Abstract:

Taking multicyclic carbonate reservoirs in the2 nd interval of the2 nd member of the Lower Triassic Jialingjiang Formation in theMoxi gas field as an example，and from the perspective ofm icroscopic pore-throat structure and reservoir genesis，this paper puts forward a geology-constrained logging evaluation method of permeability based on experimental data such as core observation，physical property analysis，mercury penetration，cast and electron scanningm icroscope.Various logging interpretationmodels ofpermeability are setup according to different lithologies and pore-throat structures.Practical application shows that permeability obtained with this method correlateswellwith core analysis and can accurately characterize permeability ofmulticyclic carbonate reservoirswith great heterogeneity.This new method provides another reliable tool for reservoir evaluation.

Key words: porosity-permeability relationship, permeability model, pore-throat structure, Jialingjiang Formation, carbonate rock reservoir, Middle Sichuan Basin