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渝东南地区黔江凹陷五峰组—龙马溪组页岩储层特征及其对含气量的影响

毕赫,姜振学，李鹏，李卓，唐相路，张定宇，许野   

  1. 1.中国石油大学（北京）油气资源与探测国家重点实验室，中国石油大学（北京）非常规天然气研究院，北京 102249；2.中国石油勘探开发研究院，北京 100083；3.重庆市国土资源和房屋管理局，重庆 400000）
  • 收稿日期:2013-09-02 修回日期:2013-11-29 出版日期:2014-08-10 发布日期:2014-08-10
  • 作者简介: 毕赫（1989-），女，黑龙江大庆人，硕士研究生，主要从事非常规油气藏形成与分布、盆地分析与油气资源评价研究. E-mail：bihecup@163.com.
  • 基金资助:
    国家科技重大专项课题(编号：2011ZX05018-002)；重庆市国土资源和房屋管理局科技计划重大项目（编号：CQGT-KJ-2012）联合资助.
     

#br# Shale Reservoir Characteristics and Its Influence on Gas Contentof Wufeng-Longmaxi Formation in the Southeastern Chongqing

BI He，JIANG Zhen-xue，LI Peng，LI Zhuo，TANG Xiang-lu，ZHANG Ding-yu，XU Ye   

  1. 1.State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum UnconventionalNational Gas Institute,China University of Petroleum,Beijing 102249,China;2.Research Institute of Petroleum
    Exploration and Development,Petrochina,Beijing 100083,China;3.Chongqing Administration of Land,Resources and Housing,Chongqing 400000,China)
  • Received:2013-09-02 Revised:2013-11-29 Online:2014-08-10 Published:2014-08-10

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摘要：

渝东南地区黔江凹陷五峰组—龙马溪组页岩气的勘探仍处于初级阶段，储层特征与含气性关系仍不明确，开展五峰组—龙马溪组页岩的储层特征及含气性的研究，对评价研究区页岩气资源潜力具有重要意义。通过采集该套页岩岩心样品，完成详细的储层特征分析和含气性分析测试，包括岩石薄片鉴定、X-射线衍射、TOC分析、显微组分实验、氮气吸附实验、扫描电镜实验和现场解析等，结果表明，五峰组—龙马溪组页岩以黏土—粉砂级细粒沉积为主；页岩有机碳含量为0.22%~5.31%，成熟度为1.78%~2.93%，处于高—过成熟阶段，纳米级有机孔隙发育；矿物成分中脆性矿物含量为38.4%~86.7%，黏土矿物含量为12.1%~56.5%，其中微—纳米级无机孔隙较为发育，此外微裂缝的发育也对页岩气聚集和开发提供了有利条件。五峰组—龙马溪组页岩含气量为0.07~2.81m3/t，其底部富有机质页岩的含气量超过1m3/t。综合分析认为页岩TOC值和石英含量越高、长石和绿泥石含量越低时页岩中孔隙及比表面积越大，页岩含气量越大。
 

关键词: 渝东南地区, 五峰组&mdash, 龙马溪组, 储层特征, 微观孔隙, 扫描电镜, 含气性

Abstract:

The exploration of Wufeng-Longmaxi Formation shale in southeastern Chongqing is still in its infancy.The relationship between reservoir characteristics and hydrocarbon content is not explicit.Therefore,studies on the reservoir characteristics and the controlling factors of influencing hydrocarbon content are significant for the evaluation of shale gas resource potential.Through the thin section analysis,X-ray diffraction,TOCanalysis,maceral test,nitrogen adsorption test,scanning electron microscopy (SEM) and field adsorption test,the results reveal that the shale is clay- to silt-sized class deposition;total organic carbon varies from 0.22% to 5.31% at high to over mature stage which lead to thermal cracking of organic matter to form lots of nanoscale organic pore;mineral component mainly comprises of brittle minerals (38.4%-86.7%) and clay minerals (12.1%-56.5%);abundant micro-nanoscale inorganic porous develop inside of mineral grains and development of microfracture helped the accumulation for shale gas.The gas content is 0.07-2.81m3/t,over 1m3/t of which distributes in the bottom of the shale with abundant organic matter.Higher content of organic matter and quartz as well as lower content of feldspar and chlorite lead to higher porosity and specific surface area,which contributes to more gas content.
 

Key words: Southeastern Chongqing, Wufeng-Longmaxi Formation, Reservoir characteristics, Microscopic pore, SEM, Gas content

中图分类号: 

  • TE121.2
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