【摘要】：從束縛水、自由水的介電特性差異出發(fā),測(cè)量相同幾何尺寸巖樣的電容值反映其介電特性,研究了一種新的巖石孔隙水分布狀態(tài)分析方法并定量確定束縛水飽和度。采用巖石質(zhì)量-電性參數(shù)自動(dòng)測(cè)量系統(tǒng)實(shí)現(xiàn)巖石不同質(zhì)量和不同頻率下電容數(shù)據(jù)的連續(xù)采樣。掃頻測(cè)量的實(shí)驗(yàn)結(jié)果表明,100×103 Hz是一個(gè)比較理想的測(cè)量頻率,該頻率下水的分布狀態(tài)對(duì)巖石電容-含水飽和度曲線的形態(tài)影響較大,巖石電容-含水飽和度曲線呈N形分布。將N形曲線上、下拐點(diǎn)作為吸附水、束縛水含量分界線來得到巖石吸附水和束縛水的飽和度。實(shí)驗(yàn)結(jié)果表明,采用介電實(shí)驗(yàn)研究巖石孔隙水分布狀態(tài)的方法可行,并證明了巖石吸附水、微毛細(xì)管水和自由水具有不同的介電特性,且受測(cè)量頻率和含水飽和度的影響。
[Abstract]:Based on the difference of dielectric properties of bound water and free water, the capacitance of rock samples of the same geometric size is measured to reflect its dielectric properties. A new method for analyzing the distribution of pore water in rocks is studied and the irreducible water saturation is quantitatively determined. The automatic measurement system of rock mass and electrical parameters is used to realize the continuous sampling of capacitance data with different rock mass and frequency. The experimental results show that 100 脳 103Hz is an ideal measurement frequency. The distribution of the frequency in water has a great influence on the shape of rock capacitance-water saturation curve, and the rock capacitance-water saturation curve is N-shaped. The inflexion point of N curve is used as the absorbing water and the bound water content is separated to get the saturation of the adsorbed water and the bound water. The experimental results show that it is feasible to study the distribution of pore water in rock by dielectric experiment, and it is proved that rock adsorbed water, microcapillary water and free water have different dielectric properties, and are affected by measuring frequency and water saturation.
【作者單位】： 吉林大學(xué)地球探測(cè)科學(xué)與技術(shù)學(xué)院;
【基金】：國(guó)家科技重大專項(xiàng)(2011ZX0504)資助~~
【分類號(hào)】：P631.81

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本文編號(hào)：2192001