Predicting of Permeable Fracture From Full-Azimuth Seismic Data Using AVAZ / FAVAZ Analysis

The report presents the technology and results of applying full - azimuth seismic data processing in a local angle domain for studying of permeable fracture based on the joint use of AVAZ / FAVAZ analysis. Traditional AVAZ analysis provides information on the effects of HTI anisotropy associated with total fracturing (closed, permeable cracks), including their azimuthal direction. FAVAZ analysis provides information on the frequency variations in the spectrum of the reflected signals depending on the azimuthal direction associated with frequency absorption effects that occur in reservoirs with permeable fluid-saturated fracture. The report presents the process of sharing full-azimuth treatment in the local angle domain and AVAZ / FAVAZ analysis to highlight zones of permeable fracture, which was successfully used to predict carbonate reservoirs in one of the oil fields in the CIS. It is shown that using AVAZ / FAVAZ analysis, it is possible to predict zones of permeable (and, as a rule, oil-saturated) fracture. This improves the reliability of predicting the zones of oil-saturated fracture propagation compared to AVAZ analysis, which registers the common effects of HTI anisotropy. The effectiveness of the use of the results of AVAZ / FAVAZ analysis with the integrated interpretation of the results together with the seismic image of the structural-tectonic framework (SI-STK) is also shown.