沧县隆起中段献县凸起和阜城凹陷岩溶型地热资源特征

为探究华北平原的岩溶热储分布规律,以及如何高效开发利用献县凸起和阜城凹陷地热田的地热资源,结合前人研究成果与已有地热井的测井、地震、水化学等资料,分析了岩溶热储分布规律以及献县凸起和阜城凹陷地热田的四大要素即“源、储、通、盖”等地热地质条件,建立了地热田概念模型,并精细评价了地热资源量。研究表明地热田是形成于渤海湾盆地新生代伸展断陷背景下的受深大断裂控制的传导型地热田,主要以大气降水为补给水源,深大断裂和岩溶不整合面为水运移通道。来自太行山和燕山的水再补给、汇聚,在献县凸起及阜城凹陷岩溶热储中富集,形成中-低温传导型地热系统,具有良好的盖层以及高达3.63~5.31℃/100m的地温梯度。蓟县系岩溶热储顶板埋深1400~1500 m,有效厚度累计336.1 m;奥陶系岩溶热储顶板埋深2000~2500 m,有效厚度累计55.3 m。献县凸起地热田蓟县系岩溶热储可采资源量3.75×10^(9)GJ,折合标煤1.28×10^(8)t,年开采地热资源量可满足供暖面积4523×10^(4)m^(2);阜城凹陷奥陶系岩溶储可采资源量0.80×10^(9)GJ,折合标煤0.27×10^(8)t,年开采地热资源量可满足供暖面积954×10^(4)m^(2)。献县凸起及阜城凹陷地热田开发潜力巨大。

GEOTHERMAL RESOURCES ASSESSMENT AND NUMERICAL SIMULATION IN TUANBO REGION

This paper mainly deals with the reservoir on the heat and mass transfer and mass and energy balance in a geothermal field.On the basis of briefing the general characteristics of the reservoir and the supposition of the reservoir modeling,the paper emphasizes the mathematical descriptions of hydra thermal transportation and convection by two methods according to the different models,such as lumped parameter model and distributed parameter model.It is effective to use these models in simulating the heterogeneous,and anisotropical fracture reservoir for the designed lifetime of 15 years.