海上低阻油藏注水开发影响因素分析

Analysis of factors influencing water injection development in offshore low resistance oil reservoirs

低阻油藏储层的研究一直是国内外油田开发人员亟待解决的难题之一。本文结合岩心、薄片、扫描电镜、物性及黏土矿物分析化验数据,H油田Ⅳ油组储层成岩作用可见压实作用、胶结作用和溶解作用。胶结物泥质、高岭石、菱铁矿和黄铁矿是影响该段储层物性的主要因素,主要的建设性成岩作用为溶解作用,溶解作用对改善储层的储集性能更为有利,产生的次生孔隙及裂缝一定程度上改善了本井的孔隙结构。Ⅳ油组储层分析样品含油饱和度随着地层深度增加呈现递增趋势;而含水饱和度随着地层深度增加呈现递减趋势;含油饱和度平均为7.5%;而含水饱和度平均为84%。Ⅳ油组深度2094.35~2129.39 m划分为中成岩A期,2130.00~2136.42 m划分为中成岩B期。研究成果为低阻H油田储层的高效开发提供了依据。

The study of low resistance oil reservoirs has always been one of the urgent problems that oilfield developers at home and abroad need to solve.This article combines core,thin section,scanning electron microscopy,physical properties,and clay mineral analysis data to show that compaction,cementation,and dissolution can be seen in the diagenesis of theⅣoil group reservoir in the H oilfield.Cement mud,kaolinite,siderite,and pyrite are the main factors affecting the physical properties of the reservoir in this section.The main constructive diagenesis is dissolution,which is more beneficial for improving the reservoir's storage performance.The secondary pores and fractures generated have to some extent improved the pore structure of this well.The oil saturation of theⅣoil reservoir analysis samples shows an increasing trend with the depth of the formation.The water saturation shows a decreasing trend as the depth of the formation increases.The average oil saturation is 7.5%.The average water saturation is 84%.TheⅣoil formation is divided into intermediate diagenetic stage A at a depth of 2094.35~2129.39 m,and intermediate diagenetic stage B at a depth of 2130.00~2136.42 m.The research results provide a basis for the efficient development of low resistance H oilfield reservoirs.