四川宜宾金沙江河谷区地热资源成藏条件分析  

Analysis of Geothermal Resources Formation Conditions in the Jinsha River Valley of the Yibin Area,Sichuan Province

作　　者：闫秋实 高志友[1] 尹观[1] 

机构地区：[1]成都理工大学地球化学系,四川成都610059

出　　处：《地质与勘探》2012年第4期847-851,共5页Geology and Exploration

摘　　要：本文从地热地质背景、水文地质条件、构造条件、热储条件等几方面对金沙江宜宾段河谷区的地热成藏条件及开发潜力进行了较为深入的论述。研究表明:该区的古地理环境有利于地表水向深部补给、运移、往更纵深循环以及形成与深部热储充分进行热交换,有利于形成保持相对封闭的热水构造,使深部地热水处于承压状态;热储层盖层对地下热水具有良好的保温防热扩散作用,且阻隔浅层地表水向下运移;东西向断裂与南北向断裂或与NE、NW向断裂的多方向构造的交切复合部位为深部地热水向上运移排泄的极为有利构造部位;区内地下热水其热源主要是地热增温,大气降水经由深循环加热,与深部热储层岩石进行充分的热交换,温泉水以补给地高、运移途径长、循环深、滞留时间长为特征。Taking the Yibin section of the Jinsha River as an example,this paper studied its geothermal resources and potential from geological background,hydrogeology,tectonics and heat-storage conditions.It is indicated that the paleo-geographic environment is favorable for migration and cycling of underground thermal water as well as exchanging heat with the deep heat-storage reservoir.This helps to form relatively closed thermal structures,making the deep thermal water be in pressurized situation.The cap rocks can increase thermal insulation and control thermal diffusion,and prevent the surface water from migrating downward.And this region is located at the junction of several faults which provide conduits for the thermal water convection at depth.The water precipitated downwards from higher places in this area,passing over a long distance and to a big depth.Extensive thermal exchange with hot wall-rocks occurred when the water was resorted at depth for a long time.The geothermal resources in this area have a big economic potential.

关 键 词：叠合盆地 地热资源 成藏条件 热储温度 

分 类 号：P345[天文地球—水文科学]