评价低渗透率砂泥岩岩心渗透性的方法研究  

Method for Permeability Evaluation of Sand-shale Cores with Low Permeability

作　　者：吴都[1] 张超谟[1] 王英伟[1] 严伟[2] 

机构地区：[1]油气资源与勘探技术教育部重点实验室(长江大学)长江大学地球物理与石油资源学院,湖北荆州434023 [2]中国石化勘探南方分公司,四川成都610041

出　　处：《石油天然气学报》2012年第2期80-83,167,共4页Journal of Oil and Gas Technology

基　　金：国家科技重大专项(2011ZX05020-008)

摘　　要：提出了利用核磁谱评价岩心渗透率的方法,根据核磁共振理论研究了低渗透岩心核磁共振谱特征,分析了岩心在离心前后T2(横向弛豫时间)谱差异原因。利用岩心离心前后T2谱的差异建立新的模型分析岩心的渗透性,将分析结果与Coates模型和SDR模型计算结果进行对比,新模型计算结果在渗透率较低时与岩心分析结果的符合度最高,说明该方法可以为利用岩心核磁谱预测岩心渗透率提供依据。A new method was proposed to evaluate the core permeability by using the Nuclear Magnetic Resonance(NMR) spectrum.According to the theory of NMR,the NMR spectrum distribution characteristics of the tight rock samples and the differences of T2(Transverse relaxation time) spectrum were studied and analyzed,the difference of T2 spectrum of cores both before and after centrifugal was used to establish a new model to analyze the core permeability.The result is compared with those of Coates and SDR models.And at lower permeability the result of the new model is highly consistent with that of core analysis,it indicates that the new method can provide a basis for core permeability prediction in tight rocks by NMR spectrum.

关 键 词：渗透率 核磁共振 T2谱分布 岩心分析 

分 类 号：P618.13[天文地球—矿床学]