煤炭地下气化资源条件的评价指标分析

Analysis on evaluation index of coal underground gasification resource conditions

为了客观评价煤炭地下气化的可行性,建立煤炭地下气化资源条件的4个一级评价指标,地质构造特征、煤层赋存特征、水文地质条件、煤岩煤质特征,将4个一级指标细化成煤层厚度等20个二级评级指标。基于评价体系分析宁正矿区煤6层实施地下气化的可行性,分析发现煤6层地质构造简单,煤层赋存稳定可靠,煤岩煤质优良,地下水影响较小,顶底板岩性以泥岩、粉砂岩为主,污染物渗透能力弱,充分体现煤6层实施煤炭地下气化资源优势明显。

In order to objectively evaluate the feasibility of underground coal gasification, four first-level evaluation indicators for coal underground gasification resource conditions was set up, including geological structure characteristics,coal seam occurrence characteristics, hydrogeological conditions, coal and rock coal quality characteristics. The first-level indicators were refined into 20 secondary rating indicators such as coal seam thickness. Based on the evaluation system, the feasibility of underground gasification in the 6 th coal seam of Ningzheng Mining Area was analyzed. It was found that the coal seam with a simple geological structure, the coal seam was stable and reliable, the coal and rock quality was excellent,the groundwater impact was small, and the lithology of the roof and floor was considered as mudstone, mainly siltstone, the ability of pollutants to penetrate was weak, fully demonstrating the obvious advantages of implementing coal underground gasification resources on the 6 th floor of coal.