东营市南展区砂岩热储地热回灌量与温度的关系探讨

东营地区地热资源丰富,主要开采层位为新近纪馆陶组、古近纪东营组,热储类型为低温温热水、热水型层状孔隙-裂隙型砂岩热储,地下热水补给条件较差。近年来,随着地热资源的开发利用规模的加大,开采密集地带的热水头明显下降,存在资源枯竭,引发地质环境问题的威胁。采用回灌方式补充地下水源,是实现地热资源可持续利用和地质环境保护的有效措施。为研究该区地热回灌可行性与回灌制约因素,在南展区开展了多次回灌试验,试验表明,该层热储回灌空间大,回灌条件较好,压力对回灌效果影响明显,回灌水体温度对回灌效果影响较大。利用回灌量与回灌水头之间的影响关系,模拟计算不同温度下回灌水头的变化情况,探讨了回灌量与回灌水体温度的影响关系,对回灌研究具有一定的指导意义。

Study on the Relationship between Reinjection Volumeand Temperature of Sandstone Geothermal Reservoir in Nanzhan Area of Dongying City

There is rich geothermal resources in Dongying area, and the main mining layers are Neogene Guantao formation and Paleogene Dongying formation. Thermal reservoir are warm hot water type and layered pore fissure type sandstone reservoir. The geothermal water supply condition is poor. In recent years, accompanying with the increase of the scale of exploitation and utilization of geothermal resources, geothermal water head in the mining area has been decreased obviously, and there is a threat to resource depletion and geological environment. Reinjection is an effective way to realize the sustainable utilization of geothermal resources and the protection of geological environment. In order to study the feasibility of geothermal reinjection and controlling factors for reinjection in Dongying city, recharge tests have been carried out in Nanzhan area. It is showed that the reservoir has a large space and the recharge condition is good, pressure on the recharge effect is obvious, but the influence of temperature on the water recharge recharge effect can not be ignored. Based on the test process, by using the relation between recharge and recharge of water head, the changes under different temperatures have been simulated and calculated, the influence of the injection volume and injection water temperature has been studide. It will provide some references for recharge study in future.