综合物探在中深层地热勘查的应用研究

Research on the application of comprehensive geophysical prospecting in middle-deep geothermal exploration

重力异常是地层不同规模、形态以及埋深的非均匀地质体的综合响应,通过分析重力异常信息,可以探测区域地质构造、隐伏构造以及地层分布规律.在阐明区域地质概况及物性特征的基础上,针对城市特殊的场地环境及干扰因素,提出了以重力勘探法为主,地震方法为辅助手段的综合物探组合模式,并且研究了综合物探的可行性和互补性,通过实验数据和实际数据对比分析,可以很好的识别地质体边界和断层,推断断裂分布规律,确定具有控热构造的储层位置.本文通过研究综合物探方法在地热勘查中的应用,给出钻井建议,从而解决了地质结构不清、目标不明、钻探风险很大等地质问题.通过地热井验证表明,水温水量达标,地热供暖效果良好,充分发挥了地球物理方法在中深层地热勘查中的作用.

Gravity anomaly is the comprehensive response of heterogeneous geological bodies with different scales,shapes and buried depths.By analyzing the information of gravity anomalies,it is possible to detect regional geological structures,concealed structures,and stratum distribution laws.On the basis of clarifying the regional geological situation and physical characteristics,in view of the special site environment and interference factors of the city,a comprehensive geophysical prospecting combination model with gravity exploration method as the main method and seismic method as auxiliary means is proposed,and the feasibility of comprehensive geophysical prospecting is studied.And complementarity,through the comparative analysis of experimental data and actual data,geological body boundaries and faults can be well identified,fault distribution rules can be inferred,and the location of reservoirs with thermal control structures can be determined.This paper studies the application of comprehensive geophysical prospecting methods in geothermal exploration and gives suggestions for drilling,so as to solve the geological problems of unclear geological structure,unclear targets,and high drilling risks.Verification by geothermal wells shows that the water temperature and quantity of water meet the standard,and the geothermal heating effect is good,giving full play to the role of geophysical methods in the mid-deep geothermal exploration.