| 盆地深层火山岩位场分离与边界识别方法概述 |
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| 关键词:basin deep volcanic rocks gravity and magnetic anomalies interpolation cutting method wavelet multiscale decomposition tilt derivative |
| 基金项目:国家重点研发计划(编号: 2017YFC0601204-04) |
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| 摘要: |
| A Review of Potential Field Separation and Boundary Identification Methods of Basin Deep Volcanic Rocks |
| Currently, deep volcanic rocks in the basin have become a hot field for oil and gas exploration. It is crucial for volcanic oil and gas exploration to obtain the gravity and magnetic anomalies caused by volcanic rocks and their distribution through potential field separation and boundary identification. In this review, all types of potential field separation methods are first classified into two categories based on their separation ability: dichotomous and multi-division methods. The origin, development, and current situation of multi-division potential field methods, capable of extracting gravity and magnetic anomalies of basin deep volcanic rocks, are discussed in detail. Consequently, the matched filtering method does not have the desired effect of potential separation due to probable spectral overlap among different field sources in the vertical direction. The wavelet analysis method can effectively separate the potential field of field sources with different buried depths and determine their depths using wavelet multiscale decomposition and power spectrum analysis. The interpolation cutting method can realize the stratified separation of potential fields with specific geological significance due to the equivalent relationship between the cutting radius and the central depth of the abnormal body. Therefore, wavelet multiscale analysis and interpolation cutting methods are more effective for potential field separation than matched filtering. Second, boundary detection methods for local anomalies were classified and compared. Direct derivative calculation methods are considered effective in determining the boundary of shallow field sources but are not sensitive to those of deep field sources. Derivative ratio calculation methods can normalize anomalies caused by deep and shallow field sources to the same level, facilitating accurate boundary identification for both deep and shallow field sources. Therefore, derivative ratio calculation methods are preferred for detecting deep volcanic rock boundaries in basins. Additionally, the influences of the analytic singularity of derivative ratio calculation methods and the noise introduced in derivative calculation on the accuracy of boundary recognition and solutions are discussed. |
| ZHOU Yaoming,SHAO Xinglai,WANG Jianqiang,ZHU Guang.2024.A Review of Potential Field Separation and Boundary Identification Methods of Basin Deep Volcanic Rocks[J].Acta Geoscientica Sinica,45(6):1043-1058. |
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