Abstract: The characteristics and influence factors of Chang 6 Formation reservoirs in the Jingbian Oilfield are studied based on the data of drilling cores,costing thin sections,X-ray diffraction of clay,SEM (scanning electron microscopy),as well as physical property in the area.The result shows that it has the petrological characteristics of lower mineral and high structure maturity.Its pore types are combinations of laumontite dissolution pores-feldspar dissolution pores-primary intergranular pores.The physical property represents that Chang 6 reservoirs are of medium-porosity extra-low to ultra-low permeability,locally of low permpability.The poret exture types are fine to micro pore with fine to micro-fine throat.The main factors affecting reservoir property are the distribution of delta plain facies in the plane and diagenesis in the vertical.