Comparison of lithological classification using PP and PP-PS results for Midland Basin

PreviousNext No AccessFirst International Meeting for Applied Geoscience & Energy Expanded AbstractsComparison of lithological classification using PP and PP-PS results for Midland BasinAuthors: Sagnik DasguptaEdan GoferSagnik DasguptaSchlumbergerSearch for more papers by this author and Edan GoferSchlumbergerSearch for more papers by this authorhttps://doi.org/10.1190/segam2021-3583117.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractProduction from wells in kerogen-rich shales shows considerable lateral heterogeneity. Reliable pre-drill methods are required to characterize the lateral heterogeneity for the purpose of optimizing the trajectory of lateral wells. Petrophysical interpretation of measured well logs provides information on minerals, porosity, and kerogen content at well location. Combining the results of petrophysical analysis with P-wave, S-wave, and density logs allows generation of probability density functions (PDF) for each of the different significant lithofacies. The PDFs are applied to the P- and S-impedance from Pp prestack amplitude versus angle (AVA) inversion and Pp-Ps prestack AVA inversion to predict the spatial variation in the distribution of lithofacies and associated probability for the Clearfork to Strawn Formation in an area covered by a 3D seismic survey in the Midland Basin, West Texas. Moreover, it has been demonstrated that joint inversion of elastic parameters and lithology relaxes the seismic inversion dependency on the low-frequency model prior. Compared to Pp prestack AVA inversion, joint Pp-Ps prestack inversion can provide a more accurate estimate of VP/VS ratio and density. This may enable a better estimation of the rock facies. Herein, we present comparing results litho-classification, between elastic parameters input from Pp and joint Pp-Ps AVA inversions from the Midland Basin, in West Texas.Keywords: AVO/AVA, reservoir characterization, lithology, rock physics, unconventionalPermalink: https://doi.org/10.1190/segam2021-3583117.1FiguresReferencesRelatedDetails First International Meeting for Applied Geoscience & Energy Expanded AbstractsISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2021 Pages: 3561 publication data© 2021 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 01 Sep 2021 CITATION INFORMATION Sagnik Dasgupta and Edan Gofer, (2021), "Comparison of lithological classification using PP and PP-PS results for Midland Basin," SEG Technical Program Expanded Abstracts : 2104-2108. https://doi.org/10.1190/segam2021-3583117.1 Plain-Language Summary KeywordsAVO/AVAreservoir characterizationlithologyrock physicsunconventionalPDF DownloadLoading ...