黔西肥田区块地下水动力条件与煤层气有序开发  

Groundwater dynamic conditions and orderly coalbed methane development of Feitian Block in Western Guizhou,South China

作　　者：郭晨[1] 秦勇[1] 易同生[2] 高弟[2] 洪愿进 雷波[1] 

机构地区：[1]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221116 [2]贵州省煤田地质局,贵州贵阳550006

出　　处：《煤炭学报》2014年第1期115-123,共9页Journal of China Coal Society

基　　金：国家自然科学基金重点资助项目(40730422);国家科技重大专项资助项目(2011ZX05034);煤层气资源与成藏过程教育部重点实验室(中国矿业大学)开放基金资助项目(2013-009)

摘　　要：黔西是我国南方煤层气资源最为丰富的地区,客观认识多层叠置含煤层气系统控制下的煤层群有效排水降压和有序开发方法,是实现该区煤层气高效开发的关键。笔者以黔西织纳煤田肥田区块为研究对象,精细分析了含煤地层水文地质条件以及垂向上不同层段开发条件的差异性,基于抽水试验数据提取了视储层压力、压力梯度、单位涌水量、渗透系数、影响半径等有用信息,比较了不同层段水文地质条件在三维空间上的差异,采用模糊数学综合评判法建立了煤层气开发优先度评价因子,据此对不同层段煤层气开发潜力和开发顺序进行了探讨。认为肥二井田和肥三井田总体开发条件优于肥一井田,其中肥二中煤组、肥三上煤组和中煤组是较有利开发层段,各层段递进开发顺序为:肥三井田上段→肥二井田中段→肥三井田中段→肥三井田下段→肥二井田下段→肥二井田上段→肥一井田上段/中段→肥一井田下段。Western Guizhou has the most abundant coalbed methane resources in South China. In order to efficiently exploit the coalbed methane in this area, it is important to understand the drainage decompression and orderly develop- ment methods of coal seam groups under the control of Unattached multiple superposed CBM-bearing system. This pa- per took Feitian Block of Zhina coal field in Western Guizhou as the researching area, analyzing the meticulous hydro- geological condition of coal-bearing strata and the difference of development condition of different coal seam groups in vertical. Based on pumping test data from previous coal exploration, useful information was generated, including the ap- parent reservoir pressure, pressure gradient, unit water inflow, permeability coefficient and radius of influence. The difference of hydrogeologieal condition in different parts of coal-bearing strata in three-dimensional space was com- pared. Eventually, the factor of evaluating CBM development priority was established through fuzzy mathematics syn- thetical judgement. Accordingly, the developing potential and development order of different coal seam groups in verti- cal of the three coal mine areas was discussed. It is concluded that the Feitian 2 and Feitian 3 mine areas have a better CBM development condition than Feitian 1, among which Feitian 2 medium part, Feitian 3 upper part and medium part are prior for CBM development. Generally, The development order of each part of coal-bearing strata of each coal mine area is：Feitian 3 upper part→Feitian 2 medium part→Feitian 3 medium part→Feitian 3 lower part→Feitian 2 lower part→Feitian 2 upper part→Feitian 1 upper part/Feitian 1 medium part→Feitian 1 lower part.

关 键 词：肥田 水文地质 多层叠置含煤层气系统 有序开发 模糊数学 

分 类 号：P618.11[天文地球—矿床学]