Abstract
The evaluation of reservoir rock pore structure is the basic research work for the exploration and development of unconventional oil and gas fields. In this work, the CT scanning experiment of tight sandstone was carried out, the gray value distribution of the CT image was analyzed, and the three-dimensional reconstruction of the rock sample was conducted by the linear interpolation method after the threshold segmentation. The results show that grey level are centrally distributed between 0∼150 in the original CT image. The pixels with the gray value in the 50-100 interval have the highest occurrence frequency. The pore diameter of the tight sandstone sample is small, the distribution is scattered, and the connectivity is poor.
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