沁水盆地寿阳区块3号和9号煤层合层排采的可行性研究

Feasibility Study of Multi-layer Drainage for Nos.3 and 9 Coal Seams in Shouyang Block,Qinshui Basin

寿阳区块煤储层具有层数多、单层厚度小、产能低、开采难度大的特征,为降低成本、提高煤层气资源采收率,对该区主要目标层3号和9号煤层进行合层开采是制定开发方案时的首选。在系统分析煤层气直井合层排采的关键控制因素基础上,认为煤岩及顶底板岩石力学性质、储层压力梯度、临界解吸压力、渗透率、煤储层供液能力是合层排采的主控因素,根据区内煤层气井勘探开发资料及主控因素分析了区块合层排采的可行性,指出了适合3号和9号煤层合层排采的有利区域。

The CBM coal reservoirs in the Shouyang block have characteristics of multiple layers, small single layer thickness, low pro- ductivity and hard to exploit. To reduce the cost, improve CBM resource recovery, the multi-layer drainage for the main target Nos.3 and 9 coal seams is the preferred scheme. Based on the key control factors of vertical well multi-layer drainage systematic analysis, consid- ered that the coal and roof/floor rock mechanical property, reservoir pressure gradient, critical desorption pressure, permeability, coal reservoir fluid supply capacity are the key control factors. According to the CBM well exploration and exploitation data in the area and key control factors analyzed feasibility of multi-layer drainage for Nos.3 and 9 coal seams in the block, and pointed out the most advanta- geous range.