摘要
以黄骅坳陷羊二庄油田明化镇组河流相储层为对象,在流动单元划分的基础上,综合薄片、压汞、相对渗透率曲线及数值模拟等资料,比较不同流动单元渗流特征,结合荧光显微图像及核磁共振实验刻画剩余油赋存特征。结果表明:六类流动单元渗流特征及剩余油分布差异明显。Ⅰ类流动单元渗流能力最强,水淹严重,残存少量柱塞状剩余油。从Ⅱ到Ⅵ类流动单元,毛管压力曲线中值压力不断增加,进汞曲线平缓段不断变短,最小润湿相饱和度大幅上升,残余油时水相相对渗透率不断下降,优势流线逐渐减弱,渗流能力不断下降;其中Ⅱ和Ⅲ类流动单元水淹较强,剩余油呈角隅状、膜状、吸附状分布;Ⅳ和Ⅴ类流动单元水淹相对较弱,剩余油呈连片状分布;Ⅵ类流动单元渗流能力差,水淹较弱,但剩余油储量低。该研究结果为羊二庄油田明化镇组后期剩余油挖潜提供参考。
in order to fully recognize reservoir flow characteristics and remaining oil distribution in the middle-late period of oilfield development,taking fluvial reservoir of Minghuazhen formation in Yangerzhuang oilfield as a case,six kinds of flow units were identified.Based on the six flow units,seepage discrepancy was revealed by casting thin-section,high pressure mercury injection,relative permeability curves and numerical simulation.And the distribution of remaining oil after water flooding wasquantitatively evaluated combined with fluorescent micro-image and nuclear magnetic resonance.The study indicates that there are great differences in seepage flow characteristics and remaining oil distribution of different types of flow unit.Type Ⅰ of flow units has the strongest percolation capacity and it has been watered out seriously so that there is only a little residual oil plugging the tiny pore throats.From typeⅡtoⅥof flow units,the median pressure of capillary pressure curve increases,and the plateau region of hydragyrum injection curve declines;the minimum saturation of wetting phase increases rapidly,and thus the water relative permeability at residual oil saturation declines;the development degree of dominant streamlines gradually weaken,and the percolation ability is poorer.TypeⅡ andⅢ of flow units have also been flooded severely,where residual oil is concentrated in corner of pores,adsorbed in debris or film-like covering on particle surface.TypeⅣ andⅤ of flow units are the relatively weaker watered-out areas and the remaining oil shows a flake distribution in pore-throat system.TypeⅥ of flow units presents the worst percolation ability and it is flooded slightly,but there is low reservoir abundance due to its bad reservoir nature.The above results have important guiding significance for tapping the remaining oil of Minghuazhen formation in Yangerzhuang oilfield.
出处
《东北石油大学学报》
CAS
北大核心
2018年第2期11-22,共12页
Journal of Northeast Petroleum University
基金
国家自然科学基金项目(41672129)
国家科技重大专项(2016ZX05054-012)
关键词
流动单元
渗流特征
水淹
剩余油分布
羊二庄油田
黄骅坳陷
flow unit
seepage flow characteristics
water flooded
remaining oil distribution
Yangerzhuang oilfield
Huanghua depression
