Characteristics and development potential of geothermal resources in northern Cangxian uplift
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摘要:
研究目的 地热资源特征研究及开发潜力分析是开发区域地热资源的重要依据。
研究方法 本文将前人研究成果与最新钻井资料相结合，通过对沧县隆起北部地区地热地质背景、热储分布、地温场特征、水化学资源类型等主要因素进行剖析，建立了该区的地热成藏模式。
研究结果 沧县隆起北部地区是在渤海湾伸展型沉积盆地高大地热流值背景下，由北部燕山裸露区基岩接受的大气降水作为近源补给水源，进入基岩的冷水在深层循环过程中受到深部热源加热增温，沿断裂破碎带和不整合面向上运移富集，形成的以传导型传热机制为主的地热系统。
结论 本区地热资源特点为热储类型多、盖层地温梯度高、补给速度快、资源量巨大。主要表现为：区内分布馆陶组砂岩热储，奥陶系、蓟县系雾迷山组岩溶热储三套主力热水储集层；地温场分布主要受基底构造形态控制，基岩凸起区的平均地温梯度为45℃/km；地下水类型随着埋深的增加由HCO3-Na、HCO3·SO4-Na型水向成熟的Cl-Na型水过渡；本区内三套热储的可采地热资源量为1.67×1010GJ，折合标煤5.72×108t，年可开采地热资源量可满足供暖面积2亿m2，若在采灌平衡的条件下，沧县隆起北部地区年可采地热资源量为7.06×107GJ，折合标煤2.41×106t，可满足供暖面积0.85亿m2，具有良好的地热市场开发前景。
Abstract:This paper is the result of geothermal geological survey engineering.
Objective The characteristics and development potential of geothermal resources is an important basis for the development of regional geothermal resources.
Methods Combined the previous research results with the latest drilling data, the geothermal reservoir model is established based on the analysis of the main factors such as geothermal geological background, thermal reservoir distribution, geothermal field characteristics and hydrochemical resource types in the northern Cangxian uplift.
Results Under the background of high heat flow value in the extensional sedimentary basin of Bohai Bay, the atmospheric precipitation received by the bedrock in the exposed area of Yanshan Mountain in the north is used as the near source water supply. The cold water enters the bedrock, is heated by the deep heat source in the deep circulation process, and migrates and enriches along the fracture zone and unconformity surface, and forms the geothermal heat transfer mechanism dominated by conduction system.
Conclusions The geothermal resources in this area are characterized by many types thermal reservoirs, high geothermal gradient of caprock, rapid recharge rate and huge resources. It is mainly shown as follows: Three sets of main hot water reservoir, sandstone thermal reservoir of Guantao Formation, karst thermal reservoir of Ordovician and Jixian Wumishan Formation are distributed in the area; the distribution of geothermal field is mainly controlled by basement structure, and the average geothermal gradient in bedrock uplift area is 45 ℃/km; with the increase of groundwater depth, the groundwater type changes from HCO3-Na, HCO3·SO4-Na to mature Cl-Na; the recoverable geothermal resources in this area is 1.67×1010 GJ, equivalent to 5.72×108t of standard coal. The annual exploitable geothermal resources can meet the heating area of 2×108 m2, considering the balance of exploiting and irrigation, the annual exploitable resource of geothermal fluid in the northern part of Cangxian uplift is 7.06×107 GJ, equivalent to 2.41×106t of standard coal, which can meet the heating area of 8.5×107 m2, which has a good prospect of geothermal market development.
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表 2 沧县隆起北部地区地热井数据统计表
Table 2. Statistical table of geothermal well data in northern Cangxian uplift
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表 3 研究区地下水水化学测试结果(mg/L)
Table 3. Chemical compositions of groundwater from the study area(mg/L)
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表 4 沧县隆起北部地区地热资源评价参数与计算结果汇总表
Table 4. Summary of evaluation parameters and calculation results of geothermal resources in Cangxian uplift
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