济南北部地热田地热地质特征浅析

济南北部地热田地热资源类型属于层状裂隙岩溶型，热源是北部齐河-广饶断裂的沟通导热，盖层是第四系、新近系、石炭-二叠系、侏罗系。可利用的、具有开发价值的热储层为奥陶系灰岩热储，该热储层顶板埋深在700～2500m左右，热储层厚度由南向北逐渐增大，单井涌水量2000m^3／d左右，孔口水温一般在38～57℃，地热田东部地热水矿化度1．4～3.5g／L左右，西部5．1～7.2g／L左右，地热水中富含氟、锶、偏硅酸等微量元素，具腐蚀性，结垢性弱，具较好的开发利用价值。经计算奥陶系热储层单井可采资源量为7．3×10^5m^3／a，合理井间距为5000m。

Analysis on Geological Characteristics of Geothermal Field in North Part of Jinan City

Geothermal field in north of Jinan city belongs to layered fractured karst type, and h.eat conduction in north of Qihe- Guangrao fault is its heat source. Quaternary, early Tertiary, Carboniferous-Permian and the Jurassic period are its covering layers. Ordovician limestone thermal reservoir is valuable thermal reservoir. Its thickness gradually increases from south to north, and the top of thermal reservoir buried in 700-2500m deep under the ground. Single well amount of water flow is 2000m^3 , and temperature of water in hole top is 38-57℃. Mineralization degree of hot water in east of the geothermal field is about 1.4-3.5g/L, while it is about 5.1-7.2g/L in the west part. Hot water contains abundant microelements, such as F, Sr, silicic acid and so on with corrosion character and weak incrustation characteristics. It has good exploitation value. It is measured that single well workable reserve in Ordovician thermal reservoir is 7.3 × 10^5m^3/y, and reasonable distance between wells is 5000m.