煤田地质与勘探2025，Vol.53Issue(4)：46-57,12.DOI:10.12363/issn.1001-1986.25.01.0053
煤层顶板水平井分段水力压裂微震监测与评价
Microseismic monitoring and assessment of segmented hydraulic fracturing of horizontal wells in coal seam roofs
摘要
Abstract
[Background]Microseismic monitoring,a non-destructive monitoring technique,has been extensively ap-plied in the hydraulic fracturing performance assessment of coal seams.However,little attention is paid to the vertical wave velocity gradients in media in the same layer during the construction of layered wave velocity models.This leads to limited precision of travel time calculation and microseismic source localization,thus affecting the assessment accur-acy of the hydraulic fracturing of coal seams.[Objective and Methods]Based on the coal seam segmented hydraulic fracturing project in a mine in Anhui,this study proposes an improved velocity model based on the Universal Kriging in-terpolation method.By incorporating anisotropy factors,the velocity values in the grid cells of the same layer are inter-polated on the basis of the sonic logging velocity model,to characterize the anisotropic features,which are then used to correct the elastic wave propagation path.The effectiveness of the improved velocity model is validated by comparing the source location accuracy of known perforation events.Based on this model,further calculations of reservoir per-meability and Stimulated Reservoir Volume(SRV)were performed,achieving a comprehensive evaluation of the coal seam hydraulic fracturing effect.[Results and Conclusions]The results indicate that compared to the linear interpola-tion method,the universal Kriging interpolation method effectively enhanced the microseismic source localization accur-acy.For the same perfo-ration point,the localization errors yielded by the improved wave velocity model decreased by up to 7.22 m compared to those of the initial layered wave velocity model.The hydraulic fracturing performance assess-ment reveals that the microseismic source localization accuracy after wave velocity interpolation was improved and that the vertical discreteness of microseismic events was effectively restricted,with the effective influence radius of various fracturing segments determined at about 90 m.The distribution density of microseismic events and the permeability var-ied across the coal seam area,with high post-fracturing permeability observed near the wellbore of various fracturing segments.The SRVs in horizontal well No.1 totaled 1.977×107 m3,and the SRV and hydraulic fracture length were positively correlated with the total volume of injected fluids.Overall,the hydraulic fracturing performance based on mi-croseismic assessment aligns with the expectation.关键词
水力压裂/微震监测/各向异性/泛克里金插值法/波速模型/网格搜索Key words
hydraulic fracturing/microseismic monitoring/anisotropy/universal Kriging interpolation method/wave ve-locity model/grid search分类
矿山工程引用本文复制引用
李全贵,彭淑悦,梁运培,李文禧,钱亚楠,程春晖,余长君,湛金飞..煤层顶板水平井分段水力压裂微震监测与评价[J].煤田地质与勘探,2025,53(4):46-57,12.基金项目
国家自然科学基金面上项目(52474210) （52474210）
