周口坳陷西南部地热资源赋存特征及开发前景  

Occurrence Characteristics and Development Prospect of Geothermal Resources in the Southwest of Zhoukou Depression

作　　者：胡剑[1] 王道成[1] 徐凌[1] 刘蔷[1] 高阳 冷济高 潘良云 曹海丽 HU Jian;WANG Dao-cheng;XU Ling;LIU Qiang;GAO Yang;LENG Ji-gao;PAN Liang-yun;CAO Hai-li(Southwest Oil&Gas Field Company,PetroChina,Chengdu 610051,China;Beijing GEM Flower Energy Science&Technology Co.,Ltd.,Beijing 100061,China)

机构地区：[1]中国石油天然气股份有限公司西南油气田分公司,成都610051 [2]北京宝石花能源科技有限公司,北京100061

出　　处：《科学技术与工程》2025年第9期3545-3554,共10页Science Technology and Engineering

基　　金：中国石油天然气股份有限公司西南油气田分公司科技项目(XNS-JS2023-83)。

摘　　要：地热资源赋存特征及成因模式是地热资源开发的重要依据。基于区内各类钻孔、地球物理及地球化学资料,在明确储盖、温度特征基础上,对热源、通道、补给要素开展研究,建立周口坳陷西南部地热系统成因模式,进而评价其开发前景。研究区赋存低温沉积盆地型地热资源,幔源热是主要热源,南冷北热,凸起区大地热流高于凹陷区,可达70 mW/m^(2)以上。平均地温梯度为2.8℃/hm左右,为传导型传热,断裂的发育也促进了深部热流的上涌,局部存在热对流增温作用。同位素分析显示补给来自西部低山丘陵的大气降水,在裸露区下渗后沿渗透地层、不整合面向东部运移并被加热增温。新近系、古近系砂岩孔隙、寒武-奥陶系碳酸盐岩岩溶孔洞是流体主要赋存空间。第四系与新近系上部发育的粉砂、黏土沉积构成了良好的隔水隔热盖层。目前新近系开发利用风险最小,热储底板埋深400~1400 m,向北埋深增大,砂地比平均40.9%,水量40~60 m^(3)/h,井口水温43~48℃。最终落实4个孔隙型地热资源开发有利区,3个岩溶型地热资源开发有利区。The occurrence characteristics and genetic models of geothermal resources is an important basis for the development of geothermal resources.Drilling data,geophysical and geochemical data was applied to analyze the thermal reservoir,cap rock,heat sources,channels and supply elements,and the genetic model of geothermal system in the southwest of Zhoukou Depression was established.The development prospect was also evaluated.The geothermal resources in study area can be divided into sedimentation basin type with low temperature.Mantle derived heat is the main heat source,and the geothermal flow in the north part is higher than that in the south part,also in the protruding area is higher than that in the depressed area,reaching over 70 mW/m^(2).The average geothermal gradient is about 2.8℃/hm,dominated by heat conduction system.Isotope analysis shows that the supply source comes from atmospheric precipitation in the western low mountains and hills,which infiltrates through the exposed area and moves along permeable strata and unconformity towards the east,and is heated and warmed up.The pores of the Neogene and Paleogene sandstones,as well as the karst pores of the Cambrian-Ordovician carbonate rocks,are the main storage spaces for fluids.The silt and clay deposits developed in the upper part of the Quaternary and Neogene systems form a good waterproof and thermal insulation cover layer.The development and utilization risk of the Neogene system is the lowest,with a floor depth of 400~1400 m,increasing towards the north.The average sand to soil ratio is 40.9%,with a water flow between 40~60 m^(3)/h and a wellhead temperature of 43~48℃.The development of faults also promotes the upwelling of deep heat flow,and there is a local thermal convection warming effect.Finally,four favorable development area for porous geothermal resources and three favorable areas for karst resources were identified.

关 键 词：地热资源 赋存特征 成因模式 周口坳陷 驻马店市 

分 类 号：P314[天文地球—固体地球物理学]