A Method for Calculating Reservoir Fracture Porosity Based on the Porous Media Model

doi:10.11885/j.issn.1674-5086.2018.08.12.02

Abstract

Abstract: To address the difficulty of calculating the fracture porosity of fractured reservoirs, a calculation method based on the porous media model is proposed. The pore aspect ratio spectrum function is defined to characterize the distribution of rock fractures and its effect on the macroscopic petrophysical characteristics of rocks. This function is added to the porous media model to account for the fractures. Theoretical calculations show a correlation between the distribution of the pore aspect ratio spectrum and the change in the bulk modulus of rocks. An inverse function of the rock modulus is also defined, and the array of acoustic logging data obtained from field measurements is utilized for the inverse calculation of the pore aspect ratio spectrum. Finally, this result is used to calculate the fracture porosity. Results obtained from actual data demonstrate that the calculation fracture porosity can better reflect the fracture development of the reservoirs and is in good agreement with the calculation results of electrical imaging logs. The fracture porosity calculated by the method proposed in this paper is consistent with the actual production of the reservoirs. Therefore, the method is considered suitable for the calculation of fracture porosity and expands the applications of array acoustic logging.

Key words: porous media model, pore aspect ratio spectrum, fracture porosity, bulk modulus, array acoustic logging

CLC Number:

TE122

LU Yunlong, CUI Yunjiang, LI Ruijuan, WANG Peichun. A Method for Calculating Reservoir Fracture Porosity Based on the Porous Media Model[J]. 西南石油大学学报(自然科学版), 2019, 41(5): 67-74.

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