一种“三元耦合”的地热资源质量评价方法

A “Three Parameters Coupled” Method for Quality Evaluation of Geothermal Resources

摘要: 本文提出了地热资源质量评价方法，以综合反映某区域地热资源的开发价值和利用难度。研究中选取单井产热功率、地热流体质量和大地热流三个评价指标，建立了一种“三元耦合”的地热资源质量评价方法。单井产热功率用来反映储层物性特征和地热水补给能力，另外在建立分级标准时考虑了资源利用方式的投资回报，能够反映地热工程的经济价值，是本方法的主要评价指标。地热流体质量体现在结垢性和腐蚀性，会对地热井管和换热设备产生损耗，从而影响地热资源开发的经济性。大地热流体现热储层的热补给能力。首先对三个评价指标进行单指标评价，然后利用综合评价模板就可以得到区域地热资源质量的综合分级。本方法既简单明了，又能反映地热资源的内在属性，经过济阳坳陷6个地热项目的实际应用和检验，该方法评价结果能够客观地反映地热资源特征，符合实际。

Abstract: This paper presented a new method for geothermal resources quality evaluation to show the ex-ploration value and difficulty of geothermal field. Three evaluation indexes, including thermal production rate, geothermal fluid quality and terrestrial heat flow were selected to establish the “three parameters coupled” geothermal resource quality evaluation method. Thermal production rate was the main evaluation index, which could not only reflect the reservoir characteristics and geothermal water recharge capacity, but also the economic efficiency since the investment return has been taken into consideration when the rating standard established. The quality of geothermal fluid would embody in scaling and erosion, which would cause the damage of geothermal well pipe and heat exchange equipment, thus affecting the economy of geothermal resource exploration. The terrestrial heat flow showed the heat supply capacity of the thermal reservoir. Three evaluation indexes were assessed separately first, and then the comprehensive rate of regional geothermal resource quality can be obtained by using an evaluation template. This method was simple and clear, and can reflect the inherent property of geothermal resources. Tested by six projects in Jiyang Depression, this method could objectively reflect the characteristics of geothermal resources.