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HCO_(3)-Na、HCO_(3)·SO_(4)-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1.67×10^(10)GJ,折合标煤5.72×10^(8)t,年可开采地热资源量可满足供暖面积2亿m^(2),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7.06×10^(7)GJ,折合标煤2.41×10^(6)t,可满足供暖面积0.85亿m^(2),具有良好的地热市场开发前景。
[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 HCO_(3)-Na,HCO_(3)·SO_(4)-Na to mature Cl-Na;the recoverable geothermal resources in this area is 1.67×10^(10)GJ,equivalent to 5.72×10^(8)t of standard coal.The annual exploitable geothermal resources can meet the heating area of 2×10^(8)m^(2),considering the balance of exploiting and irrigation,the annual exploitable resource of geothermal fluid in the northern part of Cangxian uplift is 7.06×10^(7)GJ,equivalent to 2.41×10^(6)t of standard coal,which can meet the heating area of 8.5×10^(7)m^(2),which has a good prospect of geothermal market development.
作者
王婷灏
汪新伟
毛翔
罗璐
高楠安
刘慧盈
吴陈冰洁
WANG Tinghao;WANG Xinwei;MAO Xiang;LUO Lu;GAO Nan'an;LIU Huiying;WU Chenbingjie(Sinopec Star Petroleum Corporation Limited,Beijing 100083,China;Key Laboratory of Geothermal Exploitation and Utilization,SINOPEC,Beijing 100083,China;China University of Geosciences(Beijing),School of Energy,Beijing 100083,China)
出处
《中国地质》
CAS
CSCD
北大核心
2022年第6期1747-1764,共18页
Geology in China
基金
中国石化集团重点科技项目“渤海湾盆地重点地区地热资源评价与开发技术政策”(JP19002)资助。
关键词
热储评价
地温场特征
地热资源潜力
沧县隆起北部
天津市
地热地质调查工程
reservoir evaluation
characteristics of geothermal field
geothermal resource potential
northern Cangxian uplift
Tianjin
geothermal geological survey engineering
作者简介
王婷灏,女,1990年生,工程师,矿产普查与勘探专业,主要从事地热资源评价研究,E-mail:wangtinghao.xxsy@sinopec.com。
