How seismic anisotropy changes with scale
- Dawin Baden (Aix-Marseille Université, CNRS, CEREGE, IRD) | Pierre Henry (Aix-Marseille Université, CNRS, CEREGE, IRD) | Ginette Saracco (Aix-Marseille Université, CNRS, CEREGE, IRD) | Lionel Marié (Aix-Marseille Université, CNRS, CEREGE, IRD) | Alain Tonetto (Aix-Marseille Université, CNRS, CEREGE, IRD) | Yves Guglielmi (Lawrence Berkeley National Laboratory) | Seiji Nakagawa (Lawrence Berkeley National Laboratory) | Gérard Massonnat (Total Exploration & Production) | Jean-Paul Rolando (Total Exploration & Production)
- Document ID
- Society of Exploration Geophysicists
- 2017 SEG International Exposition and Annual Meeting, 24-29 September, Houston, Texas
- Publication Date
- Document Type
- Conference Paper
- 2017. Society of Exploration Geophysicists
- VTI, Anisotropy, Ultrasonic, Carbonate, Reservoir characterization
- 0 in the last 30 days
- 22 since 2007
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Physical properties of carbonate rocks cannot be fully captured from laboratory-sized samples. Indeed, heterogeneous facies distribution and/or diagenetic alterations may lead to significant variations in petrophysical properties within few meters. In carbonates, diagenetic transformations are tightly related to nature of fluids flowing through the formations, e.g. via fractures network. Consequently, reservoir properties may have patchy distribution, and may not be correlatable (e.g. using facies distribution or wells-logs correlations) within few meters. Our works aim at characterizing carbonates anisotropy at different scales, and are subject of two presentations at SEG's 87th Annual Meeting. This abstract deals with the second part of our approach, that's to say characterizing impact of diagenetic alteration on reservoir properties and seismic anisotropy, from centimeter to multi-meter scale. This part of the works integrate data from centimeter-scale (mini-cores), decimeter-scale (5″ cores), multi-meter (ultrasonic crosshole), and hectometer-scale (seismic), which have been measured at suitable frequency ranges (1MHz, 250kHz, 50kHz, and 1–100Hz, respectively). Although anisotropy is measureable at every scales, its origins vary according to scale. In this study, it is shown that matrix of porous samples are weakly anisotropic as a result of inter-crystalline pores. At centimeter-scale, anisotropy can also be related to: (1) patchy distribution of some physical properties, (2) local cracks distribution, and (3) thick single fractures. The lack of correlation between stiffness components from seismic-scale measurements, and laboratory to multi-meter scale ones emphasizes the fact that, when fracturing dominates, measured anisotropy is dominated by fracture/fault related anisotropy and matrix-related anisotropy may be lost. So that, scale effect must be handled carefully in anisotropy analyses, especially for carbonate formations.
This paper has been withdrawn from the Technical Program and will not be presented at the 87th SEG Annual Meeting.
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