Logging Parameter Evaluation for Low-porosity and Low-permeability Reservoir of Xujiahe Formation in West Sichuan

Reservoir of Xujiahe formation in west sichuan has poor physical property,inconstant lithology,multform reservoir pore space,and complex porosity character,ect.Therefore,The traditional logging evaluation methods are limited in many ways.Reservoir characterization analysis show that the reservoir property are controlled by sedimentary context,lithology and pore structure,favorable reservoir mostly located top of Prograding lay and bottom of retrograding lay.According to the features,established and developed a set of evaluation methods of reservoir parameter,based on petrophysical character and pore structure of reservoir.Through practical application,It was showed that the set of methods can improve dependability of logging parameter evaluation for low-porosity and low-permeability and enlarge the range of model application.