热流测量中垂向地下水运动干扰的校正方法

CORRECTION FOR DISTURBANCE OF VERTICAL GROUNDWATER MOVEMENT TO HEAT FLOW MEASUREMENT

本文提出了一种地表热流测量中垂向地下水干扰的校正方法．并以江西萍乡和福建安溪的二个钻孔为例，说明了热流校正的具体过程．由于地下水对流传热的影响，垂向地下水渗透层内温度和热流随深度均呈指数分布．通过对钻孔测温数据的一维垂向Ｐｅｃｌｅｔ数分析，可以确定渗透层内传导和对流热流分量以及热流的构成，从而得到未受地下水对流干扰的区域背景热流．这一方法不仅适用于渗透率结构均一的介质，也可用于水平层状介质．

A method of correction for vertical groundwater movement to heat flow is presented and demonstrated for two boreholes in Jiangxi and Fujian Provinces.Bothtemperature and heat flow distlibutions are exponential functions with depth,rathelthan linear and constant because the effect of vertical groundwater movement withinpermeable layers.By one-dimension vertical Peclet number analysis of geo thermal datafrom drillholes, the conductive and convective components of heat transfer as wellas the composition of heat flow in the permeable layer can be quantified,the basalheat flow undisturbed by groundwater activity can consequently be calculated.Thismethod is applicable to homogeneous permeable medium and can be extended tohorizontally stratified medim.