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Integrated Fracture Detection Based on Full-azimuth Anisotropic Migration - A Case Study of Ha7 Area, Tarim Basin
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 76th EAGE Conference and Exhibition 2014, Jun 2014, Volume 2014, p.1 - 5
Abstract
Large amount of fractured carbonate reservoirs are developed in Ha7 area, Tarim Basin. At present, azimuth-sectored migration is routinely used to analyze velocity and output azimuthal CRP gathers. But it cannot resolve reliable azimuthal anisotropy in both velocity and amplitude. Different from this conventional method, we employ an amplitude-preserved full-azimuth anisotropic migration algorithm in this paper for better fracture characterization. Based on iterative NMOz analysis, anisotropic parameters required by anisotropic migration are finally established. More importantly, both a kinematic and a dynamic fracture prediction result are obtained and integrated for comprehensive fracture interpretation, in which the former is derived during the NMOz process while the later is obtained by performing AVAz inversion over the amplitude-preserved azimuthal CRP gathers from full-azimuth anisotropic migration. Resultantly, fracture detection results with our method well agree with the FMI data, and the predicted strike reaches 86% compared with 57% from conventional method. All of these results suggest a more accurate and reliable fracture detection method in comparison with traditional method based on azimuth-sectored migration.