Abstract:

This is a case study of Fuyu oil layer in C107 block, Changchunling oil field, which analyzed the architecture of meandering river reservoirs by hierarchy method with the data of lithology, logging, dynamics and testing etc. Based on the identification of single channel sandbodies and modern meandering river pattern, interwell correlations of these sandbodies were conducted by faciesdominated principle and four association models of point bars have been developed such as sigmoid, orthokinetic, antitropic, and dissected. In the study area, eight point bars with areas ranging from 0.02 km2 to 0.16 km2 were identified according to the thickness of point bars and characteristics of adjacent abandoned channels. Integrating the data of logging, core and wireline well log, identification of lateral accretions, and analysis of analogous wells, dip angle of lateral accretions was calculated to be about 5° and the width of lateral accretions was expected to range from 25 m to 70 m. Therefore, quantitative model for architecture of point bars was established by these parameters. The results of meandering river’s architectural analysis provide an insight into thermal production dynamics.

Key words:  reservoir architecture, hierarchy analyzing, meandering river, point bar