AFM-BASED SHALE POROSITY CALCULATION AND COMPONENT PORE CONTRIBUTION EVALUATION METHOD

摘要

An AFM-based shale porosity calculation and component pore contribution evaluation method, comprising the following steps: S1, extracting shale surface three-dimensional elevation data and phase data by means of processed AFM data, and correcting the shale surface three-dimensional elevation data; S2, using a threshold method to select a height threshold, segmenting a pore function, solving the pore volume, and calculating the shale porosity according to porosity definition; and S3, obtaining a phase pore function by using a double-threshold discrete integration method, calculating the porosity in different phase intervals by using the phase pore function, performing linear fitting on the porosity in different phase intervals and the shale substance components, and calculating a correlation coefficient between the porosity and the shale substance components so as to evaluate the pore contribution of different components. The AFM-based shale porosity calculation and component pore contribution evaluation method widens the application range of the AFM in the field of unconventional oil and gas.