凉组, 勘探前景

Abstract:

The recognition of marine source rock validity is important to Lower Palaeozoic exploration in Ordos Basin. Carbonatite of lower Ordovician series is not the real source rock because of its congenital quality including low TOC, poor kerogen type, and little hydrocarbon generation potency. On the contrary, the platform slope facies that formed middle Ordovician Pingliang series is a set of fine marine source rock. Pingliang series source rock includes 80 to 200 meters mud shale and marlstone, which distributed in a large area around western and southern margin of Ordos Basin. With typeⅠkerogen and high organic content（>0.2%）, Pingliang source rock mainly belongs to above average rank, which attained high to post mature level and must have had a relatively high extent of hydrocarbon generation and expulsion history. Pyrolysis simulating experiment suggested that there have been 0.432 billion tons of hydrocarbon resource produced by Pingliang source rock in history. A perfect prospect should be expected.

Key words:  Ordos Basin, marine source rock, carbonatite, Pingliang series, exploration prospect

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