河流相储层沉积模式及对剩余油分布的控制

Reservoir sedimentary model of fluvial facies and it′s control to remaining oil distribution

研究了济阳坳陷沾化凹陷东部的孤岛、孤东油田的馆陶组河流相储集层的沉积模式 ,探讨了河流相储集层的剩余油分布规律及其对剩余油形成、分布的控制。河流相储层发育了沉积和油藏规模两种非均质性 ,两种非均质结合是控制该区剩余油宏观、微观分布的主因。宏观上 ,剩余油分布在主力油层、储层正韵律中、上部及低孔渗流沉积单元内和注采不完善地区。微观上 ,在水淹较低部位仍有网络状、斑状剩余油 ,在储层物性好的局部死区有孤立的剩余油。

The reservoir sedimentary models of fluvial facies in Guantao group of Gudao and Gudong Oilfields in the eastern Zhanhua sag were studied.The remaining oil distribution in the fluvial facies reservoirs and its control to the formation and distribution of the remaining oil were discussed.The fluvial facies reservoir in this area developed two sizes of heterogeneous sedimentations.The combination of the two heterogeneities is the main factor for controlling the macroscopic and microscopic distribution of the remaining oil in the fluvial facies reservoir.The remaining oil is macroscopically distributed in the pole oil layer,the median and top of the main rhythm,and the units with low seepage,and the areas where the injection_production technology is unperfected.From the microscope,the netlike and spotted remaining oil still exists in the lower watered_out position and a part of blind area with the finer reservoir characteristics.The study result indicates that the sedimentary model is the most important factor for controlling the distribution of remaining oil in the fluvial facies reservoir.