测井资料交会图法在火山岩岩性识别中的应用

Application of Crossplots Based on Well Log Data in Identifying Volcanic Lithology

在火山岩储层研究中 ,岩性识别显得越来越重要。在评述目前常用的岩性识别方法后 ,重点以测井资料交会图法为例 ,以松辽盆地徐家围子断陷升平气田深层白垩系营城组火山岩为对象 ,优选出密度测井、自然伽玛测井、声波测井、电阻率、钍铀等测井项目的数据进行交会 ,编制出测井曲线交会图版 ,并以此为依据识别出该区的火山岩主要岩性有 :安山岩、玄武岩、流纹岩和凝灰岩等。识别结果与实际情况相吻合。

Lithologyical identification is becoming increasingly important in the study of volcanic rock reservoirs. Common methods in identifying volcanic lithology are introduced briefly here. The volcanic rocks of Yingcheng Formation in Shengping Gas Field are used as examples and well log crossplots are compiled based on the following data: density log, gamma--ray log, acoustic log, resistivity log, thorium and uranium log. By this means, andesite, basalt, rhyolite and tuff are identified. The identification result is well coincident with the lithological fact in the area.