Evaluate And Research Available Reserves In Chang2 Reservoir In Bailangcheng Region

The Oil-bearing formation of Chang 2 in Bailangcheng oil field is a typical low permeability reservoir.Currently,the main problem for Chang 2 is the low available reserves after constantly development of more than 20 years.With the increased oil production scope and water injection time,the development results and oil available reserves have been greatly influenced by the heterogeneity of reservoir and the distribution of fractures in the reservoir.Aiming at these scientific issues,the knowledge of stratigraphy,petrology,sedimentology,mathematical statistics and modern experimental analysis technologies were used to analyze the properties of Chang 2,and then the oil production potential can be excavated to promote the efficiently development of oil in Bailangcheng oil field.Based on the geological characteristics and development status of Chang 2,the oil geological reserves were calculated accurately at both the south and north of the fault with the volumetric method.After that,the comprehensive recovery of oil at these two regions were also calculated with four different methods,including empirical formula method,indoor experiment method,the water drive characteristic curve and production decline law.According to the technical available reserves of Chang 2,the current available reserves were also discussed.With the detailed research of the distribution of the available reserves,the valid countermeasure to improve the degree of available reserves was presented in this thesis.The research findings have a guiding significance on the efficiently development in Bailangcheng oil field.