测井技术2017，Vol.41Issue(4)：405-411,7.
基于核磁共振T2谱集中度的低孔隙度低渗透率储层饱和度参数研究
Key Parameters of Water Saturation Based on Concentration of T2 Spectrum Distribution
丁娱娇 1柴细元 1邵维志 1李俊国 2韩艳 3李庆合1
作者信息
- 1. 中国石油渤海钻探工程有限公司测井分公司,天津 300280
- 2. 大港油田分公司勘探开发 研究院,天津 300280
- 3. 大港油田分公司第二采油厂,天津 300280
- 折叠
摘要
Abstract
The most critical factor for carrying out the quantity evaluation of the oil saturation is the rock-electro parameters:m and n.The traditional method to get the parameters of m and n is to use the relationship between formation factors and porosity and the relationship between water saturation and resistivity increasing ratio index to obtain the average value of parameter m and n in the region by carrying out experiments, which can meet the demand of the quantity oil saturation evaluation for the conventional homogeneous reservoir with good porosity.Unfortunately, the mid to deep formations in the Qikou sag are of low porosity and low permeability, due to the complexity of deposition system and diagenesis, the pore space structure becomes more complex and the formation inhomogeneity becomes stronger, so there are obvious differences between the parameters m and n from different core samples experiments, the parameter m ranges from 1 to 2 and n from 1 to 6, the average values of m and n in the region are not suitable for oil saturation evaluation of low porosity and low permeability reservoirs.According to the rock-electro parameters from the comprehensive analysis of 300 core samples, it can be found that the values of m and n are affected by porosity, formation water resistivity and pore space structure characteristics.An idea which is based on the concentration of NMR T2 spectrum distribution to show the microscopic pore space structure is provided.In terms of the ranges of the water resistivity, the interpretation models of the key parameters m and n are built in terms of the concentration of NMR T2 spectrum distribution, the parameters m and n which reflects the reservoir porosity and permeability of the reservoirs can be obtained continuously with depth.This method can effectively raise the accuracy of m and n, the relative error m drops to 2.1%, n to 7.23%.The researches have been put into practice and achieved good results.关键词
岩石物理实验/饱和度/低孔隙度/低渗透率/岩电参数/孔隙结构/核磁共振/T2谱集中度Key words
petrophyscial experiment/saturation/low porosity/low permeability/rock-electro parameters/pore structure/NMR/concentration of T2 spectrum distribution分类
天文与地球科学引用本文复制引用
丁娱娇,柴细元,邵维志,李俊国,韩艳,李庆合..基于核磁共振T2谱集中度的低孔隙度低渗透率储层饱和度参数研究[J].测井技术,2017,41(4):405-411,7.
