基于随钻核磁测井的渗透率评价方法及其应用——以渤海锦州油田古近系沙河街组为例  

A permeability evaluation method based on NMR logging while drilling and its application:Taking Paleogene Shahejie Formation in Jinzhou oilfield of Bohai sea as an example

作　　者：郑炀 徐锦绣 刘欢 熊镭 赵书铮 ZHENG Yang;XU Jinxiu;LIU Huan;XIONG Lei;ZHAO Shuzheng(CNOOC China Limited,Tianjin Branch,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《中国海上油气》2019年第2期69-75,共7页China Offshore Oil and Gas

基　　金："十三五"国家科技重大专项"海上稠油高效开发示范工程(编号:2016ZX05058-001)";中海石油(中国)有限公司综合科研项目"渤海油田3000万吨持续稳产关键技术研究(编号:CNOOC-KJ135-ZDXM36-TJ-03)"部分研究成果

摘　　要：渤海锦州油田古近系沙河街组储层孔隙结构比较复杂,应用常规方法评价渗透率精度较低,而核磁共振是孔隙结构评价最直观有效的测井方法。基于物性、压汞、核磁等资料,将锦州油田沙河街组储层的孔隙结构分为双峰大孔喉型、双峰小孔喉型和单峰小孔喉型等3类,分别对每类储层采用分段幂函数的转换方法,由核磁共振T_2谱构建伪毛管压力曲线。通过对岩心物性、压汞等资料的分析,建立了Swanson、R_(10)、R_(35)等孔隙结构参数与岩心渗透率的关系模型。通过对锦州油田沙河街组实际井资料的处理,获取了地层连续的毛管压力曲线,并提取了地层的孔隙结构参数,进而评价了储层的渗透率。应用效果表明,本文提出的基于孔隙结构参数的渗透率评价模型大大提高了渗透率的解释精度,同时验证了本文方法的适用性和准确性。The reservoir pore structures of the Paleogene Shahejie Formation in the Jinzhou oilfield of Bohai sea are relatively complex,and the conventional method renders a low accuracy in permeability evaluation,while the nuclear magnetic resonance(NMR)is the most intuitive and effective logging method for pore structure evaluation.Based on physical properties,mercury intrusion,nuclear magnetic data,etc.,the reservoir pore structures of the Shahejie Formation in Jinzhou oilfield were divided into three types,namely the bimodal large pore throat type,bimodal small pore throat type and unimodal small pore throat type,respectively.The partial power function transformation method was used in each type of reservoir to construct a pseudo-capillary pressure curve with the nuclear magnetic resonance T 2 spectrum.Based on the analysis of core properties,mercury intrusion,etc.,the relationship models between pore structure parameters and core permeability of Swanson,R 10 and R 35 were established.Through processing the actual well data of the Shahejie Formation in Jinzhou oilfield,the continuous capillary pressure curve of the formation was obtained,the pore structure parameters of the formation were extracted,and the reservoir permeability was further evaluated.The application results show that the permeability evaluation model based on pore structure parameters proposed in this paper has greatly improved the interpretation accuracy of permeability,which verifies the applicability and accuracy of the proposed method.

关 键 词：渗透率评价 核磁共振 毛管压力曲线 储层分类 孔隙结构 渤海锦州油田 

分 类 号：TE132.1[石油与天然气工程—油气勘探]