Abstract:

Based on methods of core analyses, petrographic images, capillary pressure curves and T2 relaxation time curves of nuclear magnetic resonance, the microscopic characteristics of pore texture and evaluation for the Fu-Yang oil reservoirs are comprehensively studied.In this paper, three topics are discussed as follows:(1)Physical character of reservoirs, and relation between porosity and permeability;(2)The microscopic characteristics of pore texture and its influence upon porosity and permeability;(3)Permeable ability, saturation of mobile fluid and evaluation of the Fu-Yang oil reservoirs. It is summarized that the development of favorable or impermeable reservoirs and saturation of mobile fluid in low permeable sands is controlled by these factors, such as the amount of pores, pore-throat size, shape, distribution,and connectivity of pores.

Key words: low-permeable reservoir, microporosity, pore texture, driving pressure, saturation of mobile fluid