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通过对沥鼻峡背斜地层含水性、隔水性、地下水流向及其水化学特征的研究,得出了该区地下水的径流特征及其水力联系,并据此研究了该区水文地质对煤层气富集的控制规律。研究表明,沥鼻峡背斜矿区属断块型背斜水压封闭气藏。本区浅部含水层由大气降水控制,地下水径流活跃,就近排泄,对煤层气基本无影响;中部地层含水性弱,水流滞缓,对煤层气具有顶底板水网络状封闭作用;深部地层含水性弱,水流停滞,对煤层气具有底板水网络封闭作用;断层大多为上部导水、下部阻水的逆断层,上部断层水对煤层气具有压力封堵作用。此外,岩性封闭对煤层气的富集也起到了积极的作用。
By studying the water-bearing property, the water-holding property, the groundwater flow direction and the hydrochemical characteristics of the anticline in the Libaxia Gorge, the runoff characteristics and hydraulic relationships of the groundwater in this area are obtained. Based on this, Enrichment control law. The research shows that the Libaxia anticline mining area belongs to the fault-block anticline hydraulic closed gas reservoir. The shallow aquifers in this area are controlled by the atmospheric precipitation. The runoff of groundwater is active and exits nearby with little effect on the CBM. The water in the middle layer is weak and the water flow slows down. It has the top-plate water network sealing effect on the coalbed methane. Weakness and stagnant water flow, which has the sealing effect on the CBM network; the fault is mostly the reverse fault with the upper water-conducting and the lower water-blocking, and the upper fault water has the pressure blocking effect on the CBM. In addition, lithologic sealing also played a positive role in CBM enrichment.