摘要
我国不少含油气沉积盆地同时也赋存着大量的地热资源,探讨地热田不同开发情景下热储温压场的变化,对于确定地热资源的合理开发策略至关重要。为此,以渤海湾盆地济阳坳陷东营凹陷东营城区地热田为例,综合各类地质、钻探和岩心资料,系统分析了该区储盖组合、地层热导率、温压场等地热地质特征,进而采用以Tough2为核心的Petrasim软件建立了地热田成因概念模型,研究了开采、回灌条件下热储的温压场响应,确定了采灌量等井网布局参数的限制条件,最后提出了地热资源开发优化策略。研究结果表明:①该区地热田最大开采量为63 m3/h,回灌量为32 m^3/h;②要实现100%回灌,需采取“一采两灌”的布井方式,最优采灌井距为400 m。结论认为:①合理的地热田概念模型是进行数值模拟的前提,油气田在长期的勘探过程中积累了丰富的地质、地温和岩心测试数据资料,为正确认识油气区的地热资源分布和热储特征提供了数据支撑;②水热耦合数值模拟是地热田管理的有效手段,能够确定开采量、回灌量、采灌比、采灌井距等布井关键参数,有利于优化地热开发模式,进而实现地热资源的可持续开发。
Huge geothermal resources have been discovered in those giant hydrocarbon sedimentary basins in China.To investigate how temperature and pressure field change in the thermal reservoirs under different development scenarios is essential to the determination of reasonable geothermal resource exploitation strategies.In view of this,the Dongying geothermal field in the Jiyang Sag,Bohai Bay Basin,was taken as an example.In combination with the available geological,drilling and core data,such characteristics were discussed as storage–caprock assemblage,strata heat conductivity,temperature–pressure field,etc.Then,Petrasim was adopted with Tough2 as the core to establish a conceptual model of genesis of geothermal fields.With this model,temperature and pressure field response of thermal reservoirs under exploitation and re-injection conditions was discussed and the restriction conditions of well pattern layout parameters such as production and re-injection amount were determined,and optimal strategies were put forward on geothermal resource development.It is found that the maximum production rate is 63 m3/h while the re-injection rate is 32 m^3/h,so the ratio between production and re-injection wells should be 1:2.The optimal distance between a production well and a re-injection well is about 400 m.It is concluded that a reasonable geothermal field conceptual model is the premise of numerical modeling and the available numerous geological,geotemperature and core data provide robust support for a better understanding of geothermal resource distribution and geothermal reservoir characteristics;and that hydrothermal coupling numerical simulation is a powerful means for geothermal field management,and it can determine key parameters of well spacing such as production rate,reinjection rate,ratio between production wells and reinjection wells and inter-well space,which is conducive to optimizing geothermal development mode and realizing a sustainable geothermal resources development.
作者
段忠丰
李福来
巩亮
杨永红
李晓燕
DUAN Zhongfeng;LI Fulai;GONG Liang;YANG Yonghong;LI Xiaoyan(Key Laboratory of Deep Oil and Gas,China University of Petroleum-East China,Qingdao,Shandong 266580,China;College of New Energy,China University of Petroleum-East China,Qingdao,Shandong 266580,China;Exploration and Development Research Institute,Sinopec Shengli Oil Field Company,Qingdao,Shandong 266580,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2020年第10期156-162,共7页
Natural Gas Industry
基金
国家自然科学基金重点项目“增强型地热系统热—流—力—化四场耦合热质传输机理研究”(编号:51936001)、中央高校基本科研业务费专项资金“新能源发展专项”(编号:19CX05002A)。
关键词
渤海湾盆地
东营凹陷
地热田
井网布局
水热耦合模拟
可持续开发
采灌井距
地热地质模型
Bohai Bay Basin
Dongying sag
Geothermal field
Well pattern layout
Hydrothermal coupled modeling
Sustainable development
Inter-well space
Geo-thermal geological model
