低渗透油田高含水期储层物性特征及主控因素——以安塞油田延长组长6_1储层为例

Physical characteristics and main controlling factors of high water cut stage in low permeability oilfield——Taking Chang 6_1 of Yanchang formation in Ansai oilfield

为了找出低渗透油田高含水原因,解决低渗透油田高含水期高效开发的问题,针对安塞油田延长组长6_1开发储层,应用岩石薄片、铸体、扫描电镜和恒速压汞等方法,开展水驱储层物性特征和主控因素分析。研究结果表明,安塞油田延长组长6_1储层高含水原因与油水井之间的物性特征具有较高的正相关关系,物性特征越好,注水开发受效越早,见水时间越早,含水上升越快,相似连通性,见水时机与微观孔隙结构的好坏成正相关关系;水驱储层物性明显受沉积环境、埋藏深度和成岩作用控制,水下分流河道、河口坝、河道侧翼和前缘席状砂油井含水依次下降,受效依次减弱。

In order to find out the reasons of high water cut in low permeability oilfield,solve the problem of high efficiency development of low permeability oilfield in high water cut stage.In view of the Chang 61 reservoir of Yanchang formation in Ansai oilfield,through the rock thin section,casting,scanning electron microscope,constant-rate mercury injection,etc.Analysis of the physical characteristics and the main control factors of water-flooding reser-voir.Theresearch results show that Ansai oilfield to extend the physical characteristics of Chang 61 reservoir in high water cut causes with oil and water wells between higher is correlation,better physical properties,water flooding development effect sooner,in the earlier water breakthrough, water cut rising faster similar connectivity, see water time and micro pore structure of the stand or fall of a positive correlation with.Water flooding reservoir layer was significantly affected by depositional environment and burial depth and diagenesis control.Underwater distributary channel,mouth bar, channel flank,and front sheet sand water content of the oil decreased response was decreased in turn.