Reservoir Predictions on Elastic Impedance Inversion Pre-Stack of Walkaway VSP

PreviousNext No AccessRock Physics and Digital Rock Applications Workshop, Beijing, China, 20-22 May 2018Reservoir predictions on elastic impedance inversion pre-stack of Walkaway VSPAuthors: Jianguo LiXiaolu ZhangCe ChenChong WangJianguo LiBGP Inc., CNPCSearch for more papers by this author, Xiaolu ZhangBGP Inc., CNPCSearch for more papers by this author, Ce ChenBGP Inc., CNPCSearch for more papers by this author, and Chong WangBGP Inc., CNPCSearch for more papers by this authorhttps://doi.org/10.1190/DPRP2018-17.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract In recent years, VSP technology has developed rapidly while the Walkaway VSP and 3D VSP have been widely used in oil and gas exploration and development, which is becoming the main reservoir geophysical technology. Generally, the Walkaway VSP and 3D VSP are to be processed, migrated and superimposed to obtain the well side imaging profile and thus construct interpretation, attribute extraction, reservoir prediction and others based on the post-stack imaging. However, the post stack inversion assumes that the seismic wave is perpendicular to the incident which not self-excited actually, while the reflection amplitude is the average of the different incident Angle amplitude of the common reflection point. Therefore, there is an error in post stack inversion with discarded rich lithology related pre-stack information. Based on the Walkaway VSP data of a well in eastern China, this paper focuses on the prediction on the elastic impedance inversion pre-stack of the Walkaway VSP by elastic impedance formula of Whitcombe, and the main technical idea is: using zero-offset VSP to pick up from preliminary longitudinal wave to preliminary transverse wave, and calculate the velocity ratio of horizontal wave and transverse wave velocity ratio to converse the well logging transverse wave speed. In the reservoir section, the elastic impedances of acoustic impedance in different angles are cross analyzed while the sensitive. However, angle of reservoir is identified. The three elastic impedances are obtained respectively through the angle superposition integrated with close range, medium distance and long distance by establishing the inverse model in the deep relationship among the well elastic impedance curve, horizon and longitudinal wave. Combined with three elastic impedances, the lithological parameters related to the reservoir are obtained by taking the logarithm to set up the linear equation. Keywords: inversion, prestack, VSPPermalink: https://doi.org/10.1190/DPRP2018-17.1FiguresReferencesRelatedDetails Rock Physics and Digital Rock Applications Workshop, Beijing, China, 20-22 May 2018ISSN (online):2159-6832Copyright: 2018 Pages: 121 publication data© 2018 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 14 Aug 2018 CITATION INFORMATION Jianguo Li, Xiaolu Zhang, Ce Chen, and Chong Wang, (2018), "Reservoir predictions on elastic impedance inversion pre-stack of Walkaway VSP," SEG Global Meeting Abstracts : 64-68. https://doi.org/10.1190/DPRP2018-17.1 Plain-Language Summary KeywordsinversionprestackVSPPDF DownloadLoading ...