具有外部漂移的克里金方法在绘制构造图中的应用

Application of Kriging-with-an-external-drift in structure mapping

1. 中国石油勘探开发研究院,北京 100083;2. 大庆油田有限责任公司勘探开发研究院,黑龙江大庆 163712;3. 中国地质大学,北京 100083

PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China

介绍了一种有效绘制构造图的方法——具有外部漂移的克里金方法。在二级变量与主变量具有良好相关性的条件下,具有外部漂移的克里金方法能够简单有效地利用二级变量信息来估计主变量。地震旅行时与对应层位井深度数据的相关性、地震同相轴的连续性和地震数据的区域性,使得可以应用具有外部漂移的克里金方法来进行时深转换,绘制构造图。研究表明,具有外部漂移的克里金方法地震旅行时数据时深转换,绘制的构造图既能符合井的深度数据,又能确切地表现地震旅行时间趋势,可以很好地解决用其它方法做时深转换的边界效应问题,从而提高构造成图质量。

An effective approach for structure mapping is presented If the secondary variable and the primary variable have a definitive relation of physical sense, Kriging-with-an-external-drift is a simple and efficient algorithm to incorporate a secondary variable in the estimation of the primary variable. The correlativity between seismic travel time and the corresponding well depth as well as the continuity of seismic events and regional distribution of seismic data makes it possible to use the Kriging-with-an-external-drift to do time-depth conversion. The resulted structural map not only is in good agreement with well depth, but also correctly reveals the change trend of seismic travel time. This method successfully solves the boundary effects of time-depth conversion that other methods usually encounter, resulting in improvement of the quality of structural map.