对三肇凹陷葡萄花油层油藏的再认识

在对松辽盆地三肇凹陷杏山向斜区白垩系姚家组葡萄花油层的勘探中,以往按岩性油藏模式部署勘探,未获重大突破。根据该地区葡萄花油层顶部、底部砂岩和湖泛泥岩标准层的测井曲线形态特征,结合地层厚度变化,认为葡萄花油层为条带状河道砂体和透镜状河口坝砂体,总体由西往东、由北往南逐渐减薄,油藏形成主要受继承性断裂背斜带控制,平面油水分布明显受断层控制,油藏类型属于构造 岩性型,岩性因素使油藏进一步复杂化。按该认识进行勘探部署,使含油面积扩大102km2,预计新增石油地质储量1800×104t。图4参5

A new understanding on the Putaohua reservoirs of Xingshan synclinal zone of Sanzhao Sag in Songliao Basin, East China

In the oil exploration of Yaojia Formation (in age of Cretaceous) Putaohua oil reservoir of Xingshan synclinal zone of Sanzhao Sag in Songliao basin, no big achievement has been gotten depending on the lithological model as usually did. Based on the combination of the key bed and morphological feature of logging curve and formation thickness, a new understanding suggests that the Putaohua oil reservoir changed thinner from west to east and from north to south generally. The posthumous fault-anticline zones mainly control the formation of the reservoir and the horizontal distribution of oil and water are easily affected by the faults. The reservoir belongs to a structure-lithologic type and the effects of lithological factor made the reservoir more complex. According to this new understanding, the oil-bearing area is expanded into 102km2 and the reserve of oil will be added up to 1800×104t.