Due to the depression of global oil price,the development of tight oil reservoirs is faced with severe challenges,so it is in urgent need to find out how to develop tight oil effectively and economically. In view of the quality ofsweet spotin tight oil reservoirs,it was proposed to characterize the beneficial development of sweet spotwith the concept of sweetness. First,geologic characteristics of tight oil reservoirs were investigated. Second,based on the production testing characteristics of pilot wells u...