基于Modflow软件的德州市城区馆陶组热储数值模拟研究

摘要

Shandong province is located in the northwest region, rich in geothermal resources, the city has 75 geothermal wells, geothermal resources development, put forward new requirements for the management of geothermal resources, this paper takes Dezhou city as the study area, to collect sufficient data, using Modflow software to establish the Dezhou City geothermal reservoir of Guantao formation model.Water distribution and urban buried geothermal field of reservoir of Guantao formation in the evaluation calculation, the reservoir of Guantao formation is generalized to plane and infinite top floor aquifuge homogeneous aquifer.The unsteady flow pumping test of hydro geological parameters obtained from the test is used to identify the model, with both eyes the long-term monitoring of water level dynamic observation data of holes and over the years, exploitation of geothermal resources of the model.The sandstone and reservoir interblended mudstone compaction released water is the main reservoir of geothermal water found in the process of correction One of the sources is to reduce the geothermal water level of 2m/a as the limiting condition, the allowable exploitation of geothermal water in the Guantao formation of area is 5 million 320 thousand.%德州市位于山东省西北部,区内地热资源丰富,城区已有地热井75眼,地热资源大量开发,对地热资源的管理提出了新的要求,本文以德州市城区为研究区,充分收集资料,采用Modflow软件建立德州市城区馆陶组热储模型,对馆陶组热储的埋藏分布规律及城区地热田的地热水储量进行计算评价,将馆陶组热储概化为平面上无限延伸且顶、底板为隔水层的均质含水层.采用非稳定流抽水试验求取的水文地质参数对模型进行识别,利用两眼长期监测孔的水位动态观测数据及历年来地热资源的开采情况对模型进行校正.校正过程中发现与热储砂岩互层分布的泥岩压密释水是热储地热水的主要来源之一.以地热水水位降幅2 m/a为限制条件,德城区馆陶组热储地热水的允许开采量为532万 m3/a.