Abstract: The petroleum potential, reservoir conditions, the types of oil/gas pools and exploratory method of hidden oil/gas traps developed in lacustrine carbonate rocks were discussed. It is concluded that the carbonate rocks in semi-lacustrine and deep lacustrine facies would be good source rocks;and limestones (dolomites) of beach and bioherm facies may be regarded as favourable reservoirs. While their reservoir spaces include primary porosity, secondary corroded hollows and caverns, fissures and composite pores. Lithologic and stratigraphic traps are dominant, along with diagenetic and structural traps as less common oil/gas pools. Moreover, from various angles,the paper comes to a brief conclusion on the research approaches and exploratory methods for hidden oil/gas pools in lacustrine carbonate rocks.