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Reassigned Continuous Wavelet Transform and its Application in Hydrocarbon Detection of Complex Structural-Lithologic ReservoirNormal access

Authors: S. Zhang, Z. Zhang, J. Sun and G. Liu
Event name: 81st EAGE Conference and Exhibition 2019
Session: Integrated Subsurface Studies – Seismic Reservoir Characterization I
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201901300
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 526.86Kb )
Price: € 20

Summary:
Continuous wavelet transform (CWT) as a seismic time-frequency analysis technique with multi-resolution characteristics has been widely used in seismic interpretation, such as hydrocarbon detection. With the increased degree of oil and gas exploration, exploration targets are gradually shifting to the complex oil and gas reservoirs such as lithologic and structural-lithologic reservoirs. In this case, CWT method has become increasingly unable to meet the accuracy and resolution requirements of the hydrocarbon detection due to Heisenberg uncertainty principle. Therefore, we study an improved CWT based on reassignment method. The basic idea of this method is to reassign the time-frequency energy of each point in a CWT spectrum to a new coordinate nearer to the actual time-frequency location. Via this process, the reassigned spectrum is much more concentrated than the CWT spectrum and becomes a sparse representation of the signal. The synthetic data and field data processing results show that the high-resolution spectrum decomposition method based on the reassigned continuous wavelet transform (RCWT) can more accurately depict the time-frequency characteristics of the signal, and can well meet the accuracy and resolution requirements of hydrocarbon detection of complex structural-lithologic reservoir.


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