Logging Interpretation of Porosity for Tight Glutenite Based on Principal Component Analysis
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摘要: 岩性识别是致密砂砾岩测井评价的重要工作。砂砾岩岩性多样、成分复杂,导致测井识别岩性准确率低、测井解释孔隙度不准确。以东营凹陷北部陡坡带沙四下亚段致密砂砾岩为例,在对其岩石学特征分析的基础上,按照岩石类型和骨架矿物差异给砂砾岩分类,利用铸体薄片资料对测井曲线进行岩性标定,提取各种岩性的测井响应特征,在此基础上建立了基于主成分分析的测井岩性识别方法,并分岩性建立了孔隙度测井评价模型,提高了砂砾岩测井岩性识别和测井孔隙度计算的准确率。Abstract: Lithology recognition is an important work in log evaluation of tight glutenite. Glutenite is characterized by diverse lithology and complex component. These factors always result in difficulty in lithology recognition and logging interpretation of porosity. In this article, take tight glutenite in the lower part of the 4th member of Shahejie formation in steep-slope zone in north Dongying Sag as an example, based on petrologic characteristics, glutenite was classified according to different rock types and framework minerals. Rock thin sections were used to demarcate lithology in log curve, and log response for different lithology were extracted, then the author established lithology recognition method for tight sandstone based on principal component analysis, and finally established porosity evaluation method based on log curve for different lithology. Practice indicates that application of this method can increase accuracy both in lithology recognition and porosity prediction by a wide margin.
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Key words:
- tight glutenite /
- log evaluation /
- principal component analysis /
- Dongying sag /
- porosity
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