济阳坳陷太古界岩浆岩常规测井综合识别

Study on Archaean magmatic rocks in Jiyang depression and its conventional logging recognition

济阳坳陷目前已有数口探井钻探到以太古界岩浆岩为主要储层的油藏,火成岩与变质岩测井储层评价技术面临较大困难。在详细调研济阳坳陷太古界岩浆岩体发育地质特征的基础上,通过分析不同岩性测井响应特征,总结了岩浆岩的测井响应模式,建立了相关的交会图技术、曲线叠置技术和基于统计分析的Fisher判别定量识别方法,形成了太古界岩浆岩常规测井综合识别方法。该技术在郑4-2井岩浆岩岩性识别实验中平均准确率达到了83.9%。该技术系列在完善断陷盆地油气储层测井评价技术的同时,还可以为济阳坳陷太古界下阶段油气勘探开发乃至储量申报提供技术支撑。

The Archaeozoic lithology identification in Jiyang depression is an important part of the Archaeozoic reservoir evaluation and it is difficult to use logging technique to evaluate the igneous and metamorphic reservoirs.Based on detailed research on geologic characteristics of the Archaeozoic magmatic rocks in Jiyang depression,this paper analyses well-logging response characteristics of different lithology,summarizes well-logging response models of various lithology,establishes cross-plot technique,curve overlay technology and the Fisher discrimination method based on statistical analysis,and forms the comprehensive well-logging identification methods on the Archaeozoic magmatic rocks.The accuracy of this method can reach more than 80% in practical application.The method can ameliorate the logging technique for reservoir evaluation in rifted basins and can offer technical support for Archean exploration and reserves report in Jiyang depression in the next stage.