Recharge Condition Of Geothermal Water And Assessment Of Its Exploitation Potential

Now, geothermal resources are being exploited and utilized increasingly because of its cleanness, low-cost and act. Jinganpu Block of Shencai geothermal field in Liaohe Oil Field, is located in Damintun depression of Liaohe Basin.The distribution of Jinganpu Block is controlled by fault structure and buried hill tectonic belt. Jinganpu Block is relatively favorable traps, which is segmented by first order fault and many secondary faults in three sides. The development of faults provides better channels for the movement of groundwater. It accumulates abundant datum, through different investigation scales of geology, petroleum geology and hydrogeology.The Es32 of Shahejie formation in research area is the target layer of this paper, and its buried depth is from 1300m to 2300m. The 3D geothermal and geological conceptual model has been built based on the geological data, hydrogeologic data and temperature data of oilfield in the study area. The assessment of thermal reserve utilizes the methods of average and grid. The thermal reserve is calculated exactly by the method of grid which utilizes the software of FdmGrid. The total geothermal reserve is 12158.88×1011KJ, and the recoverable resources is 3039.72×1011KJ. The inverse calculation of hydrogeology parameters is based on well flow experiment data. The transmissivity coefficient T is 128.17m²/d, and the water storage coefficient S is 1.0×10^-6, and the well losses coefficient C is 2.0×10^-6. The leaky factor B is 1.12×104m, obtained by establishing groundwater flow numerical model of research area.The reasonable exploitation scheme is determined by the datum of petroleum geology and hydrogeology of Shencai geothermal field in Liaohe Oil Field, environmental impact, economic benefit, and so on. And, the geothermal water exploitation potentiality evaluating and recovery rate determination is based on this exploitation scheme. According to the criteria"The Methods of Evaluating on Geothermal Resources", the production life is 100 years.The total heat storage of exploitated geothermal water is 389.57×1011KJ(equivalent to 132.45×104tons), and recovery rate is 3.2%. According to the geothermal water exploitation potentiality evaluating, the relationship curve between the total volume of exploitated geothermal water and recovery rate is obtained.