Reservoir Pore Characteristics Based on Depositional Microfacies Control in the Neogene Guantao Formation, Bohai Bay Basin, China

The Neogene Guantao Formation Reservoir in the PLOilfield is a unconsolidated sandstone with high porosity and permeability. reservoir diagenesis weak dominated by compaction diagenesis. At present, insufficient research into relationship between pore characteristics sedimentary microfacies of shallow delta reservoirs restricts prediction favorable distribution. This article takes as object analyzes potential coupling microfacies. In this study, seven typical were identified microscopic different are described. results show that structure various comprehensively influenced rock texture, siliceous minerals, clay mineral Characterized more abundant hard quartz feldspar positive skewness, lower sorting coefficients, arenaceous possess larger throat radius fractal dimensions than argillaceous Finally, due to difficulty coring offshore oilfields lack data on mercury injection experiments, empirical formulas for porosity, permeability, conventional core tests established, corresponded 35% saturation (r35) was used characteristic parameter. grey correlation method analyze influence factors content differences r35 determine main controlling factors.