钻探工程2024，Vol.51Issue(z1)：124-131,8.DOI:10.12143/j.ztgc.2024.S1.018
贵州裸露岩溶地下河系统污染通道识别钻探技术
Drilling techniques for pollution pathway identification in exposed karst subterranean river systems in Guizhou
摘要
Abstract
The exposed karst region in Guizhou features a complex network of underground river systems characterized by extensive karst development and intricate hydrogeological conditions.These systems are highly susceptible to severe contamination from surface pollutant sources due to percolation of leachates.The pollution pathways within these underground river systems are challenging to precisely identify owing to their concealed nature,narrow spatial extent,and anisotropy.To expose and identify contaminated channels,drilling operations face several difficulties,including alternating soft and hard layers,non-uniform weak zones,significant karstic formations causing borehole deviation,large cavities leading to casing misalignment or breakage,and slow tracer migration due to low natural hydraulic gradients in the underground river systems.Consequently,the identification and exposure of pollution pathways are both difficult and inefficient.To address these challenges,several technical measures were employed,including anti-deviation and vertical maintenance techniques,large karst casing passage and sealing,and in-hole activation to promote tracer migration.These measures ensured the verticality of exploration boreholes,facilitating accurate logging,tracer testing,and water sampling.This approach enabled the precise exposure and rapid identification of pollution pathways.The methodologies and technical measures adopted in this study offer significant reference and practical insights for the precise exposure and efficient identification of pollution pathways in similar geological formations.关键词
地下河系统/污染通道/精准识别/防斜保直/大溶洞穿越/孔内激化/裸露岩溶区Key words
underground river systems/pollution pathways/precise identification/anti-deviation and vertical maintenance/large karst cavity passage/in-hole activation/exposed karst region分类
天文与地球科学引用本文复制引用
陈涛,李强,江峰,赵华宣,陈浩,贾玉川,王若帆..贵州裸露岩溶地下河系统污染通道识别钻探技术[J].钻探工程,2024,51(z1):124-131,8.基金项目
贵州省科学技术厅重大科技成果转化项目"地下河走向物理化学探测及数字地图绘制技术集成与应用"(编号:黔科合成果[2023]重大006) （编号:黔科合成果[2023]重大006）
贵州省地质矿产勘查开发局科研项目"贵州岩溶地下水环境污染勘查与地学治理关键技术研究"(黔地矿科合(2022)重大2号) （黔地矿科合(2022）
