Research On The Favorable Area Optimization Of Hot Dry Rock Resources In The East Of Yishu Fault Zone

China is a developing country with great energy demand,but the traditional fossil energy shortage,and the hydrothermal type of geothermal energy has the weakness of regional limitations,so the hot dry rock,as the backing of geothermal resources,has been gradually paid attention to.In order to make up for the shortage of hot dry rock investigation in the Yishu fault zone and its east area,In this paper,taking advantage of the hot dry rock resources in the east of Yishu Fault Zone as the research object,combined with geological conditions,hydrogeological conditions,geothermal geological conditions and other geological data in the study area,field investigation and sampling are carried out in the field,and the relevant indexes affecting the evaluation of hot dry rock favorable areas are analyzed.The evaluation index system of dry hot rock resources is established.This article gets the following main knowledge and conclusions:(1)This paper has collected a large number of basic geological data in the study area,and summed up the regional geological conditions,hydrogeological conditions and geothermal conditions,especially on the geological conditions related to the hot dry rocks,such as the formation,structure,the distribution of intrusive rocks of the magmatic rock and so on.(2)On the basis of the available data in the study area,the evaluation index system of the hot dry rock in the study area is established,including the characteristics of the heavy magnetic field,the feature of the geothermal field,the characteristics of the geological structure and the stability of the earth's crust,the characteristics of the thermal reservoir,the 5 index layers of the remote sensing image and the 14 index elements.Analyzing each evaluation index,At last,the analytic hierarchy process(AHP)and Mapgis spatial analysis function were used to evaluate the evaluation indexes in the evaluation index system,and the evaluation map of the favorable area for the hot dry rock resources in the study area was obtained.(3)The comprehensive evaluation score of hot dry rock resources in the study area is 3?8 points.According to the comprehensive score,the favorable areas are divided into five grades:the suitable area is mainly distributed in the southern part of the study area in Juxian-Linyi Yishui-Tancheng,with an area of 233.84km2,accounting for about 4.67%.The suitable area is mainly distributed in the area of Jiaolai Basin in the middle of the study area,with an area of 7103.09km2,about 14.18%.The suitable area is mainly distributed in Rongcheng,Weihai,with an area of 17402.44 km2,accounting for about 34.74%.The less suitable areas are mainly distributed in the northern part of Yantai,Qingdao Jimo and Weihai Rushan.The area is 11816.32 km2,accounting for about 23.59%;the other areas are not suitable for 11358.37 km2,accounting for 22.82%.(4)The results show that the area east of Yishu Fault Zone has a great potential of hot dry rock.Most suitable areas are distributed in the tectonic depression.The favorable areas are generally distributed in the southeast coastal and middle Jiaolai basins,which have the same direction as the coastline,the depth of the Moho surface and Curie isotherm surface is shallow and the geothermal gradient is high.