Application of HighResolution Sequence Stratigraphy in the Study of the Reservoir Macroheterogeneity:Taking the Fuyu oil layer of Chao 1Chaoqi 3 blocks in Chaoyanggou oil reservoir of Songliao Basin as an example

Key words: 
• highresolution sequence stratigraphy /
• baselevel cycle /
• Songliao Basin /
• Fuyu oil layer /
• macroscopic heterogeneity

Abstract: In application to highresolution sequence stratigraphy principles and methods, forty one shortterm baselevel cycles and seven middleterm baselevel cycles and two longterm baselevel semicycles in Fuyu oil layer of Chao 1 Chao gas 3 blocks of Chaoyanggou oil field are identified. By the sedimentary dynamics analysis of genesis of multiage baselevel cycles, quantitative analysis of the core testing and statistical data which characterize the macroscopic heterogeneity of the reservoir, we point out that with the uprising of the longterm baselevel cycle, inlayer heterogeneity of shortterm baselevel cycles becomes stronger, and interlayer heterogeneity of middleterm baselevel cycles becomes weaker, and plane heterogeneity of shortterm baselevel cycles becomes stronger. With the subsiding of the longterm baselevel cycle, every trend is contrary. By analysis, the changes of sedimentary environment that are caused by the changes of baselevel cycles and associated accommodation are the determinative factors for feature differences of reservoir macroscopic heterogeneity.