Pore Structure Characteristics of Pre-disintegrated Carbonaceous Mudstone Under Dry and Wet Cycle
Taking pre-disintegrated carbonaceous mudstone(PCM)as the research object,based on Markov chain-Monte Carlo method(MCMC)and the original SEM image,the two-dimensional image and three-dimensional pore model under different dry and wet cycles were reconstructed.The recon-structed results were compared with the original image and mercury injection test results respectively,with the porosity as the control condition,to verify the reliability of the reconstructed model.The re-sults show that with the enlargement of the domain scope,the fit between the reconstructed two-di-mensional image and the original SEM image increases.The maximum porosity error rate is 1.77％and the minimum porosity error rate is 0.91％under different dry and wet cycles.After the dry-wet cycle,the pore distribution curve of the pre-disintegrated carbonaceous mudstone moves to the right and upward.After six dry and wet cycles,the curve shows four peaks,with the peak value increasing to 0.120 6％in the range of 0.1～2 μm.The overall porosity of the reconstructed 3D pore model is 10.887％,25.176％,31.259％and 31.838％,respectively.There is a maximum porosity error of 3.316％compared to the original image,and a maximum difference of 3.96％compared to the mercu-ry injection test results.The reconstructed 3D pore model is divided into 5 layers,and the maximum error between the porosity of each layer and that obtained by mercury injection test is 3.28％.The re-constructed 3D pore model of pre-disintegrated carbonaceous mudstone has strong reliability,and can be used for numerical simulation tests to study the strength and seepage characteristics of pre-disinte-grated carbonaceous mudstone under different dry and wet cycles.
万方数据
维普
