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| Titel |
Mapping local singularities using magnetic data to investigate the volcanic rocks of the Qikou depression, Dagang oilfield, eastern China |
| VerfasserIn |
G. Chen, Q. Cheng, T. Liu, Y. Yang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 20, no. 4 ; Nr. 20, no. 4 (2013-07-12), S.501-511 |
| Datensatznummer |
250018986
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| Publikation (Nr.) |
 copernicus.org/npg-20-501-2013.pdf |
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| Zusammenfassung |
| The spatial structural characteristics of geological anomaly, including
singularity and self-similarity, can be analysed using fractal or
multifractal modelling. Here we apply the multifractal methods to potential
fields to demonstrate that singularities can characterise geological bodies,
including rock density and magnetic susceptibility. In addition to enhancing
weak gravity and magnetic anomalies with respect to either strong or weak
background levels, the local singularity index (α ≈ 2) can be
used to delineate the edges of geological bodies. Two models were established
to evaluate the effectiveness of mapping singularities for extracting weak
anomalies and delineating edges of buried geological bodies. The Qikou
depression of the Dagang oilfield in eastern China has been chosen as a study
area for demonstrating the extraction of weak anomalies of volcanic rocks,
using the singularity mapping technique to analyse complex magnetic anomalies
caused by complex geological background. The results have shown that the
singularities of magnetic data mapped in the paper are associated with buried
volcanic rocks, which have been verified by both drilling and seismic survey,
and the S–N and E–W faults in the region. The targets delineated for deeply
seated faults and volcanic rocks in the Qikou depression should be further
investigated for the potential application in undiscovered oil and gas reservoirs
exploration. |
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