煤田地质与勘探2025，Vol.53Issue(2)：44-54,11.DOI:10.12363/issn.1001-1986.24.11.0676
延川南区块深部煤炭地下气化地质条件评价及有利区优选
Geological condition assessment and selection of optimal favorable areas for deep underground coal gasification in the Yanchuannan block
摘要
Abstract
[Objective and Methods]Geological condition assessment for underground coal gasification(UCG)allows for considerably reducing the risk of UCG projects,while scientific siting serves as a prerequisite for the success of UCG projects.To achieve the geological condition assessment for deep UCG and the selection of optimal favorable areas in the Yanchuannan block,this study quantified the indices of coal quality,coal seam occurrence,surrounding rocks,hy-drogeology,and structures in the No.2 coal seam in the study area.Employing the technique for order preference by sim-ilarity to an ideal solution(TOPSIS)method,this study performed mathematical assessments and grading of various ex-ploitation units.Finally,this study obtained comprehensive assessment results of favorable,relatively favorable,and po-tentially favorable areas for UCG.[Results]The results indicate that the No.2 coal seam in the study area was formed in a sedimentary environment of the delta plain facies.This coal seam consists primarily of medium-rank coals,including coking,lean,and meagre coals,exhibiting low average moisture and low average ash contents and a high yield of volat-ile constituents.In terms of sulfur content,the No.2 coal seam contains low-to high-sulfur coals.Furthermore,the No.2 coal seam manifests a considerable thickness,high stability,a low average gangue layer number,and low gangue coeffi-cients(i.e.,the ratio of the total gangue thickness to the total coal seam thickness),and simple structures,suggesting a stable moderately thick to thick coal seam with a relatively complete coal structure.The roof and floor of the No.2 coal seam are dominated by mudstones,and its surrounding rocks show high values of the comprehensive lithological index and high sealing performance.Faults in the coal seam exhibit moderate fractal dimension values overall,suggesting simple fault development and favorable conditions for exploitation.The study area exhibits surface water locally,with moderate hydrological fractal dimension values and high groundwater sealing coefficients.[Conclusions]Overall,the No.2 coal seam in the study area exhibits resource and geological conditions suitable for the implementation of UCG projects.Based on the distribution characteristics of structures,burial depths,rivers,and mine boundaries,as well as the description of geological exploration data,the No.2 coal seam can be divided into 11 exploitation units,with favorable areas for UCG primarily distributed in the northern part.Specifically,the most favorable areas consist of units Ⅴ and Ⅲin the north-central part,the relatively favorable areas include units Ⅰ,Ⅱ,Ⅳ,Ⅵ,Ⅶ,Ⅸ,and Ⅹ,and potentially favor-able areas comprise units Ⅷ and Ⅺ.关键词
煤炭地下气化(UCG)/深部地质条件评价/TOPSIS法/有利区优选/延川南Key words
underground coal gasification(UCG)/assessment of deep geological conditions/TOPSIS method/selection of optimal favorable areas/Yanchuannan block分类
地质学引用本文复制引用
李鑫,陈贞龙,郭涛,高小康,肖翠,金晓波,吴财芳,王芳芳..延川南区块深部煤炭地下气化地质条件评价及有利区优选[J].煤田地质与勘探,2025,53(2):44-54,11.基金项目
中国石化科技部基础前瞻项目(P22186) （P22186）
国家自然科学基金项目(42372182) （42372182）
