油藏四维地震窗口声阻抗成像方法研究

Four-dimensional seismic is a newly developed geophysical prospecting frontal technique. It uses time-lapse different seismic attributes to describe the change of fluid in reservoir and monitor reservoir. Acoustic impedance is an important attribute for describing reservoir. In this research, based on acoustic impedance model in acoustic wave equation, a time-segment method combining with the injection method is put forward for the time-lapse seismic forward modeling. Using above method, time-lapse seismic data are modeling theoretically. A windowed reservoir acoustic impedance inversion method for four-dimensional seismic data is developed. The resolution of imaging for four-dimensional seismic data is high with this method. It is first time for the method to process and image real time-lapse seismic data in China. And an applicable process software is designed for time-lapse seismic data. The results of this research push forward enlargement and development for the four-dimensional seismic inversion theory. It has very important significant for reservoir prediction, monitoring and new oil finding in old oilfield.

以四维地震振幅为基础, 声波方程为正反演模型, 多重网格结合油藏窗口扫描成像对油藏内流体变化引起的时延地震数据进行声阻抗反演的高分辨率快速成像方法研究。最终研究制出用于解释油藏油气水变化, 剩余油分布的声阻抗成像软件。其研究对四维地震反演理论的丰富和发展有重要的推动作用，必将极大地提高油气勘探水平，具有广泛的应用前景。.