Abstract: This paper analyzes domestic and foreign reservoir characters，accumulation factors and distribution of basement
reservoir and concludes that basement is formed before basin and distributed in any platforms. There is one basement in
simple basin. In superimposed basins there must be a long hiatus or tectonic movement so that they can have both new and
old basements. Basement hydrocarbon reservoirs can be divided into two types：the reservoir on top of buried hills and the
reservoir inside buried hills. The reservoirs are composed of granite and eruptive rocks，and have particular effective reservoir
spaces and have strong heterogeneity. Characteristics of them include that they are early oil generation and late reservoir，early
accumulation period and early trap generation. They have various of trap types and migration modes，and have complex inside
composition and translocation systems. The world’s largest oil and gas reservoirs are located in depression basin，and most
Chinese reservoirs distributes in eastern fault basin and in northern flexural basin and old basement of superimposed basins.

Key words: basement hydrocarbon reservoir, buried hills, reservoir types, reservoir forming characteristics, distribution characteristics