Joint location of microseismic events in the presence of velocity uncertainty
Joint location of microseismic events in the presence of velocity uncertainty
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DOI：
10.1190/geo2013-0390.1
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发表时间：
2014-10
期刊：
影响因子：
3.3
通讯作者：
O. Poliannikov;M. Prange;A. Malcolm;H. Djikpesse
中科院分区：
文献类型：
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作者：
O. Poliannikov;M. Prange;A. Malcolm;H. Djikpesse
地震事件的位置被用来推断储层性质并指导未来的生产活动，以及确定和理解应力场。因此，定位地震事件与不确定性量化仍然是一个重要的问题。使用贝叶斯分析，联合概率密度函数的所有事件的位置构造从运动数据中的拾取误差的先验信息和明确量化的速度模型的不确定性。所有地震事件的同时定位捕获绝对事件位置和一些事件相对于其它事件的相对位置，连同它们的相关不确定性沿着。我们发现，一个不确定的速度模型的位置不确定性在许多现实的情况下，可以显着减少联合定位事件。在实践中，使用所提出的方法可以更好地估计从多个事件位置估计的许多感兴趣的量，例如断层尺寸和裂缝间距或方向。
The locations of seismic events are used to infer reservoir properties and to guide future production activity, as well as to determine and understand the stress field. Thus, locating seismic events with uncertainty quantification remains an important problem. Using Bayesian analysis, a joint probability density function of all event locations was constructed from prior information about picking errors in kinematic data and explicitly quantified velocity model uncertainty. Simultaneous location of all seismic events captured the absolute event locations and the relative locations of some events with respect to others, along with their associated uncertainties. We found that the influence of an uncertain velocity model on location uncertainty under many realistic scenarios can be significantly reduced by jointly locating events. Many quantities of interest that are estimated from multiple event locations, such as fault sizes and fracture spacing or orientation, can be better estimated in practice using the proposed approach.