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• W1972185344 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2007Interaction of seismic background noise with oscillating pore fluids causes spectral modifications of passive seismic measurements at low frequenciesAuthors: Marcel FrehnerStefan M. SchmalholzYuri PodladchikovMarcel FrehnerDepartment of Earth Sciences, ETH ZurichSearch for more papers by this author, Stefan M. SchmalholzDepartment of Earth Sciences, ETH ZurichSearch for more papers by this author, and Yuri PodladchikovPhysics of Geological Processes (PGP), University of OsloSearch for more papers by this authorhttps://doi.org/10.1190/1.2792742 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Studies of passive seismic data in the frequency range below 20Hz have shown that the frequency content of the ever‐present seismic background noise changes above hydrocarbon reservoirs. Different explanations for this observation have been proposed. In this study, the effect of oscillating pore fluids, i.e. oil, on the seismic background noise is investigated. A non‐wetting fluid drop entrapped in a pore can oscillate with a characteristic eigenfrequency. Capillary forces act as the restoring force driving the oscillations. A 1D wave equation is coupled with a linear oscillator equation, which represents these pore fluid oscillations. The resulting linear system of equations is solved numerically with explicit finite differences. The most energetic part of the seismic background noise, i.e. frequencies around 0.1–0.3Hz, is used as the external source. This part is presumably related to seismic surface waves generated by ocean waves. It is shown that the resulting elastic wave initiates oscillations of the fluid drops. The oscillatory energy of the pore fluid is transferred continuously to the elastic rock matrix. In consequence, seismic waves in the elastic rock carry a second frequency, the eigenfrequency of the pore fluid oscillations on top of the applied external frequency. Both frequencies can be measured at the earth surface. The presented model is considered as a possible explanation for observed spectral modifications above hydrocarbon reservoirs. Time evolution of the pore fluid oscillations seems to be related to the thickness of the hydrocarbon reservoir.Permalink: https://doi.org/10.1190/1.2792742FiguresReferencesRelatedDetailsCited byVelocity and attenuation of elastic wave in a developed layer with the initial inner percolation in the pores20 April 2018 | Journal of Petroleum Exploration and Production Technology, Vol. 8, No. 4Low-frequency passive seismic experiments in Abu Dhabi, United Arab Emirates: implications for hydrocarbon detection12 August 2010 | Geophysical Prospecting, Vol. 58, No. 5Oscillating oil drops, resonant frequencies, and low-frequency passive seismologyMichael K. Broadhead20 January 2010 | GEOPHYSICS, Vol. 75, No. 1 SEG Technical Program Expanded Abstracts 2007ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2007 Pages: 3124 publication data© 2007 Copyright © 2007 Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 14 Sep 2007 CITATION INFORMATION Marcel Frehner, Stefan M. Schmalholz, and Yuri Podladchikov, (2007), Interaction of seismic background noise with oscillating pore fluids causes spectral modifications of passive seismic measurements at low frequencies, SEG Technical Program Expanded Abstracts : 1307-1311. https://doi.org/10.1190/1.2792742 Plain-Language Summary PDF DownloadLoading ..." @default.
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