Study On The Characteristics Of Chang 2 Reservoir In Qisheng 18-6 Well Block Of Wuqi Oilfield

This paper studies the Chang 2 reservoir in Qisheng 18-6 oil block of Wuqi Oilfield.The development of this well block began in the 1990s,and has been relying on the crude development of natural energy.The characteristics of the Chang 2 reservoir in this area have not been studied scientifically and systematically.According to previous research data,guided by basic theories such as reservoir petrography,petroleum geology,sediment petrology,and reservoir geology Based on the analysis of basic data such as mercury injection experiment data,cathodoluminescence analysis report,scanning electron microscope data,nuclear magnetic resonance,reservoir sensitivity identification report,etc.,and according to the basic geological maps and relevant background information such as regional sedimentation.structure,etc.,the modern reservoir description method is used to identify the regional stratigraphic marker bed,compare and divide small layers,study sedimentary microfacies and sand body distribution rules,and study reservoir characteristics of Chang 2 oil formation,We have gained a clear understanding of the missing layers,structural characteristics,sedimentary microfacies,sand body distribution characteristics,and reservoir characteristics in the region,providing geological basis and theoretical guidance for oilfield water injection development and production,tapping remaining oil resources,and reasonably and effectively developing oil reservoirs in the research area.Select parameters such as sandstone thickness,porosity,permeability,median pressure,and pore throat radius to form a comprehensive evaluation standard for the Chang 2 reservoir in this area.Divide reservoirs into four categories:Class Ⅰ high-quality reservoirs,Class Ⅱa good reservoirs,Class Ⅱb general reservoirs,and Class Ⅲ poor reservoirs.Among them,ClassⅠ high-quality reservoirs should be the main exploration and research area in the future.