综合物探技术在大秦龙山地热勘查中的应用研究

Application of integrated geophysical exploration technology in geothermal exploration of Longshan Mountain in Daqin

大秦龙山旅游开发区位于甘肃省天水市甘泉镇,区内热储层岩性为秦岭岩群变质岩及下部花岗岩体等,在岩体裂隙较发育的地段,形成地热储集的空间,地下水经热储集区加热后,沿导水导热构造带循环运移至阻水断层处聚集形成地热异常区。文章结合水文地质条件,利用微重力、可控源音频大地电磁法(CSAMT)对该研究区地层岩性、地质构造及热储埋深进行勘查,基本查明了区内控热构造的空间展布特征。研究结果认为:结合勘查物探成果可合理布置探采结合钻孔,并通过抽水试验,最终获得井口水温为38.3°,出水量为326 m3/d的地下热水,达到了既定勘查效果,证明综合物探技术在地热勘查中的实际应用效果明显,可为钻孔布设提供科学依据。

DaqinLong mountain tourism development zone is located in Tianshui,Gansu provinceGanquan town,thermal reservoir lithology QinLing rock group metamorphic rocks and lower granite rock mass in the area of the development of rock fracture is the formation of geothermal reservoir space,groundwater after heat reservoir district heating,thermal tectonic belt cycle and water movement along the guide to block water gathered form geothermal anomaly area.Combining hydrogeological conditions,using the micro-gravity of controlled source audio-frequency ground electromagnetic method(CSAMT)on the formation lithology of geological structure in the study area and the thermal reservoir buried depth of exploration,find out the basic area of the research results of the spatial distribution characteristics of the internal control thermal structure that combined with exploration geophysical exploration results can reasonable decorate exploration in combination with drilling,and through the pumping test,finally get the mouth of the well water temperature is 38.3,the underground hot water of water yield of 326 m3/d,meeting its exploration results prove that integrated geophysical exploration technique in the actual application of geothermal exploration effect is obvious,can provide scientific basis for drilling layout.