The 3D geothermal geological modeling can intuitively reflect the temperature field distribution pattern of the geological bodies,which is helpful to determine the favorable target area of geothermal resources.In this paper,geophysical and drillhole data and rock thermal properties data were used to carry out 3D geological modeling and temperature field simulation of the central depression area of Songliao Basin,and verified the reliability of the geothermal geological model through drillhole temperature measurement and measured heat flow data.The results showed that the temperature of the central depression at a depth of 1.0～4.0 km was 30.3 ℃～62.8 ℃,68.2 ℃～120.2 ℃,110.5 ℃～166.7 ℃ and 158.4 ℃～214.2 ℃,respectively.The 4.0 km depth inland geothermal gradient is between 36.9 ℃/km～57.4 ℃/km,and the average geothermal gradient is 48.4 ℃/km.The temperature of four main thermal reservoir bottom plates of Nenjiang Formation,Yaojia Formation 2-3,Qingshankou Formation 2-3,and Quan Formation 3-4 are 15.8 ℃～71.4 ℃,23.6 ℃～88.6 ℃,31.8 ℃～107.4 ℃,and 48.9 ℃～133.4 ℃,respectively.Huazijing terrace,Daqing placanticline,and Binxian Wangfu Sag are high value areas of thermal reservoir temperature.The current geothermal field in the research area is mainly controlled by the fluctuation of the basement.The"refraction"effect of heat flow caused by the difference of thermal conductivity(between basement and sedimentary layer)promotes the redistribution of heat flow in the shallow part and the heat flow distribution pattern between concave and convex is formed.In addition,fault structures also have a significant impact on the distribution of high anomaly areas in the geothermal field.Combined with the characteristics of heat source,channel and reservoir cap combination,the Quantou Formation 3-4 in the central area of Daqing placanticline are determined as favorable targets for geothermal resources development in the central depression of Songliao Basin.
关键词
三维地热地质建模/地热资源靶区/热储温度/松辽盆地中央坳陷
Key words
3D geothermal geological model/Geothermal resource target area/Reservoir temperature/Central depression of Songliao Basin
维普
万方数据