水驱油藏时移地震叠前匹配反演——西非深水扇A油田时移地震研究实例

水驱时移地震研究即是将基础数据与监测数据的地震响应差异翻译为油藏特征的变化。以深水扇油藏水驱开发时移地震研究为例, 本文探讨了应用基于岩石物理研究的地震叠前匹配反演获得水驱开发敏感弹性属性体及其差异体的方法。通过流体替代开展岩石物理分析, 对水驱过程中岩石物理参数的流体敏感性进行排序, 确定匹配反演目标属性; 深入讨论了影响匹配反演效果的子波、约束模型及关键参数等三个主要因素。匹配反演获得的多种水驱流体敏感属性体及其差异体为后续剩余油分布预测及油藏开采部署提供了可靠依据。

Time-lapse seismic matching inversion in water flooding reservoir:a case of deep-water fan in the Oilfield A,West Africa

Time-lapse seismic interprets the difference between base data and monitored data as reservoir change. We have conducted a pre-stack matching inversion on time-lapse seismic data in the Oilfield A, West Africa, a typical deep water fan sand reservoir. The matching inversion based on rock physics obtains water flooding sensitivity cube and elastic attribute cube. By fluid replacement on rock physics analysis, reservoir rock physics parameters are ranked for their fluid sensitivity in water flooding to determine object attributes of the matching inversion. Time-lapse seismic matching inversion is based on the pre-stack seismic inversion. The discussion focuses on wavelet, constraint model, and key parameters of matching inversion. The flooding sensitivity attribute cube and its differences help remaining oil prediction for further oil development.