物探技术在河北西部山区深部地热勘查定井中的应用效果

河北省西部山区山间盆地型地热热储主要受构造控制。在勘查过程中,采用电阻率法和激发极化法等综合物探方法,对勘查区进行地质分层、构造圈定以及判断断裂构造的富水性等地质特征;依据土壤氡气、米地温测量等方法,判断深部构造的活动性。在确定热储构造平面位置后,根据可控源音频大地电磁测深数据资料,推断热储构造深部空间形态,判断产状。勘查过程中通过多方法、多参数的紧密结合,互为补充,互相验证,可为地热资源勘查和地热勘探井位的布置提供科学依据。

Application of comprehensive geophysical prospecting technologies for deep geothermal exploration in the western mountainous areas,Hebei Province

The geothermal reservoir of intermontane basin type in the western mountainous areas of Hebei province is mainly controlled by structure.In the investigation,comprehensive geophysical prospecting method such as Resistivity and Induced Polarization are used to analyze the geological characteristics of geological stratification, delineate structures and water abundance of fault in the exploration area.The activity of deep structure can be judged according to the methods of soil radon and shallow temperature survey.According to the data of Controlled Source Audio Frequency Magnetotelluric Method(CSAMT),the spatial form and occurrence of the geothermal reservoir can be inferred after determining the plane position of the geothermal reservoir structure.Multiple parameters which tightly combined and complement each other during the exploration process can provide a scientific basis for geothermal exploration and well placement.