天津市新近系馆陶组砂岩热储回灌能力评价分析  

Evaluation and analysis of heat reservoir reinjection ability of Neogene Guantao formation in Tianjin

作　　者：李珊 孙晓林 杨宝美 高新智[1] LI Shan;SUN Xiaolin;YANG Baomei;GAO Xinzhi(Tianjin geothermal exploration and Development Design Institute,Tianjin 300250,China)

机构地区：[1]天津地热勘查开发设计院,天津300250

出　　处：《华北地质》2023年第2期38-44,共7页North China Geology

基　　金：国家科技部重点研发计划:“砂岩储层水-热-化动态监测与模拟方法(2019YFB1504204)”。

摘　　要：天津市馆陶组地热资源开发利用主要集中在武清区和滨海新区,经过多年开发利用,馆陶组热储层水位持续下降。为了减缓地下水位下降趋势,近年来持续增大馆陶组热储回灌,但在实际回灌过程中,发现不同地区的回灌能力差别很大,根据已有数据表明,馆陶组热储层单位回灌量大小顺序依次为塘沽凹陷>板桥凹陷>大城凸起>武清凹陷。本文通过水岩试验数据分析得出,馆陶组热储层砂岩胶结度越大,越不利于储层的回灌,泥质含量直接影响砂岩3D孔隙度,进而影响热储层的回灌能力,依据测井试验得到的表观孔隙率来判断砂岩的渗透性是不准确的。通过对热储层水化学特征、下伏地层岩性、径流条件的研究,提高了馆陶组地热资源开发保护的认识。The development and utilization of geothermal resources in the Guantao Formation in Tianjin are mainly concentrated in Wuqing District and Binhai New Area.During many years of geothermal development and utilization,the groundwater level of the thermal reservoir in the Guantao Formation has continued to decline.In recent years,the reinjection of the thermal reservoir in the Guantao Formation has continued to increase,to slow down the downward trend of the groundwater level.However,in the actual reinjection process,it is found that the reinjection capacity of different regions is very different.According to the existing data,the order of unit recharge volume of the Guantao Formation thermal reservoir is Tanggu Depression,Banqiao Depression,Dacheng Uplift and Wuqing Depression.This article analyzes the data from water rock tests and concludes that the larger the cementation degree of sandstone in the Guantao Formation thermal reservoir,the more unfavorable it is for reservoir recharge.The shale content directly affects the 3D porosity of sandstone,which in turn affects the recharge capacity of the thermal reservoir.It is inaccurate to judge the permeability of sandstone based on the apparent porosity obtained from logging tests.By studying the hydrochemical characteristics of thermal reservoirs,underlying strata lithology and runoff conditions,we have improved our understanding of the development and protection of geothermal resources in the Guantao Formation.

关 键 词：馆陶组 沉积特征 水岩关系 地热回灌 回灌分区 

分 类 号：P314[天文地球—固体地球物理学]