岩溶热储古岩溶发育机制与地热水富集模式  

Mechanism and model of paleokarst development in karst geothermal reservoirs

作　　者：康凤新 隋海波 李常锁 魏善明 江露露 崔洋 KANG Fengxin;SUI Haibo;LI Changsuo;WEI Shanming;JIANG Lulu;CUI Yang(College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China;801 Institute of Hydrogeology and Engineering Geology,Shandong Provincial Bureau of Geology&Mineral Resources,Jinan 250014,China;Shandong Engineering Research Center for Environmental Protection and Remediation on Groundwater,Jinan 250014,China;Shandong Engineering Technology Research Center for Geothermal Clean Energy Exploitation and Reinjection,Dezhou 253072,China;School of Water Conservancy and Environment,University of Jinan,Jinan 250022,China)

机构地区：[1]山东科技大学地球科学与工程学院,山东青岛266590 [2]山东省地质矿产勘查开发局八〇一水文地质工程地质大队,山东济南250014 [3]山东省地下水环境保护与修复工程技术研究中心,山东济南250014 [4]山东省地热清洁能源探测开发与回灌工程技术研究中心,山东德州253072 [5]济南大学水利与环境学院,山东济南250022

出　　处：《中国石油大学学报（自然科学版）》2024年第1期13-24,共12页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(42072331,U1906209);山东省泰山学者工程专项(tstp20230626);山东省地矿局地质勘查与科技创新项目(HJ202109)。

摘　　要：明晰岩溶储层古岩溶发育机制、形成演化及发育特征对揭示地热资源赋存特征与富集规律具有重要意义。以济南北地热田为例,在厘清奥陶纪马家沟群地层层序及沉积相特征基础上,通过地表岩溶、钻孔揭露地下岩溶发育特征及富水性分布规律的分析,研究岩溶热储古岩溶作用类型及发育机制,重塑济南北地热田岩溶发育与演化过程并阐明强岩溶发育与地热水富集模式。结果表明:同生岩溶、古风化壳岩溶、埋藏岩溶等三级岩溶发育过程驱动控制区域岩溶的分布层位及发育程度,构造岩溶驱动控制裂隙岩溶发育强度,重力势能驱动控制地热水循环深度和岩溶发育深度;奥陶系顶板以下320 m深度范围内,层间岩溶与构造岩溶复合处、层间岩溶与侵入岩体接触带是强岩溶发育带和地热水富集带。Understanding the mechanisms underlying ancient karst development,the evolution of formations,and characteristics of karst reservoirs holds immense significance in unveiling the occurrence patterns and enrichment principles of geothermal resources.Using the northern Jinan geothermal field as a case study,the research focuses on elucidating the sequence stratigraphy and sedimentary facies characteristics of the Ordovician Majiagou Group carbonate rocks.It formulates the paleo-karstification types and the mechanisms governing karst geothermal reservoirs by analyzing the spatial development characteristics of surface and underground karstification,revealed through bore holes,and the distribution of the water-rich areas uncovered by geothermal wells.The evolution of karst in the northern Jinan geothermal field follows a specific process:The three-stage karst development involving contemporaneous karst,paleo-weathering crust karst,and buried karst influences layer distribution and regional karst development,particularly interlayered karst.The intensity of karst development is governed by structural karst.The depth of eothermal water circulation and karst development is influenced by gravitational potential.Furthermore,the model depicting strong karst development and geothermal water enrichment in the northern Jinan geothermal field is as follows:Within a depth range of 320 meters below the Ordovician roof,the strongly developed karstification zone and the geothermal water enrichment zone occur either within the compound zone consisting of interlayered karst and structural karst,or at the contact zone between the interlayered karst and intrusive rock masses.

关 键 词：奥陶纪马家沟群 岩溶热储 古风化壳 层间岩溶 构造岩溶 演化过程 

分 类 号：TE121[石油与天然气工程—油气勘探]