松辽盆地榆树林油田葡萄花油层主控因素分析

Main Controlling Factors of Putaohua Oil Reservoir in Yushulin Oilfield,Songliao Basin

对榆树林油田的地质、钻井和地球化学资料分析表明,榆树林油田青1段烃源岩有机质丰度高、生烃潜力大。油源对比表明,葡萄花油层中的油来源于青1段烃源岩。储层以浅水三角洲沉积环境下的分流河道砂为主,属于中孔-中渗储层。研究区油藏类型以岩性油藏为主,油水分布平面上呈现由西南部向东北部油层逐渐减少、水层逐渐增多的趋势,剖面上呈现西南部广泛发育油层、中部上油下水、东北部水层居多的特征。研究发现,由西南部向东北部随着烃源岩演化程度的降低,油层发育逐渐减少,有效储集体的分布与油层的发育在平面上对应关系明显,生、排烃时期断层活动性强的区域更有利于葡萄花油层成藏。烃源岩成熟度、有效储集体、断层活动性控制了榆树林油田葡萄花油层的成藏。

Based on geologic, drilling horehole and geochemical data from the Yushulin oilfield, the source rock in this area is characterized by high organic matter abundance and hydrocarbon generation potential. Oil-source correlation shows that the oil within the Putaohua reservoir is mostly originated from the first member of the Qingshankou Formation. Reservoir sandstones is deposited in distributary channel environment of shallow-water delta, which can be defined as medium porosity and medium permeability reservoirs. The reservoir types in this area are mainly controlled by lithology. From southwest to northeast in a plane, the number of reservoir increases while the number of water layer decreases. In a vertical plane, the reservoir in the southwest area is rich of oil, in the northeast rich of water, while in the middle area, water is rich at the bottom layer and oil is rich at the top layer. Our study shows that the area with high maturity of source rock, effective reservoirs, active faults in the time of hydrocarbon generation is favourable for hydrocarbon accumulation, which control the behavior of the Putaohua oil reservoir.