241 QUAL I TÉ GÉOPHYSIQUEAPPLIQUÉE 8 Seismic anisotropy applied to geothermal prospection R. Baillet, N. Desgoutte, V.Thomas and J. Caudroit Introduction Anisotropy estimation allows to go beyond the lateral resolution of the conventional seismic data (Lui and Martinez, 2012); a full-stack full-azimuth seismic inversion and its associated characterization, as described in the previous chapter, assumes a homogeneous and isotropic medium. The proposed azimuthal approach allows us to overcome this limitation by estimating the key properties for each source/receiver direction. Small heterogeneities, such as smaller fractures, can be detected if the impedance varies from one sector to another, generating an azimuthal anomaly. The anisotropy magnitude and orientation can be extracted for further analysis and linked, if possible, to fracture intensity and orientation (Adelinet et al., 2012). This fracture intensity can have a major impact on the expected flow rate or communication between the reservoirs, and, therefore, is often a key element for decision making. After elaborating briefly the technical background, we will describe the methodology for both VVAZ (Velocity versus Azimuth) and AVAZ (Amplitude versus Azimuth), based on partially stacked seismic according to the azimuth. The software used for the demonstration is InterWell, the software solution from © EDP Sciences, 2025 DOI: https://doi.org/10.1051/978-2-7598-3752-6.c008
RkJQdWJsaXNoZXIy NjA3NzQ=