石油学报 ›› 2014, Vol. 35 ›› Issue (5): 839-846.DOI: 10.7623/syxb201405003

• 地质勘探 • 上一篇    下一篇

湘西北常页1井下寒武统牛蹄塘组页岩气聚集条件及含气特征

林拓1,2, 张金川1,2, 李博3, 杨升宇1,2, 何伟1,2, 唐玄1,2, 马良荣3, 裴松伟1,2   

  1. 1. 中国地质大学能源学院 北京 100083;
    2. 页岩气勘查与评价国土资源部重点实验室 北京 100083;
    3. 中国华电工程(集团)有限公司 北京 100035
  • 收稿日期:2014-04-06 修回日期:2014-07-23 出版日期:2014-09-25 发布日期:2014-08-05
  • 通讯作者: 张金川,男,1964年11月生,1986年毕业于成都地质学院,现为中国地质大学(北京)能源学院教授、博士生导师,主要从事油气成藏及油气(非常规油气)资源评价工作。Email:zhangjc@cugb.edu.cn
  • 作者简介:林拓,男,1984年5月生,2007年毕业于中国地质大学(北京)石油工程专业,现为中国地质大学(北京)能源学院博士研究生,主要从事页岩气地质及资源评价研究工作。Email:everdeer@163.com
  • 基金资助:

    国家重大科技专项 (2009GYXQ)和国家自然科学基金项目(No.41102088)资助。

Shale gas accumulation conditions and gas-bearing properties of the Lower Cambrian Niutitang Formation in Well Changye 1, northwestern Hunan

Lin Tuo1,2, Zhang Jinchuan1,2, Li Bo3, Yang Shengyu1,2, He Wei1,2, Tang Xuan1,2, Ma Liangrong3, Pei Songwei1,2   

  1. 1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    2. Key Laboratory of Shale Gas Exploration & Evaluation, Ministry of Land and Resources, Beijing 100083, China;
    3. China Huadian Engineering Co. Ltd., Beijing 100035, China
  • Received:2014-04-06 Revised:2014-07-23 Online:2014-09-25 Published:2014-08-05

摘要:

为评价湘西北地区下寒武统牛蹄塘组页岩气聚集条件及含气性,优选并实施钻探了湖南省第一口以牛蹄塘组为目的层段的页岩气参数井——常页1井,累计揭示了牛蹄塘组黑色页岩层系真厚度674.5 m,是目前中国单井钻遇的最大厚度黑色页岩层系。通过岩心样品有机地球化学、岩石矿物学、储层物性等实验分析,认为常页1井牛蹄塘组黑色页岩具有机碳含量高(平均为3.9%)、成熟度适中(等效Ro平均为2.6%)、脆性矿物含量高(石英含量平均为50.1%)、黏土矿物含量低(平均为32.4%)、低孔低渗(孔隙度、渗透率平均分别为1.7%、1.32×10-3mD)、中小孔及裂缝发育的特征,具有良好的页岩气聚集条件。岩心现场解析实验和等温吸附实验都显示出常页1井具有良好的含气性,且整体上含气量随深度的增大而增加,其中井段1 100~1 250 m的黑色页岩段平均有机碳含量高达10.1%,现场解析总含气量为0.5~2.1 m3/t,等温吸附含气量为3.7~6.4 m3/t,是该井页岩气发育最有利的深度,显示出以常页1井为代表的湘西北牛蹄塘组具有良好的页岩气勘探开发潜力,鉴于其沉积厚度巨大,应优先对牛蹄塘组中下部黑色页岩进行勘探开发。

关键词: 页岩气, 常页1井, 湘西北, 牛蹄塘组, 含气性

Abstract:

This study evaluates shale gas accumulation conditions and gas-bearing properties of the Lower Cambrian Niutitang Formaion in northwestern Hunan, China. An optimal parameter well of shale gas in the Niutitang Formaion, Changye 1, was selected and drilled for the first time in Hunan Province. Collectively, it revealed the presence of dark shale series in the Niutitang Formation up to 674.5 m (true thickness), i.e., the thickest black shale series encountered during single-well drilling in China up to now. Core sampling and experimental analysis regarding organic geochemistry, rock mineralogy and reservoir properties show that the black shale of Niutitang Formation features high organic carbon content (average TOC content, 3.9 %), moderate organic maturity (equivalent Ro, 2.6 %), high brittle mineral content (quartz content, 50.1 %), low clay mineral content (average clay content, 32.4 %), poor porosity (1.7 %) and permeability (1.32×10-3mD), and well-developed meso-/micropores and faults, which provide good conditions for shale gas accumulation in Well Changye 1. The well on-site desorption and isothermal adsorption tests show that the black shale of Niutitang Formation has good gas-bearing properties, with gas content generally increasing with depth. In Well Changye 1, the depth interval most favorable for shale gas accumulation is 1 100-1 250 m, as indicated by the average TOC content up to 10.1 % and the gas contents of 0.5-2.1 (well on-site desorption) and 3.7-6.4 m3/t (isothermal adsorption). The Niutitang Formation in northwestern Hunan, as represented by Well Changye 1, has good prospect for shale gas exploration. Considering its huge sedimentary thickness, the black shale of Niutitang Formation in the middle-lower part should be given priority for exploration.

Key words: shale gas, Well Changye 1, northwestern Hunan, Lower Cambrian, gas-bearing properties

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