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- Title
基于变分模态分解的米兰科维奇旋回划分 厚层砂砾岩地层层序的方法及其应用.
- Authors
丁 恺; 赵福海; 高莲凤; 李丙喜; 高晨阳; 靳雪彬
- Abstract
In the process of sequence subdivision of thick glutenite reservoirs via conventional logging curves, there are problems of unclear boundaries and determination challenge of classification criteria. However, as an important geological event in sedimentary strata, Milankovitch cycle is characterized by relative stability in a long geological history, which makes sequence division constrained by Milankovitch cycles have higher unity. Variational mode decomposition (VMD) method is used for time-frequency analysis of Milankovitch cycles in thick glutenite strata of the fourth member(Ying-4 Member) of Yingcheng Formation in Xujiaweizi Rift of Songliao Basin, and high-frequency components corresponding to Milankovitch astronomical periods are extracted so as to realize sequence division. The results show that, by using VMD method to process logging curves, several characteristics components of GR curve in studied area are obtained by VMD decomposition. The ratios shows 100ka cycle corresponding to IMF1 component. According to IMF1 curve shape and combined with lithology, Ying-4 Member is subdivided into 21 fifth-order sequences, and they are combined into 6 fourth-order sequences. At the boundaries of fourth-order sequences, curve shape has abrupt changes, showing obvious periodic oscillation with large response amplitude. Application of VMD method in Ying-4 Member shows that this method identifies and divides Milankovich cycles with different scales, with high accuracy and repeatability. The research results can be used in high-frequency sequence division of glutenite strata.
- Subjects
MILANKOVITCH cycles; PETROLOGY; RIFTS (Geology); OSCILLATIONS; CONCORD; SUBDIVISION surfaces (Geometry); TIME-frequency analysis
- Publication
Petroleum Geology & Oilfield Development in Daqing, 2023, Vol 42, Issue 6, p17
- ISSN
1000-3754
- Publication type
Article
- DOI
10.19597/J.ISSN.1000-3754.202301005