摘要
深层煤层气资源是我国煤层气产业规模发展的重要基础和接替领域,但深层煤层气的主要赋存状态、吸附/解吸、扩散/渗流特性及富集规律尚不清楚,至今仍处于勘探开发试验阶段。为了探索和明确深层煤层气关键评价地质要素和勘探开发方向,以河北大城区块南部深层煤层气开发有利区的成功识别为基础,分析了风化作用对深层倾斜煤层物性和含气性的影响,对比讨论了不同深度试验井的压裂和试采效果,总结了该区深层煤层气的开发有利模式。研究结果表明:①大城区块石炭系—二叠系主力三、六煤组Ro介于0.7%~1.2%,以气、肥煤为主,含气量大于6 m^(3)/t;②煤层受风化作用的影响,力学强度降低,质地疏松,多呈碎块、光泽暗淡;③三煤组风化边界埋深介于1800~2200 m,六煤组风化边界埋深介于1800~2000 m;④试验井证实风化带边界附近埋深相对较浅区域中煤层气产量较高,生产稳定,产气潜力可观;⑤在河北大城区块南部深层倾斜煤层中存在一段以风化带边界为下限的煤层气开发有利区。结论认为,该研究成果不仅为区内深层煤层气的开发指明了方向,还为其他深层煤层气地区的开发提供了借鉴。
Deep coalbed methane resources are an important foundation and replacement field for the large-scale development of coalbed methane industry in China,but the main existence states,adsorption/desorption,diffusion and seepage characteristics and enrichment laws of deep coalbed methane have not been recognized clearly and the exploration and development of deep coalbed methane is still in the test stage.In order to explore and determine the key geological factors and exploration and development direction of deep coalbed methane,this paper analyzes the influence of weathering on the physical property and gas bearing property of deep inclined coal seams based on the successful identification of the favorable deep coalbed methane development zone in the southern Dacheng Block of Hebei Province.In addition,the fracturing and production test results of test wells at different depths are comparatively discussed,and a favorable development model of deep coalbed methane in this area is established.And the following research results are obtained.First,No.3 and No.6 coal formations of Carboniferous-Permian in the Dacheng Block are dominated by gas coal and fat coal,their Ro ranges from 0.7%to 1.2%and gas content exceeds 6 m^(3)/t.Second,due to the effect of weathering,coal seams have low mechanical strength and loose texture,mostly in fragments and granular shapes,with dim gloss and grayish color.Third,the burial depth of weathering boundary is 1800-2200 m in No.3 coal formation and 1800-2000 m in No.6 coal formation.Fourth,the test wells reveal that coalbed methane production in the shallower area near the boundary of the weathered zone is stable with a higher production rate and considerable gas production potential.Fifth,there is a favorable coalbed methane development zone with the boundary of weathering zone as the lower limit in the deep inclined coal seam in the southern Dacheng Block of Hebei Province.In conclusion,the research results not only point out the direction of deep coalbed methane development in this block,but also provide reference for the development of deep coalbed methane in other areas.
作者
张鹏豹
肖宇航
朱庆忠
刘忠
陈彦君
韩峰
吕帅锋
刘振兴
关小曲
周智
ZHANG Pengbao;XIAO Yuhang;ZHU Qingzhong;LIU Zhong;CHEN Yanjun;HAN Feng;LYU Shuaifeng;LIU Zhenxing;GUAN Xiaoqu;ZHOU Zhi(Exploration and Development Research Institute,PetroChina Huabei Oilfield Company,Renqiu,Hebei 062552,China;CNPC CBM Exploration and Development Pilot Test Base,Renqiu,Hebei 062552,China;Faculty of Earth Resources,China University of Geosciences(Wuhan),Wuhan,Hubei 430000,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2021年第11期86-96,共11页
Natural Gas Industry
基金
国家科技重大专项“华北地区中低煤阶煤层气规模开发区块优选评价”(编号:2016ZX05041-003)
中国石油天然气股份有限公司重大科技专项“煤层气勘探开发关键技术研究与应用”(编号:2017E-1404)。
关键词
河北大城区块
深层煤层气
倾斜煤层
风化作用
储层物性与含气性
试采效果
开发有利模式
开发有利区
Dacheng Block of Hebei Province
Deep coalbed methane
Inclined coal seam
Weathering
Reservoir physical and gas bearing property
Production test result
Favorable development model
Favorable development zone
作者简介
张鹏豹,1986年生,高级工程师,主要从事煤层气勘探评价研究工作。地址:(062552)河北省任丘市建设中路1号。ORCID:0000-0002-6573-4131。E-mail:yjzx_zpb@petrochina.com.cn;通信作者:肖宇航,1990年生,博士,主要从事煤层气勘探开发研究工作。地址:(062552)河北省任丘市建设中路1号。ORCID:0000-0002-1311-0140。E-mail:xiaoyh220151@foxmail.com。
