Validity of Geophysical Method to Determine Multi-Mineral Model, Specific Porosity, Permeability of Basement Rock in the Cuu Long Basin, Vietnam

Abstract

The oil body in the fractured basements is characterized by complex geological structure, high heterogeneity and especially hydraulic properties. This requires a special and appropriate approach to investigate the oil body. The penetrating space is the cavity cracks, formed by many impacts such as tectonics, mineral composition, weathering, magma shrinkage, loading, and heat transfer. The calculation and simulation of the permeability, therefore, are facing many difficulties. Geophysical methods carry out the useful information about the reservoir such as a closer approach compared with different approaches. This research, therefore, applies FMI/DSI (formation micro image/Dipole shear Sonic Imager) method based on the support of FRP (Fractured reservoir petrophysics)-Well Insight software (Eastsea Start) to simulate the relationship between physical parameters with the fraction of minerals to determine the porosity parameters through logging. The results were verified by the high correlation coefficient between the theoretical and practical curves (GR: 98.69%, RHOB: 94.87%, DT: 86.81%, NPHI: 96.35%), and the results were checked with the sample data for reliability.