摘要
碳酸盐岩地层中存在由基质孔隙和次生孔隙组成的双孔隙结构,次生孔隙是油气的主要储集空间和运输通道,准确计算次生孔隙度值有利于储层有效性评价。利用高斯函数拟合法、Newberry方法和判别式截止值选择法计算了电成像测井孔隙度谱的截止值,并利用截止值计算了储层的次生孔隙度。发现在碳酸盐岩地层中次生孔隙度高的储层对油气产量的贡献大于次生孔隙度低的储层对油气产量的贡献。3种方法在稳定性和准确性上存在较大的差异。稳定性方面,Newberry方法和判别式截止值选择法的稳定性要好于高斯函数拟合法;准确性方面,高斯函数拟合法的准确性要高于Newberry方法和判别式截止值选择法。
Many carbonate reservoirs have dual porosity systems with primary and secondary porosity.The secondary porosity is the main reserving space and transport channel for hydrocarbon.Then,exact calculation of secondary porosity is valuable for evaluating reservoir effectiveness.We calculate a porosity spectrum threshold of electrical images by Gauss-Method,Newberry-Method and Discriminant-Method,and then,calculate the secondary porosity of the reservoirs using the threshold.Good production has been obtained from reservoirs showing higher secondary porosity whereas zones having lower secondary porosity have poor production.Stability and accuracy of the three methods are different.As for stability,the Newberry-Method and the Discriminant-Method are better than the Gauss-Method;as for accuracy,the GaussMethod is better than the Newberry-Method and the Discriminant-Method.
出处
《测井技术》
CAS
CSCD
2016年第1期60-64,共5页
Well Logging Technology
关键词
岩石物理方法
碳酸盐岩
电成像测井
孔隙度谱
截止值
petrophysical method
carbonate reservoir
electrical image logging
porosity spectrum
threshold
