Abstract: Luo 151 block,buried at 3 150 meters, is middle-scale oil reservoir discovered recently in Bonan depression.Based on researching of origin of igneous rock, sequence of invading,petrography and anisotropism of the reservoir,a concept model of igneous rock reservoir is set up,two types of reservoir of micro-porosity and that of erosion-fracture are recognized, three segments in vertical and four zones in horizontal are classified,and prosperous sit is predicted, proper production well net is deployed. and 14 new wells are drilled.The aver age production is 27tons per day.The authorillust rates the characters of the reservoir which are high production ability,quick decreasing,low elastic production rate.The rediscovery only can approach up most at 14.1% in way of producing by energy of natural gas,while production driven by injecting water may obtain better result.