Estimating Elastic Parameters of Framework and Pore Fluid from CLYJ Saturated Limestone Samples

Abstract

In this paper, numerical method which is dominated by inversion is used to analyze CLYJ saturated limestone samples. Elastic parameters of rock framework and pore fluid are estimated from the overall measured density and velocity data in different porosities based on the effective inversion method. A critical porosity model is used, and elastic parameters are calculated after grouping. The estimating process includes grouping, calculating, counting and evaluating. Firstly, three samples are chosen as a group and there are N different ways to group. The samples are grouped in both integral way and individual way. Secondly, for each group the component elastic parameters are calculated based on the critical porosity model and N groups of results are obtained. Third, the results are analyzed to estimate the elastic parameters of samples. At last, the results are evaluated through comparisons of statistic parameters between the estimated values and measured ones, such as maximum, minimum, mean, and standard deviation. The results indicate that the method to estimate the elastic parameters of rock framework and pore fluid is effective and reliable. The component elastic parameters reflect the elastic properties of CLYJ limestone samples, and enrich the contents of these samples.