Application of multi-peak pore size distribution model in pore structure analysis of shale
Received date: 2017-11-01
Revised date: 2018-01-19
Online published: 2018-03-10
As an important depiction of pore structure,the pore size distribution (PSD) plays a crucial role in affecting the flow and storage capacities of shale gas reservoirs.Mathematical description of the pore size distribution can not only properly depict the pore structure,but also provide quantitative pore structural information for the analytical models in calculating flow and storage.This article first introduced the multi-peak pore size distribution fitting model and the procedure of deriving it,then used the model to analyze the mercury injection capillary pressure (MICP) and N2 adsorption test results of six shale samples.The pore size distribution function f(r) was fitted and the cumulative pore volume v(r)was predicted.Based on the comparison of the fitted f(r)and the predicted v(r)with the experimental results,applications of the model were proposed to the prediction of flow and storage capacity in shale reservoirs.It was found that the test data of the N2 adsorption exhibited a closer configuration to Gaussian distribution than the MICP results,and therefore the associated fitting was better.Through the analysis of the v(r)predicted by the fitted multi-peak PSD function fM(r),it was further discovered that a larger percentage of brittle minerals is correlated with a higher development of mesopores;the higher the TOC or the lower the clay content,the more developed the micropores.
Lin Bo-tao,Chen Yuan,Chen Mian,Jin Yan,Jiang Zheng . Application of multi-peak pore size distribution model in pore structure analysis of shale[J]. Natural Gas Geoscience, 2018 , 29(3) : 397 -403 . DOI: 10.1176/j.issn.1672-1926.2018.01.012
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