【作者】 李元杰；

【导师】 王贵玲；

【作者基本信息】 中国地质科学院 ， 地质工程， 2010， 硕士

【摘要】 在能源与环境形势日趋严峻的今天,清洁的地热资源无疑具有广阔的应用前景。然而,由于开采的严重无序化,造成热储压力和温度降低、资源枯竭等问题,影响了地热资源的永续利用。国内外实践证明,地热回灌是解决问题的首要途径。因此,通过地热回灌试验与数值模拟技术,研究温度场演化与热响应机制,探索热突破时间与地热地质环境的关系,对保护地热资源、确保地热资源的可持续利用、延长地热田的开发利用寿命具有重大的理论和现实意义。北京城区热田,地处华北平原北部,属于断陷盆地中低温传导型地热系统。本文以北京城区热田122号-123号深层地下热水井为研究对象,在总结北京城区热田的热储分布特征、地热地质、水文地质资料和研究成果的基础上开展模拟试验研究取得如下认识和成果：二元回灌示踪试验成功取得高质量成果数据,参数求解准确度较高。接收点信号捕获分辨率高,无背景干扰,铝元素浓度峰值曲线线形清晰,可以明确断定示踪剂突破时间68.66h,计算得渗流速度为3.35 m/h。结合抽水试验资料,利用抽水试验三次降深数据构造高斯——塞德尔迭代方程组,编制计算程序求解渗透系数K,反向代入示踪试验实测数据,获取重要参数——高渗性含水层厚度4.81m,由此求算得研究区域热储岩石裂隙率。充分利用示踪试验计算参数服务于热储温度场模拟研究,对采暖中期和末期热储温度场进行模拟分析,发现采暖前期至中期,冷锋面推移始终受阻,与大地热流增温加热和周围热水环境影响有关,后期井间热储资源大量循环开采,冷锋面逐渐向抽水井方向推进,冷热锋面对峙于中轴附近,地温梯度值大,温度等值线分布密集。纵观整个过程,并没有发生热突破现象,但趋势性变化仍为下一步研究指明了方向。左家庄观测站不同时间尺度范围内水位、水温变化数据表明,热水资源量的补给与自然降水过程密切相关,长期开采地热资源,热储温度显示波动变化,无明显下降趋势。研究区122号——123号地热对系统采用热储法对地下热储资源进行评价,整合计算得可采热水资源量为8.8×106m3,地热资源量为2.73×1010KJ,折合933吨标准煤热量。鉴于系统热储影响范围远远大于计算范围,可采热储量完全满足供暖需求。单纯从热能角度出发在保证热水资源量供给前提下,热储所蕴藏的地热能量再生性强,可长期开采利用。更多还原

【Abstract】 In the increasingly serious energy and environmental situation of today, no doubt that the clean geothermal resources have broad application prospects. However, because the mining is seriousiy disorder, reservoir pressure and temperature come down and resource depletion affecting the sustainable use of geothermal resources. Proved at home and abroad, geothermal water reinjection is the primary way to solve the problem. Therefore, through the geothermal reinjection experiment and simulation, study the effects heat recharge thermal response mechanism to explore the relationship between thermal breakthrough time and and geothermal geological environment.There will be significant for protection of geothermal resources, sustainable use of geothermal resources and geothermal field to extend the life of the development and utilization.Geothermal fields in Beijing urban area located in the North China plain. It is classified as rift basin medium-low conduction geothermal system. Taking 122#-123# geothermal double-wells as the research object, Summary Beijing City geothermal field distribution of the thermal storage, geothermal geological, hydrogeological data and other research results.Through reinjection tracer test and numerical simulation techniques, study on the evolution of geothermal reservoir simulation of temperature field.Understanding and results achieved as follows:From dual tracer test, the results showed that the signal receivers to capture high resolution, no background interference.We could see clear linear concentration curve peak of MO.Tracer breakthrough time can be clearly concluded that 68.66h, calculated flow rate of 3.35 m/h. Combination of pumping test data, the data structure used three descending deep Gauss-Seidel iterative equations.Then computer program solving the permeability coefficient K, reverse generation of measured data into the tracer test,getting the permeability of the aquifer thickness is 4.81m.Full use of tracer test calculation parameters serving temperature field simulation from medium-term to the final phase.The cold front is blocked from prophase to medium-term. In the final phase, mass exploitation of thermal energy storage resources made the cold front gradually advance to the pumping direction and located near the central axis, which is affected by heat flow heating and environmental temperature.Then the geothermal gradient value increases and the temperature contours intensive. Throughout the entire process there is no heat breakthrough phenomenon, but the trend of change still point out the direction of further research.Geothermal water level and temperature data processing as different time scales showed that thermal water supply quantity is closely related with the natural process of precipitation. Long-term exploitation of geothermal resources, thermal reservoir temperature display fluctuation with no significant downward trend.Geothermal double-well system(122#-123#) using underground thermal energy storage calculation method to evaluate resources.Through Integration calculating,the recoverable amount of hot water is 8.8×106m3 and geothermal resources is 2.73×1010KJ, equivalent to 933 tons of standard coal heat. In view of the fact that the system scope is much larger than thermal energy storage of calculating, recoverable reserves could satisfy heating demand for hot. If providing enough hot water, thermal reservoir energy storage will renew quickly and can be long-term exploited.更多还原