核磁共振τ_2谱评价盐定地区储层孔隙结构方法研究  

A Method to Evaluate Formation Pore Structurum by Using NMR τ_2 Spectra in Yanding Area

作　　者：朱广社[1,2] 邵晓岩[2] 王军[2] 王高强[2] 马宏伟[2] 刘玉峰[2] 

机构地区：[1]成都理工大学沉积地质研究院,四川成都610059 [2]中石油长庆油田分公司第三采油厂,宁夏银川750006

出　　处：《石油天然气学报》2013年第12期102-104,111,共4页Journal of Oil and Gas Technology

摘　　要：储层孔隙结构是评价储层油气含量和油气生产能力的关键,毛细管压力曲线是评价储层孔隙结构最主要的资料之一,但毛细管压力曲线是有限且不连续的,而核磁共振测井可以连续地提供储层孔径分布信息。针对无点对点岩心刻度的核磁共振测量井,采用J函数刻度法建立了利用核磁共振横向弛豫时间(τ2)谱构造伪毛细管压力曲线的方法。利用该方法对盐定地区三叠系延长组9油层组进行了实际处理,构造的伪毛细管压力曲线反映该区地层孔隙结构属于C类储层,主要特征是储层分选好,裂隙均匀细偏度,排驱压力小于1.0MPa,中值压力小于10MPa,最大进汞饱和度70%～90%,与研究区储层孔隙结构特征一致。Formation pore structure was the key to evaluate formation hydrocarbon content and productivity.Capillary pressure was one of the most important data to evaluate formation pore structure,but the capillary pressure curve was limited and discontinuous,while NMR logging could be used to evaluate formation pore structure continuously.Aimed at the NMR logging wells without point to point core graduation,J-function calibration method was used to convert capillary pressure using NMRτ2spectra.The method is used to process the Y9reservoir of Triassic Yangchang Formation in Yanding Area,the converted capillary pressure curve reflects that the pore structure of the area belongs to Type C reservoir.The main characteristics are good sorting,fracture is uniform and fine with displacement pressure less than1.0MPa,median pressure less than 10MPa and maximum mercury saturation of 70%～90%.The result is consistent with the pore structure in the studied area.

关 键 词：储层孔隙结构 毛细管压力曲线 核磁共振τ2谱 J函数刻度法 

分 类 号：P618.13[天文地球—矿床学]