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The impact of a quick 4D seismic survey and processing over the Halfdan Field, Danish North Sea

机译：快速4D地震勘测和处理对丹麦北海Halfdan油田的影响

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摘要

The quick turnaround of seismic processing of a 4D time lapse survey over the Halfdan oil field allowed for interpretation and integration of the new 4D results seven weeks after completion of the seismic acquisition. Analysis of the first fast track 4D dataset led to improved processing parameters and an additional demultiple application which yielded a significantly improved fast track dataset 11 weeks after the seismic acquisition was completed. The repeat 4D seismic survey was acquired in the summer of 2012 in order to provide a better understanding of the sweep efficiency from the line drive water flood, guide future well interventions and improve the reservoir model. The baseline 3D seismic-data was acquired in 1992/1993, prior to field development, and the first monitor 3D seismic was acquired in 2005. The rock physics model shows that increased water saturation due to the water flooding along the injectors in the Tor oil-bearing reservoir dominates the 4D change in acoustic impedance yielding a hardening response. The rock physics model was used to convert the reservoir model pressure and saturation changes from the three time-steps to modelled acoustic impedance changes. Examples will be shown from the 4D time lapse and the reservoir model acoustic impedance changes.
机译：哈尔夫丹油田4D时间推移勘测的地震处理工作快速周转，可以在地震采集完成后7周对新的4D结果进行解释和整合。对第一个快速通道4D数据集的分析导致改进的处理参数和额外的倍数应用，在地震采集完成后11周，产生了显着改进的快速通道数据集。 2012年夏天进行了一次重复的4D地震勘测，目的是为了更好地理解线路驱水洪水的扫除效率，指导未来的油井干预措施并改善储层模型。在油田开发之前，于1992/1993年获得了基线3D地震数据，并于2005年获得了首个监测3D地震数据。岩石物理模型表明，由于Tor油中沿喷油器注水造成的水饱和度增加轴承储层主导了声阻抗的4D变化，从而产生硬化响应。岩石物理模型用于将储层模型的压力和饱和度变化从三个时间步转换为建模的声阻抗变化。将通过4D时间流逝显示示例，并且储层模型的声阻抗会发生变化。

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