石西油田石炭系水动力特征及其与含油性关系

Relationship between hydrodynamic features and oil accumulation in Carboniferous System of the Shixi Oilfield

利用油层流体的物化参数对油藏所处的水动力环境、油气运移方向及断层的封闭性进行了分析判断。研究结果表明,石西油田供水区在石007井东断裂西侧,并且由西向东渗入;石007井东断裂具有良好的封闭性,断裂东侧较西侧封闭,水动力也较西侧弱,使东断块油气较西侧易于保存,东断块含油显示也明显好于西断块。石西油田原油的物理性质与水动力环境有一定关系,但在平面上原油性质的变化主要受油气运移层析效应的控制。西断块水动力强,原油性质变化速率大;东断块水动力弱,原油性质变化速率小。油气运移方向为东、东北向西、西南,原油性质也沿该方向降低。

The hydrodynamic conditions, migration direction of oils and gases, closure condition of the fault are analyzed using the physicochemical parameters of the fluid of the reservoir. The results indicate that the water supply area is in the west of the east fault, which lies in the east of the Shi007 well, and the water filters from west to east. The east fault is well closed, and the east blocks of the fault is closed better than the west blocks of the fault, so the hydrodynamic force in the east blocks is weaker than that in the west blocks, therefore, the oils and gases in the east blocks are easier to be preserved than in the west blocks. The show of oils and gases are better in the east blocks than in the west blocks according to field observation. The oil features in the Shixi Oilfield are affected by hydrodynamic environment, but the change of oil features on plane are mainly controlled by migration of oils and gases. The hydrodynamic force in the east blocks is weaker than that in the west blocks, so as to the change speed of oil features is slower in the east blocks than those in the west blocks. The migration direction of oils and gases is from east or northeast to west or southwest, and oil features fall down along this direction.