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- W3115602489 abstract "Next No AccessSEG 2020 Workshop: 2nd SEG Borehole Geophysics Workshop, Virtual, 26–27 November 2020Evaluation of gas saturation in unconventional resources based on full-waveform sonic attenuationAuthors: Qiaomu QiLi-Yun FuJixin DengJunxin CaoQiaomu QiChengdu University of TechnologySearch for more papers by this author, Li-Yun FuChina University of Petroleum (East China)Search for more papers by this author, Jixin DengChengdu University of TechnologySearch for more papers by this author, and Junxin CaoChengdu University of TechnologySearch for more papers by this authorhttps://doi.org/10.1190/bhgp2020-01.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Two effective methods are presented in this work for computing gas saturation in organic-rich shale and tight gas formations from full-waveform sonic attenuation. The P- and S-wave attenuations are extracted from monopole and dipole waveforms by median-frequency shift and multi-frequency inversion methods, respectively. Crossplot of the P-to-S wave attenuation ratio (Qp−1/Qs−1) and core gas saturation shows a positive linear correlation. The Qp−1/Qs−1 ratio and neutron-density porosity difference exhibit identical log trends across different formations. The coincidence of the two different hydrocarbon indicators indicates that the Qp−1/Qs−1 ratio is most sensitive to pore-fluid saturation and less affected by variations in lithology. In this case, we demonstrate that the core-calibrated Qp−1/Qs−1 ratio yields an accurate estimate of gas saturation. In the absence of core saturation data, we employ the probability distribution of Qp−1/Qs−1 ratios for the evaluation of gas saturation. Compared to conventional resistivity methods, the proposed attenuation method, as a non-electric approach, provides more accurate gas saturation prediction for low-resistivity reservoir rocks. Keywords: attenuation, sonic, porosity, permeability, gasPermalink: https://doi.org/10.1190/bhgp2020-01.1FiguresReferencesRelatedDetails SEG 2020 Workshop: 2nd SEG Borehole Geophysics Workshop, Virtual, 26–27 November 2020ISSN (online):2159-6832Copyright: 2020 Pages: 167 publication data© 2020 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 30 Dec 2020 CITATION INFORMATION Qiaomu Qi, Li-Yun Fu, Jixin Deng, and Junxin Cao, (2020), Evaluation of gas saturation in unconventional resources based on full-waveform sonic attenuation, SEG Global Meeting Abstracts : 1-3. https://doi.org/10.1190/bhgp2020-01.1 Plain-Language Summary KeywordsattenuationsonicporositypermeabilitygasPDF DownloadLoading ..." @default.
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- W3115602489 title "Evaluation of gas saturation in unconventional resources based on full-waveform sonic attenuation" @default.
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