岩性油气藏 ›› 2015, Vol. 27 ›› Issue (2): 31–37.doi: 10.3969/j.issn.1673-8926.2015.02.006

• 油气地质 • 上一篇    下一篇

中扬子地区陡山沱组页岩储层中黄铁矿特征及其油气意义

徐祖新1,韩淑敏2,王启超3   

  1.  1. 中国石油勘探开发研究院,北京 100083 ; 2. 中国石油集团东方地球物理勘探有限责任公司,河北 涿州 072750 ; 3. 中国石油大学(北京) 地球科学学院,北京 102249
  • 出版日期:2015-03-03 发布日期:2015-03-03
  • 第一作者:徐祖新( 1988- ),男,中国石油勘探开发研究院在读博士研究生,研究方向为非常规油气地质。 地址:( 100083 )北京市海淀区学院路 20号 910 信箱地质所 239 室。 E-mail : xuzuxin-20081234@163.com 。
  • 基金资助:

    中国石油重大科技专项“成熟探区油气分布规律与精细勘探技术研究”(编号: 2011D-07 )资助

Characteristics of pyrite and its hydrocarbon significance of shale reservoir of Doushantuo Formation in middle Yangtze area

X U Zuxin1, HAN Shumin2,WANG Qichao3   

  1.  1. PetroChina Research Institute of Petroleum Exploration & Development , Beijing 100083 , China ; 2. Bureau of Geophysics Prospecting Inc. , CNPC , Zhuozhou 072750 , Hebei , China ; 3. College of Geosciences , China University of Petrdeum , Beijing 102249 , China
  • Online:2015-03-03 Published:2015-03-03

摘要:

黄铁矿是富有机质沉积的特征矿物,是恢复沉积环境的重要指标,也可以指示页岩的含油气性。基于氩离子抛光-扫描电镜(Ar-SEM)技术获得陡山沱组页岩高分辨率扫描电镜图像,利用 ImageJ 软件统计和分析草莓状黄铁矿粒径大小,探讨黄铁矿含量和吸附气含量之间的关系。 结果表明:①陡山沱组页岩中草莓状黄铁矿粒径小,代表其经历了较长时间的静水缺氧沉积环境,对有机质的富集和保存均有利,为页岩气的形成提供了良好的沉积条件;②陡山沱组页岩储层中黄铁矿含量与吸附气含量呈正相关关系,根据黄铁矿的含量可以预测页岩吸附气;③铁含量越高越有利于有机质富集,而有机质含量的高低直接影响着页岩气的生成能力和赋存能力,根据平面上黄铁矿的富集程度可以预测页岩含气区。

关键词: 致密油, 渗透率, 大孔区间孔隙度, 长垣南地区, 松辽盆地

Abstract:

 Pyrite is a mineral with the deposition of abundant organic matter, and it is not only an important index to restore sedimentary environment, but also can indicate the characteristics of oil and gas in shale reservoirs. This paper used argon-ion polishing-scanning electron microscopy (Ar-SEM) techniques and ImageJ software to study grain size and hydrocarbon significance of shale reservoir of Doushantuo Formation in the Middle Yangtze area. The results show that:①the framboids pyrite in shale of Doushantuo Formation is of small particle size, showing a long anoxic sedimentary environment, which is better for the deposition and preservation of organic matter and provides good conditions for the formation of shale gas; ②the content of pyrite has positive correlation with the content of adsorbed gas in the shale of Doushantuo Formation, thus we can predicate adsorbed gas in shale according to the content of pyrite; ③iron is the necessary material for deposition of organic matter, high iron content is beneficial to the enrichment of organic matter, and the organic matter content influences the shale gas generation and storage capacity, so we can predicate maximum shale gas-bearing area according to the enrichment degree of pyrite.

Key words:  tight oil, permeability, big pore interval porosity, southern placanticline, Songliao Basin

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