基于核磁共振技术的储层微观特征分类评价——以王龙庄油田阜宁组为例

Reservoir Characteristics and Classification Evaluation Based on NMR Technology:An Example of Funing Formation in Wanglongzhuang Oilfield

储层分类评价对于油田开发具有重要意义,而核磁共振技术在储层评价中的应用越来越广泛。利用核磁共振、扫描电镜、重矿物、薄片等实验数据,采用记点统计、离心截止值筛选、T2弛豫时间分析等方法对王龙庄油田的储层特征进行研究,认为储层的岩石类型以长石砂岩和岩屑长石砂岩为主,原生粒间孔隙是王龙庄油田主要储集空间。油田内部各小断块储层类型差异体现了孔隙结构强非均质性的特点。结合沉积微相、物性以及核磁共振等微观实验,将储层分为3类,其中阜二段三亚段滩坝砂体对应A类孔隙结构,属物性较好的A类储层,该类储层是王龙庄油田的优质储层,该认识对指导王龙庄油田的调整开发具有现实意义。

Nuclear magnetic resonance（NMR）technology is finding wider and wider application in reservoir classification evaluation,which is of great significance for oilfield development.Based on experimental data of NMR,scanning electron microscopy,heavy mineral,and thin section,this paper studied the reservoir characteristics of Wanglongzhuang oilfield by using methods of point statistics,offcenter cutoff value screening and T2 relaxation time analysis.It has been found that with Feldspar sandstone and lithic feldspar sandstone as the main rock types,intergranular pore serves as the main reservoir space in Wanglongzhuang oilfield.The reservoir type differences of small fault block indicate the pore structure and strong heterogeneity in the oilfield.Combined with microscopic experiments of sedimentary microfacies,physical properties and nuclear magnetic resonance,the reservoir can be divided into three categories.Among them,the F32 formation beach bar sand body,corresponding to the better pore structure of class A,belongs to class A reservoir with better physical property.This type of reservoir is the high quality reservoir of Wanglongzhuang oilfield.The result has practical significance to the development adjustment of Wanglongzhuang oilfield.