长庆油田三叠系油藏相渗形态及储渗特征

Permeability Ratio Curve Shape and Characteristics of Reservoir and Filtration of Triassic Reservoir in Changqing Oilfield

根据长庆油田三叠系油藏的油水两相渗流特征,按油水相对渗透率曲线形态将其分为Ⅰ型、Ⅱ型和Ⅲ型3种形态,并进一步研究不同相渗形态油藏在地质特征、渗流规律和动态上的不同表现。结果表明,Ⅰ型油藏粘土矿物含量最低,储层非均质性最弱,流体渗流方式由均匀型向非均匀型转变幅度最小,速度最慢,动态上表现为同一阶段含水上升率最小,递减率最低;Ⅱ型油藏储层非均质性中等,渗流方式变差速度中等,含水上升率和递减也位于中等水平;Ⅲ型油藏储层非均质性最强,渗流方式变差速度最快,同一阶段下含水上升率和递减最大。

Based on the infiltrating fluid feature of oil and water phase in Triassic reservoirs in Changqing Oilfield,it can be divided into three types:Type Ⅰ,TypeⅡand Type Ⅲ according to the curviform.furtherly,the geologic characteristics,filtration laws and dynamic performance of different effective permeability reservoirs are studied.Study shows that the content of clay mineral of Type Ⅰis the lowest,reservoir heterogeneity is the weakest,transition range and transition rate from homogeneity to heterogeneity is the lowest,water-cut increase and decrement are the minimum.Reservoir heterogeneity、transition rate from homogeneity to heterogeneity,water-cut increase and decrement of TypeⅡare moderate.Reservoir heterogeneity of model Ⅲ is the strongest,transition rate from homogeneity to heterogeneity is maximum,water-cut increase and decrement under the same phase are the largest.