时移地震监测水驱前沿的方法和应用研究

油藏开发过程的有效监测是合理开采油藏和提高采收率的关键之一.本文根据水驱油藏流体变化的基本规律以及其他实验和统计结果，讨论了长期注水开采油藏储层物性变化及其引起的弹性参数变化和地震响应变化特征，明确了水驱前沿的概念，提出了基于差异振幅和奇异值分析的时移地震监测水驱前沿方法.理论模型研究表明该方法是可行的.通过对东部地区某油田的两次三维地震数据处理、分析，确定了水驱前沿的位置，后钻的两口井证实了预测结果的准确性和方法的有效性.研究结果还表明，通过水驱前沿的监测并结合初期油藏描述的结果，时移地震可以很好地预测长期水驱油藏剩余油的分布.

A study of the method for time-lapse seismic monitoring of waterflooding front and its application

Monitoring recovery processes is one of the keys to optimize reservoir management and improve production efficiency.Waterflooding causes the changes of reservoir properties(such as pressure,saturation,porosity etc.) and then the changes of reservoir elastic parameters.Based on the law of fluid movement and by analyzing the changes,we discussed the characteristics of seismic response of waterflooding reservoir by forward modeling and gave a definition of waterflooding front.A method based on differential amplitude and singularity value analysis was presented to monitor the front from time-lapse seismic.The method has been tested successfully by a synthetic example and field data from eastern China.The two latter drillings confirmed that the prediction of waterflooding front is accurate.The results also indicated that the distribution of residual oil could be predicted effectively from time-lapse seismic by monitoring the waterflooding front and integrating the initial reservoir characterization.