渤海湾盆地东营凹陷古近系细粒沉积岩岩相类型及判别

发布时间：2018-06-17 08:49

本文选题：细粒沉积岩 + 岩相划分　；参考：《天然气地球科学》2017年05期

【摘要】：东营凹陷古近系沙河街组沙三下—沙四上亚段是细粒沉积岩发育的主力层段,岩相类型多样。通过岩心观察、薄片、X-射线衍射分析,对东营凹陷古近系细粒沉积岩进行岩相类型划分;选取GR、CNL、AC等测井曲线建立岩相测井识别模式;应用判别分析对不同类型细粒沉积岩进行区分。结果表明:古近系沙河街组沙三下—沙四上亚段细粒沉积岩碳酸盐矿物含量高,共发育灰岩类、泥岩类、粉砂岩类、混合细粒沉积岩类四大岩相类型,根据矿物成分、构造以及有机质含量差异可进一步划分为含有机质块状灰岩、富有机质纹层状粉砂质泥岩、富有机质层状泥质粉砂岩、富有机质层状泥质灰岩等亚类;各岩相具有不同的岩相识别模式;利用判别分析,可有效区分不同类型细粒沉积岩。该方法为缺少取心资料井段的细粒沉积岩的岩相识别、预测以及细粒沉积岩储层的评价和可改造性研究提供一定的基础。
[Abstract]:The Upper Shahejie formation of the Paleogene Shahejie formation in Dongying Sag is the main formation of fine-grained sedimentary rocks with various lithofacies types. Through core observation, thin slice X ray diffraction analysis, lithofacies classification of Paleogene fine sedimentary rocks in Dongying sag is carried out, and lithofacies logging identification model is established by selecting GRG CNLX AC logging curve. Discriminant analysis is used to distinguish different types of fine sedimentary rocks. The results show that the fine sedimentary rocks of Shahejie formation of Paleogene have high carbonate mineral content, and there are four major lithofacies types: limestone, mudstone, siltstone and mixed fine sedimentary rock, according to the mineral composition. The structure and organic matter content difference can be further divided into organic matter bearing block limestone, organic matter rich grain stratiform silty mudstone, organic matter layer argillaceous siltstone, organic matter layer argillaceous limestone and so on. Each lithofacies has different lithofacies recognition models, and discriminant analysis can effectively distinguish different types of fine sedimentary rocks. This method provides a basis for the lithofacies identification and prediction of fine sedimentary rocks in the well section lacking coring data, as well as the evaluation of fine sedimentary rock reservoirs and the study of their revamability.
【作者单位】：中国石油大学(华东)地球科学与技术学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;中国石化胜利油田分公司地质科学研究院;
【基金】：国家科技重大专项“深层油气、非常规天然气成藏规律与有利勘探区评价技术”(编号:2017ZX05008-004);国家科技重大专项“东濮凹陷油气富集规律与增储领域”(编号:2016ZX05006-004)联合资助
【分类号】：P618.13

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