煤层气储层密度测井响应特征及扩径影响校正研究

Study on Response Characteristics and Expanding Influence Correction of Density Logging in Coalbed Methane Reservoir

本文对研究区不同煤岩类型的密度测井响应特征和扩径率进行了系统分析,查明了扩径率与密度测井响应特征间的内在关系,得知扩径影响是造成密度测井响应值严重失真的主要原因之一。基于研究区煤岩实测视相对密度、密度测井值和扩径率及泥浆密度资料,采用最小二乘法拟合构建了密度测井扩径影响校正模型,以期实现密度测井资料的扩径影响自动校正处理,进而来提升密度测井在煤层气储层中的应用效果。

The density logging response characteristics and the expanding rate of coal seam are statistically analyzed using statistical method for the study area,the inherent relationships between the expanding rate and density response are found out,and the expanding influence which results in lower density log response values is the main reason.According to the measured apparent relative density,the density logging values and the expanding rate,the model of correction amount and expanding rate,mud density is fit using the least squares method for the research work area.This model can realize the automatic correction processing of hole enlargement effect for density logging data,thus to improve density logging application effect in CBM reservoir.