Abstract
Reservoir prediction is often a primary objective in seismic exploration, especially for deep hydrocarbon detection with its potential for assessing oil and gas resources. Time–frequency analysis has become a successful method for detecting subsurface features and can also be used to identify potential hydrocarbon reservoirs. However, current applications for hydrocarbon detection often occur at low resolution, due to the influence of the windowing functions and lack of prior constraints, thereby affecting gas prediction for thin reservoirs. To rectify this issue, we investigate the use of sparse inverse spectral decomposition (SISD) based on the wavelet transform, which adopts an lp norm to constrain the time–frequency spectra, and thereby provides a more highly concentrated time–frequency representation than conventional spectral decomposition techniques. The main objective of this paper is to investigate the performance of spectral attributes derived from lp-norm constrained SISD and its application to the characterization of deep-marine dolomite reservoirs in southwest China. The gas-bearing zones in target reservoir are predicted well by extracting and analyzing the spectral amplitude responses of different frequency components. The predicted favorable gas-bearing areas are closely related to local structures in the target reservoir, which are also in good agreement with gas-testing results at three well locations and may be used to guide subsequent exploration well development in this region.
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Acknowledgements
We thank J. Gao and S. Li for valuable help with the field data. This work was financially supported by the National Key R&D Program of China (2018YFA0702504), the National Natural Science Foundation of China (41974140), the Major Scientific Research Program of Petrochina Science and Technology Management Department “Comprehensive Seismic Prediction Technology and Software Development of Natural Gas” (2019B-0607), the Scientific Research & Technology Development Project of China National Petroleum Corporation (2017D-3504), the National Science and Technology Major Project (2017ZX05005-004), and the Fundamental Research Funds for the Central Universities (2462019QNXZ03).
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Wang, T., Yuan, S., Wang, R. et al. Gas Reservoir Characterization Using Lp-Norm Constrained High-Resolution Seismic Spectral Attributes. Pure Appl. Geophys. 177, 5417–5433 (2020). https://doi.org/10.1007/s00024-020-02585-y
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DOI: https://doi.org/10.1007/s00024-020-02585-y