关键词: 时移地震, AVO反演, 岩石物理模型, 正演模拟, 储层, 定量解释

Abstract: The information of amplitude varied with offset (AVO) in pre-stack time-lapse seismic data is much valuable to discriminate variation of different reservoir parameters and to realize quantitative interpretation of reservoir. The petrophysical model for unconsolidated sand rock was determined on the analysis of reservoir conditions. According to the petrophysical model,the time-lapse seismic AVO responses were simulated with the variation of oil saturation and effective pressure by Zoeppritz equation. The feasibility of discriminating different reservoir parameters for realizing quantitative interpretation of reservoir using time-lapse seismic AVO technique was analyzed. Based on the simplified AVO equation given by Aki and Richards,the formula for time-lapse seismic AVO inversion by using the petrophysical model was derived in detail. The simulated data show that the time-lapse seismic AVO inversion is feasible. The formula derived in this paper is effective for discriminating the variations of oil saturation and effective pressure and for improving the precision of time-lapse seismic interpretation.

Key words: time-lapse seismic, amplitude varied with offset inversion, petrophysical model, forward model, reservoir, quantitative interpretation