开封坳陷中牟凹陷馆陶组砂岩热储地热系统成因模式及开发潜力  

Genetic Model and Development Potential of the Guantao Formation Sandstone Geothermal System in the Zhongmu Sag,Kaifeng Depression

作　　者：贺婷婷 杜利 谈心[3] 刘均荣[4] 罗璐 章惠 李昊[1,2] HE Tingting;DU Li;TAN Xin;LIU Junrong;LUO Lu;ZHANG Hui;LI Hao(Star Petroleum Corporation Limited,SINOPEC,Beijing 100083,China;Key Laboratory of Geothermal Resources Exploitation and Utilization,SINOPEC,Beijing 100083,China;International Petroleum Exploration and Production Corporation,SINOPEC,Beijing 100029,China;China University of Petroleum,Qingdao,Shandong 266580,China)

机构地区：[1]中国石化集团新星石油有限责任公司,北京100083 [2]中国石化地热资源开发利用重点实验室,北京100083 [3]中国石化集团国际石油勘探开发有限公司,北京100029 [4]中国石油大学(华东),山东青岛266580

出　　处：《现代地质》2024年第6期1557-1570,共14页Geoscience

基　　金：中国石油化工股份有限公司科技项目(JKL21003);国家自然科学基金项目(52174048);中国石油化工股份有限公司科技项目(JP22087)。

摘　　要：地热系统成因机制研究与地热资源量精细评价是实现区域地热高效开发的基础。本文选取开封坳陷中牟凹陷为研究对象,基于区域地质构造特征,结合地热井和水化学分析资料,对该凹陷地温场、热储展布规律及水化学特征等因素进行了剖析,构建了地热系统概念模型,并分层系精细评价地热资源量。结果表明,中牟凹陷地热系统的热源主要来自壳幔的热传导,大地热流值约45~65 mW/m^(2),其北部的焦作—新乡—商丘断裂为其深部热流向上传递的有利通道。热储为馆陶组砂岩,在区内分布较稳定,底板埋深在1600~2200 m,热储垂向上可识别出30~48层砂体,累计厚度介于130~420 m,孔隙度约16%~32%,砂地比最高可达67%。热储物性空间上具有凹陷东部优于西部、馆下段优于馆上段的特征。馆陶组地热井的井口水温68~85℃,单井水量10^(6)~155 m^(3)/h,水化学类型以Cl-Na为主,矿化度10000~30000 mg/L。厚约1200 m的上覆第四系和明化镇组地层构成区域的良好盖层。地热水的来源整体接受西部和西南部山区的大气降水补给,经深部热传导增温后,侧向补给给热储层。中牟凹陷馆陶组砂岩热储地热资源量约2245.41×10^(8)GJ,每年可开采地热资源量为5.61×10^(8)GJ,折合标煤1.92×10^(6)t。年开采地热资源量可满足约6770万m^(2)的供暖面积,开发潜力巨大。Research on the genetic mechanisms of geothermal systems and the detailed evaluation of geothermal resources are fundamental to understanding the efficiency of regional geothermal development.In this study,the Zhongmu Sag in Kaifeng Depression is chosen as a case study.Based on the regional geological structural characteristics,and combined with data from geothermal wells and hydrochemical analysis,factors such as the geothermal field,thermal reservoir distribution,and hydrochemical characteristics of the sag are analyzed.We also developed a conceptual model of the geothermal system and carefully evaluated the geothermal resources using a stratification approach.The results indicate that the heat source of the geothermal system in the Zhongmu Sag is primarily derived from heat conduction in the crust and mantle,with a heat flow value of approximately 45-65 mW/m^(2).The Jiaozuo-Xinxiang-Shangqiu fault in the northern Zhongmu Sag served as a favorable channel for the upward transport of deep heat flow.The thermal reservoir is the Guantao Formation sandstone,which is consistently distributed throughout the area.The depth of the reservoir floor ranges from approximately 1600 to 2200 m.Between 30 and 48 vertical sand layers can be identified within the thermal reservoir.They have a cumulative thickness of approximately 130-420 m,a porosity ranging from 16%to 32%,and a reservoir thickness ratio of up to 67%.The thermal reservoir of the Guantao Formation sandstone in this sag exhibits characteristics where the eastern part is superior to the western part,and the lower section of the Guantao Formation is superior to the upper section.The water temperature of the sandstone geothermal wells in the Guantao Formation ranges from approximately 68 to 85℃.The water volume for a single well is between 10^(6)and 155 m^(3)/h,and the hydrochemical solution is primarily Cl-Na,with a salinity of around 10000 to 30000 mg/L.The Upper Quaternary and Minghuazhen Formation have a combined thickness of approximately 1200 m and serve as a

关 键 词：地热系统 成因模式 资源量评价 砂岩热储 馆陶组 中牟凹陷 

分 类 号：P618.1[天文地球—矿床学]