1�� Post-doctoral Research Station��Southwestern Branch of SinoPEC��Chengdu 610081��China; 2�� College of Resource and Environment��Southwest Petroleum University��Chengdu 610500��China; 3�� Exploration and Development Research Institute��Southwestern Branch of SinoPEC��Chengdu 610081��China

Low-porosity and low-permeability reservoirs in western Sichuan are characterized in poor physical property��inconstant lithology��diversified reservoir space type and complex pore structure�� Thus��the traditional methods of well logging evaluation in reservoir parameters are limited in many ways��which is the main factor in restriction of the reservoir evaluation�� Based on the basic character analysis of reservoirs such as physical property�� pore structure and probability theory��a set of evaluation methods of reservoir parameters is established and developed�� Practical application showed that these methods not only greatly improved the dependability of parameters evaluation�� but also enlarged the application range of model in low-porosity and low-permeability reservoirs��