摘要
为评估煤储层整体的渗透性,引入岩体力学中的地质强度指标(Geological Strength Index,GSI)来表征煤体结构。挑选有代表性的不同煤体结构煤样,与GSI图版进行比对,获取样品的GSI值,并测试相应的渗透率。地质强度指标(GSI)与渗透率相关性明显,拟合相关系数R2=0.84,表明利用GSI来估算煤储层渗透率是可行的。GSI与渗透率关系表明,水力压裂增透仅适用于Ⅰ和Ⅱ类煤,对寺家庄煤矿15号煤层来说,储层改造的最优目标为GSIc=52.7。
GSI（Geological Strength Index） method in rock mechanics was introduced for assessing the overall permeability of coal reservoirs.The representative coal samples were selected from different coal deformation,and GSI value was estimated when comparing GSI standard plates and the corresponding permeability was tested.Relationship between GSI and permeability is obviously related to a correlation coefficient,R2 = 0.84,which indicates coal reservoir permeability can be estimated by GSI of coal mass.Relationship between GSI and permeability shows only Ⅰand Ⅱ categories coal can be reconstructed by hydraulic fracturing,and the optimal goal of reservoir reconstruction is GSIc = 52.7 for No.15 coal seam of Sijiazhuang Coal Mine.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2010年第8期1319-1322,共4页
Journal of China Coal Society
基金
国家自然科学基金资助项目(40902044)
长江学者和创新团队发展计划(IRT0618)
河南省重点实验室项目(OTMP0901)
关键词
煤储层
渗透率
地质强度指标
煤体结构
水力压裂
coal reservoir
permeability
geological strength index
coal deformation
hydraulic fracturing
