| Abstrakt: |
The most important reservoir parameter that is of special importance is the study and analysis of porosity in hydrocarbon reservoirs. In this study, after studying and classifying the types of intergranular, fracture and vuggy porosity, the relationship between permeability and porosity in the reservoir is discussed in the North Rumaila oil field in southern Iraq. In this study, the binarization and edge detection methods were used in FMI image logs to calculate porosity of reservoir. Using the binarization method, vuggy porosity is separated by applying a cutoff in the image, and in the edge detection method, formation fractures are identified by taking the derivative of the image. Intergranular porosity is determined using well logs, while various types of fracture and vuggy porosity are calculated using FMI image logs. The deviation velocity diagram of the porosity state was examined and compared with the results obtained from FMI logs. The results show a very good correlation of the calculated porosity. Deviation velocity diagrams and Stoneley waves showed that as the deviation velocity decreases, the permeability increases exponentially. The secondary porosity was calculated using well logs, and the results were compared with FMI image logs. The results showed that the porosity obtained by both methods was consistent. The slight difference in determining the secondary porosity is due to the higher resolution of FMI logs compared to conventional logs. Permeability in the Mishrif reservoir in the North Rumaila oil field is related to intergranular and fracture porosity, while vuggy porosity is non-permeable. Comparison of the results of fracture porosity and permeability showed that in the presence of fractures in hydrocarbon reservoirs, high permeability is observed. This is while all fractures have permeability. [ABSTRACT FROM AUTHOR] |
