CSAMT法与微动测深法在漳州某区地热资源勘探中的应用

勘探区位于漳州市以东约40km处,属低丘陵剥蚀区及海积阶地,因区内开发程度高,地面普遍硬化。依据区内的地质、水文及构造资料,决定采用抗电磁干扰强的CSAMT法与施工较为便利的微动测深法勘测地下热源。通过分析隐伏储热构造在CSAMT法与微动测深法剖面图上的响应特征,确定波速相对较低且存在低阻异常区域为储热控水构造有利区。综合考虑野外施工条件,在CSAMT法1线与微动测深线交汇处钻孔验证,结果显示,孔底温度为30.9℃,出水量为1243.21m³/d,表明CSAMT法联合微动测深法可有效探测该地热资源。

Application of CSAMT and Microtremor Sounding in a Geothermal Resource Exploration Area,Zhangzhou

The exploration area is situated to the east of Zhangzhou City about 40km,a low hilly denudation land and marine-deposition terrace.Because of high exploitation level has caused general ground surface hardening.Based on geological,hydrological and structural data,the CSAMT with strong resistance to electromagnetic interference and the microtremor sounding with more convenient operation have been used to explore geothermal sources.Through analysis of concealed geothermal reservoir response features on CSAMT and microtremor sounding sections have identified the regions with wave velocity relatively low and low-resistivity anomalies as geothermal reservoir water control structure beneficial area.Integratedly considered field operation conditions have laid out verification borehole at the junction of CSAMY line I and microtremor sounding line.The drilling result has shown that borehole bottom temperature is 30.9℃,water yield 1243.21m³/d,thus indicated that CSAMT together with microtremor sounding can explore the geothermal resources effectively.