Abstract: Lacustrine carbonate rocks in member 1 of Shahejie Formation consist of biolithitic and oolitic limestone and minor ancylus fluviatilis limestones. Biolithite, made up of stratums with biofragment and fossils, have admirable pervasion ability, in which dissolve pore, organism pore and framework pore play important roles in preserving oil and gas；In general oolitic deposits were formed in shallow and high energy surroundings, and usually the elongate and loop oolites with biogenic cores predominate. As an excellent reservoir rock, oolite limestones have excellent pervasion ability and are incarnated in intergranular pore and inner pore. Rocks of Member 1 of Shahejie Formation were formed by various processes of cementation, dissolution and dolomitization under favorable conditions.

Key words: member 1 of Paleogene Shahejie Formation, lacustrine facies, carbonatite, biolithite limestone, ooide limestone, reservoir