Study on Fractal Structure of Pore Space of Sandstones Based on NMR and Capillary Pressure Curves
Z. Zhang, W. Debschuetz and A. Weller
Event name: Near Surface Geoscience 2013 - 19th EAGE European Meeting of Environmental and Engineering Geophysics
Session: Laboratory Studies of Soil and Rock Physics
Publication date: 09 September 2013
Info: Extended abstract, PDF ( 337.43Kb )
Price: € 20
We apply the fractal equation of pore distribution and NMR spectrum to 25 sandstone samples from several boreholes in China, and we show the results of the relations between NMR, fractal dimension and capillary pressure. The fractal dimensions can be calculated from NMR and capillary pressure data, and the value of correlation coefficient could indicate whether the pore structure shows fractal features. For the same core sample, there are different fractal dimensions in different pore radii ranges, indicating that core pore space has multiple fractal structure. The fractal dimensions determined from NMR data is lower than the values determined from capillary pressure data, this is due to the different pore throat space reflected by these two methods. The fractal dimension from NMR data can better represent the rock’s physical properties.