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Main Geological Factors Affecting Frequency-Dependent AVO
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 81st EAGE Conference and Exhibition 2019, Jun 2019, Volume 2019, p.1 - 5
Abstract
AVOF inversion method theoretically has strong effectiveness in fluid recognition. Therefore, we analyzed the connection of 32 production wells in Tarim Basin with P-wave dispersion gradients. However some wells with strong indications are not coincident. For this reason, how to further recognize the geological factors affecting frequency-dependent AVO is the key point. In this paper, the AVOF method is applied on three unconventional reservoirs to comprehensively analyze porosity, saturation and fault affecting AVOF. In order to remove the influence of technical processes and effectively analyze geological factors, we conduct amplitude-reserved and select optimized method and frequency parameters to invert P-wave dispersion. In dissolution caved carbonate reservoir, porosity is the dominant geological factor affecting frequency-dependent AVO compared with saturation. In tight dolomite reservoir, porosity affecting dispersion distinctly compared with permeability. In igneous rock reservoir, fluid saturation affects the degree of dispersion significantly in the case of similar porosity. Moreover, faults play an important factor. In sum, geological factors affecting frequency-dependent AVO is complex, the effect of porosity plays a relatively dominant role in affecting frequency-dependent AVO through comprehensive analysis.