The characteristics of the andesite reservoir have been studied in terms of drilling » logging and coring data of the A’bei andesite oil pool in Erlian Basin. A preliminary study has shown the following five characteristics’ (1) a variety of textures and structures of reservoir rock* (2) fractures as the major reservoir and migration space; (3) high water saturation; (4) anisotropic fluid flow m porous media; (5) alternation of good and poor reservoirs in a vertical section. The oil pool is a vesicular micro - fracture type reservoir. The anisotropic fluid flow will lead to a complex flow pattern, resulting in a unique production performance. So effective development methods should be adopted to achieve higher recovery.

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