石西油田石炭系油水分布规律及含油性评价

THE CARBONIFEROUS OIL/WATER DISTRIBUTION AND ASSESSMENT OF HYDROCARBON POTENTIAL IN SHIXI OILFIELD

王屿涛

Wang Yutao

新疆石油管理局勘探开发研究院, 克拉玛依, 834000

Research Institute of Exploration and Develepment, Xinjning Petroleum Administration, Karamay 834000

石西油田石炭系火山岩油藏油水分布在平面上具有明显规律,即由南向北原油性质逐渐变重,且不受构造的控制,地层水的变化则东、西两块有别,西块为低矿化度水分布区,离子浓度梯度由南向北;东块为高矿化度水分布区,高于浓度梯度由西向东.综合研究认为,原油和地层水的迁移方向均由南向北;油自中部断裂是分隔东、西两侧地层水分布并进而影响油气丰度的主要因素.

There is obvious pattern for oil/water distributiaon in the Carboniferous volcanic reserviors of Shixi oil-field. The specific gravity of crude oil increase towards the north and it is not controlled by structures. It is different in east and west blocks for characteristics of formation water. Water with low salinity is distributed in the west block and the gradient of ionic concentration is from south t0 north; and water with high salinity is distributed in the east block and the gradient of ionic concentration is from west to east. It is suggested that migrati0n direction of oil and formation water was from south to north and the fault in the middle of the reservi0r was a main factor in influencing distribution of formation water and hydrocarbon abundance.

https://doi.org/10.11781/sysydz199801044