摘要
乌南油田N12主要为一套三角洲前缘-滨浅湖亚相的沙泥沉积,储层属于特低孔特低渗储层。利用储层的测井物性解释资料,结合岩心分析资料,对研究区N12储层的层内、层间、平面非均质性进行了研究。研究表明,总体储层非均质性强。层内非均质性与沉积微相密切相关,单砂层垂向上渗透率以正韵律和反韵律为主,夹层多。各沉积微相非均质性强弱依次为:水下分流河道、河口坝、远沙坝-席状沙、坝核、坝缘、沙滩。层间渗透率差别大,Ⅰ、Ⅱ油组非均质性最强,单层层数越多,层间非均质性越强。储层平面非均质性变化受沉积相控制,渗透率平面变化较大,砂体相变较快,连通性较差。
Wunan Oilfield N12 reservoir is mainly of silt deposition of delta front-offshore shallow lacustrine intrafacies,the reservoir has the characteristics of very low porosity and permeability.In this paper,the logging matter interpretation data of reservoirs and the core analysis data are used to investigate the intra-layer,inter-layer,planer heterogeneity of the N12 reservoir.The heterogeneity of intra-layer is closely related to sedimentary micro-facies.Permeability of single sand-layer in the vertical direction shows the priority of positive and reverse rhythm.The microfacies heterogeneity is weak in the order of underwater distributary channel,mouth bar,far sand barrier-sand sheet,dam nuclear,dam edge to sandy beach.The permeability of inter-layer is difference,Ⅰ,Ⅱoil formations have the strongest heterogeneity,the more single-layer,the stronger heterogeneity is.The reservoir changes are controlled by sedimentary facies,and plane permeability is varied considerably with rapid sand phase transition,poor connectivity.
出处
《长江大学学报（自然科学版）》
CAS
2011年第2期11-13,278,共3页
Journal of Yangtze University(Natural Science Edition)
关键词
乌南油田
N12油藏
储层非均质性
三角洲前缘
滨浅湖
Wunan Oilfield
N12 reservoir
reservoir heterogeneity
delta front
offshore shallow lake
