New Methodology for Ultrasonic Microscopy Imaging of Carbonate Reservoirs’ Pore Structure

Carbonate reservoirs often have complex pore networks, which makes accurate characterization of their pore structures a technical challenge. Due to the complexity and heterogeneity of carbonate reservoirs, the analysis and processing of ultrasonic scanning images face many challenges, and there is also a lack of systematic characterization methods for pore structures. Therefore, based on the full utilization of ultrasound microscopy imaging technology, this article conducts research on the new methodology for ultrasonic microscopy imaging of carbonate reservoirs’ pore structure, starting from three aspects: digitization of pore contours, characterization of pore morphology, and three-dimensional (3D) morphology characterization. Firstly, an ultrasonic microscopy imaging method for the pore structure of carbonate reservoir cores is constructed to achieve high-resolution acquisition of multilayer pore structure data. Subsequently, an effective identification method for pore structure is developed by combining the target and non-target differences in ultrasound microscopy images of pore structure. Construct multivariate descriptive factors and expression methods from both horizontal and vertical dimensions to achieve macroscopic and microscopic characterization of pore structures at different depths. Finally, a comprehensive analysis is conducted based on actual sample cases, which proved that the method described in this article can provide multivariate data support for the two-dimensional (2D) and 3D quantitative characterization of pore structures in carbonate reservoirs at different depths, achieving multiscale and all-round descriptions. This paper provides a new quantitative analysis method for the field of oil and gas development and resource utilization, with broad application prospects.