综合物探在海石湾地区地热勘查中的应用

在兰州海石湾地区进行地热勘查,在分析地热形成条件的基础上,结合可控源音频大地电磁测深、大地电磁测深、伽马能谱测量等物探方法,查清了区内盖层厚度、热储层埋深及断裂构造位置,避免了单一方法的片面性和盲目性,为钻探提供了依据。经钻探验证,井孔地层、含水层与物探推断基本吻合,井口水温60℃,涌水量90 m3/h,主要为断裂型带状热储。研究结果为今后在类似地区进行地热勘探提供了有参考价值的经验和实例。

The application of integrated geophysical exploration to geothermal exploration in Haishiwan area

Based on an analysis of the conditions of geothermal formation in Haishiwan area,the geophysical prospecting methods of CSAMT( Controlled Source Audio Magnetotelluric),MT( Magnetotelluric) and gamma ray spectrometry were used to verify each other and,as a result,cover layer thickness,the buried depth of thermal reservoir and the fracture location were found,which avoids oneside trend and blindness of a single method and provides a basis for drilling and obtaining good results in exploration. Drilling verification shows that well hole strata and water-bearing horizon are basically consistent with the results of geophysical inference,the water temperature of well mouth is 60℃,the water gushing amount is 90 m3/h,and the thermal reservoir is a fault type banded reservoir. The result provides valuable experience and example for geothermal exploration in similar areas in the future.