四维地震勘探技术新进展

从第 6 5届EAGE年会上有关四维地震的论文看 ,四维地震的进展主要表现在三维叠前地震模拟、提高重复性处理以及油藏参数反演等方面。三维叠前地震模拟解决了计算速度慢的问题。在提高重复性处理方面 ,强调了保持方位角的重要性 ,提出用共数据体的概念来解决不同条件下采集的时延数据分析问题。在油藏参数反演方面 ,提出了多种方法来反演储层压力、孔隙度和饱和度变化等。从应用情况看 ,四维地震在Draugen油田的实际生产中取得了很好的效果 ,在油藏管理中发挥了重要的作用 ,取得了良好的经济效益。

Advances in time-lapse seismic technology

The advances in time-lapse seismic were mainly in 3-D prestack seismic simulation, data processing aimed at improvement of repeatability, and inversion of reservoir parameters. The problem of computational efficiency has been solved in certain degree in 3-D prestack seismic simulation. As the data processing aimed at improvement of repeatability as going, high priority in data processing has been given to the preservation of azimuth. The analysis of time-lapse data in various acquisition conditions was proposed to cope with co-cubes. Several methods have been developed to invert the reservoir parameters like pressure, porosity, and saturation. Time-lapse seismic has yielded satisfactory results in the application in Draugen oilfield. It has played important role in reservoir management, and brought forth considerable economic benefits.