CX盆地露头岩样电阻率测试与分析

RESISTIVITY MEASUREMENT AND ANALYSIS OF ROCK SAMPLE IN CX BASIN

本次实验的主要目的是对 CX地区露头完好的岩样进行电阻率测试 ,提出了一种利用露头岩样电阻率绘制模拟地层条件下仿真电阻率测井曲线的新方法。该方法的主要思路是 :1在 CX地区选取一条露头出露较完好的地质剖面 ,在野外进行详细的岩性、地层产状和厚度描述 ,并采集露头岩石标本。 2对所取岩样进行常温常压下的密度、孔隙度和电阻率测试 ,并选部分代表一定岩性的岩样进行模拟地层环境 (压力、饱和度、矿化度 )下的电阻率测试 ;3分析地层条件下的测试结果 ,得出该地区电阻率随饱和度、压力及矿化度变化规律的经验公式 ;4利用地质剖面的岩性和厚度资料 (由许效松等提供 )及常温常压下地表岩样测试资料 ,根据所得到的经验公式计算出地层条件下的岩石电阻率并模拟出仿真电阻率测井曲线。所得到的电阻率模拟测井曲线的效果较好 ,尽管所测试的岩石资料来自 CX盆地 。

The aim of experiment involved in this study is to measure the resistivity of intact rock samples in the CX basin.A new methed of drawing resistivity logging curve under the condition of simulated stratum,by using the resistivity measured from the bedrock was proposed.The train of thought of this method is as follows:①selecting a well exposed geological section in the CX area,describing the lithology,attitude and thickness of strata and collecting samples;②measuring the density,porosity and resistivity in real stratum conditions(such as pressure,saturation,mineralization);③analysing the measured results and determining the empirical formula of rock resistivity varied with the pressure,saturation and mineralization;④calculating the resistivity of tock and simulating the resistivity logging curve.The obstained resistivity logging curve achieved good result.