Abstract
Low frequency content of seismic signals contains information related to the reservoir fluid mobility. Based on the asymptotic analysis theory of frequency-dependent reflectivity from a fluid-saturated poroelastic medium, we derive the computational implementation of reservoir fluid mobility and present the determination of optimal frequency in the implementation. We then calculate the reservoir fluid mobility using the optimal frequency instantaneous spectra at the low-frequency end of the seismic spectrum. The methodology is applied to synthetic seismic data from a permeable gas-bearing reservoir model and real land and marine seismic data. The results demonstrate that the fluid mobility shows excellent quality in imaging the gas reservoirs. It is feasible to detect the location and spatial distribution of gas reservoirs and reduce the non-uniqueness and uncertainty in fluid identification.
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This work was supported by the National Natural Science Foundation of China (No. 41004054), the National Science and Technology Major Project of the Ministry of Science and Technology of China (No. 2011ZX05023-005-010), the Research Fund for the Doctoral Program of Higher Education of China (No. 20105122120002).
Chen Xue-Hua: See biography and photo in the Applied Geophysics March 2012 issue, P. 72
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Chen, XH., He, ZH., Zhu, SX. et al. Seismic low-frequency-based calculation of reservoir fluid mobility and its applications. Appl. Geophys. 9, 326–332 (2012). https://doi.org/10.1007/s11770-012-0340-6
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DOI: https://doi.org/10.1007/s11770-012-0340-6