According to much datum of rock thin section, X diffraction, physical property and heavy mineral, combining with explaining results of well logging about reservoir physical property, this paper studied synthetically many aspects of Saertu reservoir in west slope region, such as diagenesis, lithological combination, feature of physical property and pore type, matched and established physical modelfor forcasting porosity and permeability of sands．It concluded that reservoir in west slope region has middle-high porosity and high permeability, its lithological combination and diagenetic level are beneficial to form secondary pore．And meanwhile secondary evolvement between clay minerals, eldspar and clay minerals are of main dominating factors, it also gained that rich belt of host illlitecan be an existing symbol to find secondary pore．Synthesizing most characteristics of reservoir, including lithology, physical property,  secondary founction after diagenesis, porosity and permeability, this paper divided reservoir in to four types, which are Ⅰ(good), Ⅱ(middle), Ⅲ(bad), Ⅳ(extremely bad), there aretheⅠand Ⅱtype reservoir in the region, from Fulaerji to Qiqihaer region and west overlap belt were considered to be the most favorable areas for gas and gasto accumulate through comprehensive analysis．Each trap and secondary pore belton the oil and gas migrath pathway was considered to be the most favorable goals of gas and oil exploration.