重力测井技术应用于油藏注水动态监测的可行性研究

注水开采技术现已广泛用于三次采油。该技术的关键是正确地确定油层中注水区分布范围及其前线位置和运动状态。本文用正演模拟法证明：在一定条件下，重力测并方法可用于四定油层中注水波及面积、跟踪注水前缘位置和确定注水前缘推进方向等。对孔隙率大于15％、含水饱和度变化率大于50％的砂岩层，采用高精度重力测井方法至少可监测到距观测井50m范围内注水前缘的变化，并可监测出以注水井和观测井连线为零线的±60°范围内注水前缘推进方向的变化情况。

Feasibility of applying gravity logging method to reservoir waterflooding monitorin

At the present time, reservoir waterflooding technique is widely applied to third-time oil recovery. The key to this new technique lies in determining correctly waterflooded area and monitoring the location and movement situation of waterflood front in reservoir. Forward modeling shows that under certain condition gravity logging method can be used to map the waterflooded area and to know the location and movement situation of the waterflood front in reservoir. By applying accurate gravity logging method to the sandstone reservoir whose porosity is above 15% and where the variation rate of water saturation may be higher than 50%,we can monitor both the moving waterflood front within 50m from observation borehole 8nd the moving direction variation of waterflood front in the 120 degree fan area whose symmetric axis passes injection borehole and observation borehole.