黔西地区打屋坝组富有机质页岩地球化学特征及其意义

陈榕; 苑坤; 张子亚; 徐秋枫; 卢树藩; 贺敬博

doi:10.11781/sysydz201901010

黔西地区打屋坝组富有机质页岩地球化学特征及其意义

doi: 10.11781/sysydz201901010

1. 中国地质调查局油气资源调查中心, 北京 100083;
2. 贵州省地质调查院, 贵阳 550000;
3. 自然资源部, 北京 100034

基金项目:

“十三五”国家科技重大专项“页岩气资源潜力评价方法与勘查技术攻关”（2016ZX05034）和中国地质调查局项目（DD20160196，DD20160178）联合资助。

详细信息

作者简介:
陈榕(1987-),女,博士,工程师,从事页岩气勘查及沉积学领域的研究。E-mail:chenrong@mail.cgs.gov.cn。

中图分类号: TE122.113
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出版历程
- 收稿日期: 2018-09-19
- 修回日期: 2018-11-30
- 刊出日期: 2019-01-28

Geochemical characteristics of organic-rich shale in the Dawuba Formation, western Guizhou Province

1. Oil and Gas Survey, China Geological Survey, Beijing 100083, China;
2. Guizhou Geological Survey, Guiyang 550000, China;
3. Natural Resources Ministry, Beijing 100034, China

摘要

摘要: 随着中国页岩气勘查开发的推进，南方地区上古生界富有机质页岩受到更多的关注。贵州西部地区下石炭统打屋坝组富有机质泥页岩段厚度大、分布范围广，是贵州页岩气勘查重点层位。在页岩气勘查过程中，潜质页岩的有机质丰度、成熟度以及干酪根类型等是评价一个地区页岩气潜力的主要参数。通过对黔西地区打屋坝组富有机质页岩露头样品进行有机碳含量、干酪根类型以及镜质体反射率测试，并结合前人数据，对该页岩有机地化特征进行了描述。黔西地区打屋坝组富有机质页岩有机碳含量普遍大于1.0%，多数分布在1.0%~3.0%范围内；干酪根类型以Ⅱ₂型、Ⅲ型为主，少数地区为Ⅱ₁型；大部分样品成熟度R_o在1.3%~3.0%之间，处于高成熟阶段和过成熟早期阶段。黔西六盘水水城地区和普安-晴隆地区打屋坝组页岩有机地化条件较好，具有较好的页岩气勘查潜力。
- 有机地球化学 /
- 富有机质页岩 /
- 打屋坝组 /
- 下石炭统 /
- 贵州西部
Abstract: Consideration of the organic-rich shale of the Upper Paleozoic in the southern part of China has been stimulated by the advancement of shale gas exploration and development in China. The organic shale section of the Lower Carboniferous Dawuba Formation in the western part of Guizhou Province, which is widely distributed and thick, is one of the main targets of Guizhou shale gas exploration. In the process of shale gas exploration, the organic matter abundance, maturity and kerogen type of organic-rich shale are the main parameters of shale gas evaluation. In this paper, these three properties were determined on organic shale outcrop samples of the Dawuba Formation and combined with previous data, the organic geochemical characteristics of the Dawuba Formation have been described. The TOC content of organic-rich shale in the Dawuba Formation in the western Guizhou is generally > 1%, and most samples are in the range of 1%-3%. The kerogen in the Dawuba Formation is mainly of type Ⅱ₂ and type Ⅲ, and in some parts type Ⅱ₁ is present. R_o is generally > 0.6%, mostly distributed in the range of 1.3%-3.0%, which means they are high maturity to over-mature. The regional data show that the organic geochemical properties and the shale gas exploration potential of the Dawuba Formation are better in Liupanshui Shuicheng and Pu'an-Qinglong areas.
- organic geochemistry /
- organic-rich shale /
- Dawuba Formation /
- Lower Carboniferous /
- western Guizhou Province

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