通过对松辽盆地南部中央坳陷区扶杨油层的地质解剖，将低渗透油藏“甜点”的成藏模式分为“直排型”和“断层供油型” 2 种类型。综合分析认为烃源岩、储集层、沉积物源和断层是“甜点”形成的主要控制因素。优质烃源岩发育提供充足油源，超压为排烃动力，烃源岩与储集层广泛紧密接触；泉四段Ⅰ砂组和Ⅲ 砂组含油性好于Ⅱ砂组和Ⅳ 砂组，Ⅰ砂组顶薄砂岩厚，Ⅱ-Ⅳ砂组砂体由断层沟通油源；储集层厚度大于3 m，主要沉积相为主河道和河漫滩相；主河道砂体聚油、通榆物源主河道砂体含油性好于保康物源主、次河道砂体。

Based on the geologic dissection of Fuyang reservoir in southern Songliao Basin, the accumulation pattern of “sweet point” is divided into “Directly expulsion” type and “Fault supply oil” type. The source rocks, reservoir，sedimentary source and fault are considered as the main controlling factors for the formation of “sweet point”. High quality source rocks supply abundant oil sources, and anomalous pressure is the major driving force for hydrocarbon expulsion. Oiliness of the sand group Ⅰand Ⅱis better than that of group Ⅲ and Ⅳ in Quan 4 member. The reservoir thickness is more than 3 meters. The main sedimentary facies are river channel and flood land. The oiliness of the main river channel sand body in Tongyu sedimentary source is better than in Baokang sedimentary source.