沂蒙山区中北部侵入岩蓄水构造的富水特征及供水意义

Water Rich Characteristics and Water Supply Significance of Intrusive Rock Water Storage Structures in the Middle and Northern Yimeng Mountain Area

摘要:

通过对沂水县侵入岩贫水地区开展水文地质调查，综合运用物探、水文地质钻探、抽水试验等工作手段，分析侵入岩分布区地下水赋存规律，确定了侵入岩分布区主要蓄水构造类型包括断裂型、韧性剪切带型、侵入体接触带型等。断裂型蓄水构造一般呈线状发育，富水性受断层的力学性质、发育规模及汇水条件等因素控制，单井涌水量差异较大；韧性剪切带型蓄水构造呈面状发育，含水层埋深一般小于65m，单井涌水量一般大于100m3/d；侵入体接触带型蓄水构造发育特征因侵入体的形状而异，一般呈带状，富水性受接触带连通性、围岩岩性及汇水条件等因素控制，单井涌水量一般100~500m3/d。通过分析不同蓄水构造类型地下水的补、径、排特征、富水情况及其供水意义，对侵入岩缺水地区找水打井具有较好的借鉴意义。

Abstract:

Through hydrogeological survey in water deficient areas of intrusive rocks in Yishui county,by using geophysical prospecting, hydrogeological drilling, pumping test and other working means, occurrence regularity of groundwater has been analyzed, and water storage structure modes have been determined, including fracture zone, ductile shear zone and intrusive contact zone. The fracture type water storage structure is generally linear, and its water yield is controlled by mechanical properties, development scale and catchment conditions of the fault, and the water inflow of a single well varies greatly. The ductile shear zone type water storage structure is developed in a plane shape, the buried depth of the aquifer is generally less than 65m, and the water inflow of a single well is generally greater than 100m3/d. The development characteristics of intrusive contact zone type water storage structure vary with the shape of intrusive body, and it is generally banded. The water abundance is controlled by the connectivity of contact zone, lithology of surrounding rock and catchment conditions, and the water inflow of single well is generally 100~500m3/d.Through analysis on recharge, runoff and discharge of groundwater, water-rich characteristics and water supply significance of different storage structures, suggestions for water prospecting and well drilling in water deficient areas of intrusive rocks have been put forward.