Q estimation on CMP gather based on continuous spectral ratio slope method: A Case study in Ahdeb Oil Field, Iraq

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2018Q estimation on CMP gather based on continuous spectral ratio slope method: A Case study in Ahdeb Oil Field, IraqAuthors: Zongwei WuYijia WuMinghua XuYijia WuZongwei WuGeological Exploration and Development Research Institute of CNPC Chuanqing Drilling Engineering LimitedSearch for more papers by this author, Yijia WuGeological Exploration and Development Research Institute of CNPC Chuanqing Drilling Engineering LimitedSearch for more papers by this author, Minghua XuGeological Exploration and Development Research Institute of CNPC Chuanqing Drilling Engineering LimitedSearch for more papers by this author, and Yijia WuState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum UniversitySearch for more papers by this authorhttps://doi.org/10.1190/segam2018-2995781.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail AbstractThis study proposed an improved method f to calculate Q factor, which is derived from a pre-stack Q inverse method proposed by former researchers based on generalized S transform. Meanwhile, this method specifies a theoretical initial wavelet and calculates cumulative Q factors, then finds inter-laminar Q factors using the relationship between Q and the offset (QVO) and the Dix formula. Since the frequency spectrum of each horizon can be extracted continuously on a 2-D time-frequency spectrum, this method is defined as “CONTINUOUS” spectral ratio slope (CSRS) method. Comparing with the former Q inversion method that calculates inter-laminar Q factors after picking horizons, this method provides convenience for calculation, definitive mathematical and physical meanings, and stability for calculating spectrum ratio. A numerical modeling was demonstrated to verify the feasibility of this method. Also, this method was applied in actual CMP gathers of an oil-field in Ahdeb, Iraq. The result shows that this new method can effectively enhance the resolution of Q section elaborating the absorption ability of strata, reflecting abundant internal information, possessing stable lateral distribution, which provides a reliable basis for lithology prediction and fluid identification.Presentation Date: Tuesday, October 16, 2018Start Time: 8:30:00 AMLocation: 210A (Anaheim Convention Center)Presentation Type: OralKeywords: Q, prestack, spectral analysis, decompositionPermalink: https://doi.org/10.1190/segam2018-2995781.1FiguresReferencesRelatedDetails SEG Technical Program Expanded Abstracts 2018ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2018 Pages: 5520 publication data© 2018 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 27 Aug 2018 CITATION INFORMATION Zongwei Wu, Yijia Wu, Minghua Xu, and Yijia Wu, (2018), "Q estimation on CMP gather based on continuous spectral ratio slope method: A Case study in Ahdeb Oil Field, Iraq," SEG Technical Program Expanded Abstracts : 1544-1548. https://doi.org/10.1190/segam2018-2995781.1 Plain-Language Summary KeywordsQprestackspectral analysisdecompositionPDF DownloadLoading ...