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Enhancing dynamic interpretation at the Valhall Field by correlating well activityto 4D seismic signatures

机译：通过将井活动与4D地震特征相关联来增强Valhall油田的动态解释

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摘要

Sequences of 4D seismic changes extracted over different time intervals from multiply repeated seismic surveys are correlated with the identical time sequences of cumulative fluid volumes produced from or injected into wells. Maps of these cross-correlations have previously been shown to produce a localized signal in the connected neighbourhood of individual wells. The technique is applied to the frequently repeated seismic surveys from the life of field seismic project in the Valhall Field, for which the 4D seismic signature is dominated by compaction-assisted pressure depletion. For these data, both acoustic impedance and time-shift attributes are found to have a remarkably consistent correlation with the well activity from selected groups of wells. Furthermore, maps of these results have sufficient fine scale detail to resolve interfering seismic responses generated by closely spaced wells and discrete zones of gas breakout along long horizontal producers. We conclude that uniting well data and 4D seismic data using our proposed method provides a new attribute for dynamic interpretation of the producing reservoir.
机译：从多次重复地震勘测中在不同时间间隔提取的4D地震变化序列与从井中产生或注入到井中的累积流体体积的相同时间序列相关。这些互相关的映射先前已显示在各个井的连接邻域中产生局部信号。该技术已应用于Valhall油田现场地震项目生命周期中频繁重复的地震勘测，为此，4D地震特征主要由压实辅助压力耗竭所主导。对于这些数据，发现声阻抗和时移属性都与选定井组的井活动具有显着一致的相关性。此外，这些结果的地图具有足够的精细比例，可以解决沿长水平生产井的密集井和离散的瓦斯突破区域所产生的干扰地震响应。我们得出的结论是，使用我们提出的方法将油井数据和4D地震数据结合在一起，为动态解释生产油藏提供了新的属性。

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