Application Of Comprehensive Geophysical Prospecting In The Exploration Of Geothermal Resources

In the central and southern area of Hainan shallow bedrock, rock depth less than 50m, types of groundwater in shallow phreatic water and bedrock fissure water, the former is controlled by seasonal effects significantly, dry in the dry season, while the latter was controlled in bedrock faults belt. In the general direction of the North East and East, the East and west of the structural belt of the East and West are deep, which is the thermal structural belt, and the North West to the north and the south to the fault structure zone is a new fault, When the North East to something or to fault belt and the North West to the north and south, or to fracture intersection, in the intersection parts tend to form geothermal water rising channel, surface appear bedrock structure fissure vein hot springs. Water storage of the bedrock fracture behavior is vertical to the low resistivity anomaly, geothermal water rising channel showed abnormal high temperature, so conventional geophysical exploration methods in the central and southern regions of Hainan get widely used, and achieved good results.In early geothermal exploration and exploitation, take the single geophysical method for detection and drilling, the blindness, coupled with geophysical exploration with multiple resolution, single geophysical methods can not achieve to the accurate interpretation of anomaly, unable to determine the heat storage characteristics of faulted structure belt, also cannot fence geothermal field points distribution range, according to the geophysical data layout geothermal wells on the basis of mining is still not sufficient, the geothermal well into well rate is low, resulting in great economic waste, and delay period.This paper lists several geothermal field in geophysical exploration and application examples, demonstrate the use of shallow geothermal test results, effective fence geothermal channel distribution range; By using the high density resistivity measured section, with more intuitive and deep distribution in the cross section extends reflect bedrock fault; Determination of the strike distribution of the fault zone by the low resistivity anomaly of the apparent resistivity plane; Integrated geothermal anomaly, the fault zone distribution of electrical interpretation, effective division of thermal and thermal fault zone in the field area, and the deep well verification by geothermal exploration, the exploitation of large water, high water temperature of the hot mineral water.After several geothermal field in geophysical exploration test, summed up the Hainan area the bedrock structure vein fissure water prospecting, the best combination method, the standard provisions of shallow layer ground temperature measurement technology, similar to the future site geothermal exploration with guidance and reference significance.