论深部煤层气基本地质问题

doi:10.7623/syxb201601013

石油学报 ›› 2016, Vol. 37 ›› Issue (1): 125-136.DOI: 10.7623/syxb201601013

论深部煤层气基本地质问题

秦勇, 申建

中国矿业大学煤层气资源与成藏过程教育部重点实验室江苏徐州 221008

收稿日期:2015-07-30 修回日期:2015-12-02 出版日期:2016-01-25 发布日期:2016-02-02
通讯作者: 秦勇,男,1957年6月生,1981年获焦作矿业学院学士学位,1992年获中国矿业大学博士学位,现任中国矿业大学教授、副校长、煤层气资源与成藏过程教育部重点实验室主任,主要从事能源地质教学和非常规天然气地质研究工作。Email:yongqin@cumt.edu.cn
作者简介:秦勇,男,1957年6月生,1981年获焦作矿业学院学士学位,1992年获中国矿业大学博士学位,现任中国矿业大学教授、副校长、煤层气资源与成藏过程教育部重点实验室主任,主要从事能源地质教学和非常规天然气地质研究工作。Email:yongqin@cumt.edu.cn
基金资助:
国家自然科学基金重点项目(No.41530314、No.U1361207)、国家重大科技专项(2011ZX05034)资助。

On the fundamental issues of deep coalbed methane geology

Qin Yong, Shen Jian

Key Laboratory of CBM Resources and Reservoiring Process, Ministry of Education, China University of Mining and Technology, Jiangsu Xuzhou, 221008, China

Received:2015-07-30 Revised:2015-12-02 Online:2016-01-25 Published:2016-02-02

摘要/Abstract

摘要：

深部煤层气资源是中国煤层气产业规模性发展的重要基础,但目前关于"深部"的含义、定义、特殊性等基本地质问题尚无明确表述。前期探索成果显示,深部煤储层地质条件的特殊性起源于较高的地应力和地层温度,由此导致深部煤层可压缩性高、渗透性低和弹性低。研究认为:在科学层面,煤层气领域的"深部"不仅是一种深度,更重要的是一种状态,这种状态取决于地应力、温度及煤(有机)储层三重地层状态;在操作层面,定义深部与浅部之间的临界深度,需要考虑地应力状态转换、煤吸附性(含气量)和煤岩力学性质三重地质因素。近期研究进展为解决本领域基本地质问题提供了新的启示,阐释游离气量在深部低阶煤储层含气量中的重要性,探讨深部煤层气可解吸性与产出阶段敏感性之间关系,分析变孔隙压缩系数对深部低阶煤储层渗透率的深刻影响,建立基于成藏效应的深部煤层气有利区优选方法。今后几年期间,深部煤层气勘探开发仍需解决4方面地质问题:1深部煤层气资源潜力深化评价与再认识;2深部煤储层可改造性及其与深部基本地质特点的耦合效应;3深部应力场、温度场、化学场作用下煤层气高效开采技术原理的地质控制;4深部煤系"三气"共生特性、共探方法与共采有效性地质评价。问题的实质,在于发展出一套适应于深部地层条件的煤层气勘探与开发地质技术方法。

关键词: 深部煤层气, 基本地质问题, 定义, 进展, 探索方向

Abstract:

Deep coalbed methane(CBM) resources is an important basis for the scale development of the CBM industry in China,but some basic geological problems such as the meaning,definition and the particularities on the "deep" are still not clear.Preliminary investigation shows that the particularity of deep coal reservoir is resulted from higher strata temperature and pressure,which bring about higher compressibility,lower permeability and lower elasticity of deep coals.At the scientific level,the "deep" in CBM fields means not only a depth,more important is a state,which is dependent on threefold formation states the including stress,temperature and(organic) reservoir.At the operational level,the definition of the critical depth between deep and shallow CBM needs to takes into account three geological factors such as the stress state conversion,coal adsorption(gas content) and mechanical properties of coals.Recent research progress provides new insights for solving the basic geological problems.The importance of the free gas to the gas content of deep low-rank coal reservoir is explained,the relationship between the desorption and output stage sensitivity of deep CBM is discussed,the profound impact of variable pore compression coefficient on deep low-rank coal reservoir permeability is analyzed,and the seek-optimizing method of favorable deep-CBM zone based on the accumulation effects is set up.It is suggested that still the geological problems of the four aspects need to solve for deep CBM exploration and development.The first is the deepening evaluation and recognition of deep CBM resource potential,the second is the coupling effect of the basic deep geological characteristics to deep coal reservoir,the third is the geological control of the principles of efficient deep CBM development technology under deep strata stress field,temperature field and chemical field,and the fourth is the geological evaluation of the symbiotic characteristics,co-exploring method and co-mining effectiveness of deep CBM,tight sandstone gas and shale gas in coal measure.

Key words: deep CBM, basic geological issue, definition, research progress, future investigation

中图分类号:

TE122

秦勇, 申建. 论深部煤层气基本地质问题[J]. 石油学报, 2016, 37(1): 125-136.

Qin Yong, Shen Jian. On the fundamental issues of deep coalbed methane geology[J]. Acta Petrolei Sinica, 2016, 37(1): 125-136.

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论深部煤层气基本地质问题

On the fundamental issues of deep coalbed methane geology

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