CSAMT在沿海围垦区地热勘查中的应用

摘要

Rudong area is rich in saline water characterized by low resistivity, so it is difficult to use tradition DC electrical methods in deep regional survey. V8 has high-power and CSAMT has strong penetrating capability, so they can improve the resolution when the density of frequency increases. In combination with the data of geology and geophysical prospecting, we can infer the structure of heat source water in low-resistivity covers. The results obtained by the authors show that the structure is a good tunnel for heat source. The possibility of the application of the method to the extremely low resistance cover is also discussed in this paper.%江苏省如东某沿海围垦区富含咸水，电阻率值极低，传统直流电法难以开展深部勘查工作。利用V8功率大、CSAMT法穿透力强的优点，通过加密频点等方法技术提高分辨率，结合已有地质、物探资料推测了低阻覆盖层下的控热储水构造，验证结果表明所推断裂构造是沟通深部热源的有利通道，验证了该方法应用于超低阻覆盖区的可能性。