摘要
通过岩心热物性测试、地热井生产数据分析,结合数值模拟技术对松南中央隆起带青山口组聚热机制、地热井温度恢复规律等方面开展研究,对比不同构造部位、不同埋深的地热储层及生产井的共性与差异,笔者总结了盆地型地热资源聚热机制及其对生产井的影响规律。结果表明:青山口组中部温度在45~165℃之间,凸起部位温度明显高于凹陷部位,温度最大相差达100℃;同时地热井开采模拟显示,持续开采30 a凸起部位较凹陷部位井的流体温度降低更为缓慢,降幅相差约7℃。综合地质结构、断裂系统、构造格局分析,认为凹凸相间的构造格局是松南中央隆起带青山口组储层主要聚热机制,并且在相似条件下,构造凸起部位在地热井开采过程中,温度降低幅度较构造凹陷部位缓慢,可持续开采的时间更久。
Through analysis of core thermal property and geothermal well production data,combining with numerical simulation technology,the heat accumulation mechanism of Qingshankou Formation in Songnan central uplift belt and the temperature recovery rule of geothermal wells were studied.After comparing the similarities and differences of geothermal reservoirs and production wells in different structural positions and burial depths,the authors summarized the heat accumulation mechanism of basin-type geothermal resources and its influence on production wells.The results show that the temperature in the middle part of Qingshankou Formation ranges from 45℃to 165℃,and the temperature in the uplift is obviously higher than that in the depression,with a maximum of 100℃.At the same time,the exploitation simulation shows that the fluid temperature of geothermal well in uplift decreases more slowly than that in the depression during 30 years of continuous exploitation with a decreasing amplitude of about 7℃.Based on the analysis of geological structure,fault system and tectonic pattern,it is concluded that the uplift and depression tectonic units are the main heat accumulation mechanism of Qingshankou Formation reservoir in Songnan central uplift belt.In addition,under similar conditions,the temperature decreasing rate of geothermal well exploitation in the structural uplift area is lower than that in the structural depression area,and the sustainable time of exploitation in the uplift is longer.
作者
徐小红
肖杭州
李迎九
贾雪峰
赵容生
XU Xiaohong;XIAO Hangzhou;LI Yingjiu;JIA Xuefeng;ZHAO Rongsheng(Exploration and Development Research Institute of PetroChina Jilin Oilfield Branch Co.,Ltd.,Songyuan 138000,Jilin,China;PetroChina Jilin Oilfield Branch Co.,Ltd.,Songyuan 138000,Jilin,China;College of Earth Sciences,Jilin University,Changchun 130061,China)
出处
《世界地质》
CAS
2024年第2期263-270,共8页
World Geology
基金
国家自然科学基金项目(42002153)。
关键词
聚热机制
地热资源开采
数值模拟
青山口组
松南中央隆起带
heat accumulation mechanism
geothermal resources exploitation
numerical simulation
Qing-shankou Formation
Songnan central uplift belt
