Abstract: At the top of Shahejie section developed a thin bioclastic dolomite reservoir in BZ13-1 Oilfield. Due to the control of the ancient sedimentary environment, the reservoir has followed characteristics such as thin layer, large buried depth, and lateral variation, so it's difficult to be predicted and bring great difficulties to drilling deployment. To solve these problems, analogous analysis and reservoir prediction was applied, comprehensive analysis of the reservoir characteristics and control factors of thin bioclastic dolomites was carried on, favorable area of bioclastic dolomite was forecasted and well location optimization before drilling was done. The results showed 100% drilling success rate, high-yield oil and gas flow by testing was obtained, providing a good guide for similar reservoir study.