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Abstract
A pore-throat radius full-scale distribution is defined according to the molecular size of formation fluid and the lower limit of pore-throat radius distribution, in order to study the integratedcharacteristics of micro-nano pore-throat systems in tight oil reservoirs. In this study, we established a new full-scale characterization method for pore-throats through contrasting experimental data of high-pressure mercury injection and low-temperature nitrogen adsorption, optimizing the valid data intervals of the full-scale pore-throat radius distribution. Then, the data of full-scale pore-throat radius distribution is checked and corrected based on the experimental data of NMR and centrifugation. Finally, the mesopore data is derived from low-temperature nitrogen adsorption and the macropore data is derived from high-pressure mercury injection. Moreover, the steps to characterize full-scale pore-throats include one unified dimension, one data optimization, two interpolations, one connection, one data test and one data correction. The full-scale characterization of pore-throat radius distribution in tight oil reservoirs of Daqing, Changqing, Sichuan and Dagang shows that the pore-throats of tight sandstones are mainly distributed in the submicron-nano-scale, and 50% of permeability is contributed by submicron pores. Therefore, it is challenging to effectively develop the tight oil reservoirs with permeability less than 0.08 mD in Daqing and lower than 0.03 mD in Changqing. For tight carbonate matrix, pore-throats are mainly distributed in the nanoscale space, and the permeability is mainly contributed by macropores or fractures, so the developmental degree of fractures and other factors shall be considered for estimating the development limit.
Published Version
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