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First Arrival Time Auto-Picking Method Based on Multi-Time Windows Energy Ratio

机译：基于多次Windows能量比的首次到达时间自动选取方法

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摘要

First arrival time auto-picking technique plays an important role in seismic exploration. It is widely used in shallow layer tomography and static correction. Conventional method that based on sliding time windows energy ratio is not stable. Here a new method based on multi-time windows energy ratio is proposed. Combining with automatic quality control and phase-domain first arrival estimation technique, our method performs perfectly on seismic records of normal S/N ratio. In the computational process of conventional sliding time windows energy ratio method, first arrivals are often determined by the maximum energy ratio of two adjacent sliding time windows. It is well known that for low S/N ratio data the conventional picking is not effective, and for high S/N ratio data weak reflections are hardly detected. The reason is that first arrival time does not correspond to the maximum energy ratio. Meanwhile conventional method sometime picks local secondary extreme of energy ratio. The new method of multi-time windows energy ratio method takes both maximum and local secondary extreme in consideration. Hence new method promotes the stability and accuracy of first arrival picking. Combined with automatic quality control and phase-domain first arrival estimation, the new method performs well in its application in the middle part of Dzungarian Basin(Northwest China).
机译：首次到达时间自动选取技术在地震勘探中起着重要作用。它广泛用于浅层层析成像和静态校正中。基于滑动时间窗能量比的传统方法不稳定。提出了一种基于多次窗能量比的新方法。结合自动质量控制和相域先到达估计技术，我们的方法在正常信噪比下的地震记录中表现出色。在传统的滑动时间窗能量比方法的计算过程中，首次到达通常由两个相邻的滑动时间窗的最大能量比确定。众所周知，对于低信噪比的数据，常规拾取是无效的，而对于高信噪比的数据，几乎没有检测到弱反射。原因是首次到达时间不对应于最大能量比。同时传统方法有时会选择局部能量比的次级极限。新的多时间窗口能量比方法同时考虑了最大值和局部次要极端。因此，新方法提高了首次到达采摘的稳定性和准确性。结合自动质量控制和相域先到达估计，该新方法在Dzungarian盆地中部地区（中国西北）的应用效果良好。

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