Characteristics of Sandstone Reservoir in Xujiahe Formation of Well PL-1 in Puguang Gas Field
This paper uses reservoir lithology and mineral analysis technique and combines with log data to study the rock characteristics,pore type and physical property of Well PL-1 and performs a comprehensive evaluation of reservoirs.The results indicate that the physical property of sandstone reservoir is low porosity and permeability,extreme-low porosity and permeability;the reservoir pore type of the sandstone mainly is secondary pore,structural fractures are well developed,but they are filled by calcite and quartz.The reservoir mainly develops 2 types of good reservoirs and 3 types of poor reservoirs,early compactions on reservoirs,original pores are hard to be preserved,fluid mobility caused by blockage of pore constriction slows down the speed of dissolution,which are the reasons of tight reservoirs.