摘要
利用核磁共振技术测量渗透率常用Coates模型，对不含油岩样、含油量低或者含轻质原油的岩样测量比较准确。但大量实验表明用该模型测量含油饱和度高、原油密度大的岩样却存在较大误差，岩样中含油饱和度越高且原油密度越大，对核磁测量渗透率影响也就越大。针对高含油高密度原油岩样核磁共振测量渗透率存在的问题，引入了原油修正系数，并对Coates模型进行了改进，得到了比较准确的核磁共振渗透率值。通过对115块不同地区含有不同性质原油的岩样进行核磁共振测量，与常规气测渗透率比较，发现平均误差在0．3个数量级以内，核磁共振测量渗透率精度得到了较大提高。
Coates model is commonly used for measuring permeability with NMR, and the measurements of non- oil-bearing, low oil-bearing or light oil-bearing rock samples are accurate. However, the experiments show that the noticeable measurement error can occur for the rock samples with high oil saturation and density. The higher the oil saturation and density of rock samples are, the larger the influence of NMR measurement on permeability will be. In view of the problems that NMR has in the permeability measurement of rock samples with high oil saturation and density, the oil correction coefficient is introduced, and Coates model is improved to obtain the more accurate NMR permeability value. Through the contrast of NMR permeability measurement of 115 rock samples from different areas with different oils to the conventionally observed permeability, it is found that the average error is within 0. 3 magnitude order. The accuracy of measuring permeability with NMR is greatly improved.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2011年第6期117-121,共5页
Petroleum Geology & Oilfield Development in Daqing
基金
中国石油天然气股份有限公司基础研究项目“油层物理与物理化学渗流基础研究”（2008A1402）.
