CAJ | 학술논문

地应力是指岩土体内一点固有的应力状态，煤层气是一种以吸附状态为主储存于煤层及其围岩中的非常规天然气。我国煤层气勘探与开发还处于初级阶段，而地应力对煤层勘探与开发有十分显著的影响，其影响主要包括以下三个方面：①地应力对煤储层渗透性、储层压力的影响；②地应力对煤层气的吸附、解吸、扩散和渗流的影响。地应力增加，储层压力增大，煤层吸附气体的量增多，但渗透率降低，给煤储层的排水、降压及煤层气的解吸、运移、产出造成一定困难；③地应力对天然裂缝目前在地下的附存状态及有效性，以及人工压裂裂缝的形态和延伸方向的影响等。所以十分有必要系统论述地应力对煤层气勘探与开发的影响。
지응력시지암토체내일점고유적응력상태，매층기시일충이흡부상태위주저존우매층급기위암중적비상규천연기。아국매층기감탐여개발환처우초급계단，이지응력대매층감탐여개발유십분현저적영향，기영향주요포괄이하삼개방면：①지응력대매저층삼투성、저층압력적영향；②지응력대매층기적흡부、해흡、확산화삼류적영향。지응력증가，저층압력증대，매층흡부기체적량증다，단삼투솔강저，급매저층적배수、강압급매층기적해흡、운이、산출조성일정곤난；③지응력대천연렬봉목전재지하적부존상태급유효성，이급인공압렬렬봉적형태화연신방향적영향등。소이십분유필요계통논술지응력대매층기감탐여개발적영향。
The crustal stress is the state of stress of a point bears in the rock mass or soil body .Coal bed methane is a kind of unconventional gas resources that exist in the coal bed or its surrounding rock in the form of adsorption state .The coal bed methane exploration and developing is still at the primary stage in our country ,and the crustal stress has great influence on coal bed methane exploration and development ,and the influence mainly has three aspects as follows .Firstly ,the crustal stress has great influence on permeability and pressure of coal reservoir .Secondly ,the crustal stress has great influence on adsorption , desorption ,diffusion ,and seepage of coal bed methane .When crustal stress increases ,the pressure and the amount of adsorbed gas increases ,but the permeability decreases ,and this goes against drainage ,pressure lowering ,and the desorption ,migration ,and production of coal bed methane .Thirdly ,the crustal stress has great influence on the underground existence state and effectiveness of natural fractures at present ,and it also influences the shape and extension direction of hydraulic fracture .So ,it is very necessary to summarize the influence of the crustal stress on coal bed methane exploration and development .