Uncertainty assessment in the stratigraphic well correlation of a carbonate ramp: Method and application to the Beausset Basin, SE France

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• 作者：Florent Lallier^a ; ^b ; Guillaume Caumon^a ; ^{Guillaume.Caumon@univ-lorraine.fr" class="auth_mail" title="E-mail the corresponding author} ; Jean Borgomano^c ; Sophie Viseur^c ; Jean-Jacques Royer^a ; Christophe Antoine^a
• 关键词：Stratigraphic Correlation ; Uncertainties ; Dynamic Time Warping ; Geostatistics ; Reservoir modeling
• 刊名：Comptes Rendus Geoscience
• 出版年：2016
• 出版时间：September-October 2016
• 年：2016
• 卷：348
• 期：7
• 页码：499-509
• 全文大小：2408 K

文摘

We assess stratigraphic correlation uncertainties by stochastically generating several possible correlations lines between a set of stratigraphic logs. We motivate the use of automatic correlation methods to sample this uncertainty and introduce a stochastic version of Dynamic Time Warping (DTW) that correlates two logs. This method is extended to a larger number of logs using a sequential application of DTW. When available, low-frequency stratigraphic events are correlated first, and then used to constrain the correlation of higher-order events. All DTW variants use elementary correlation costs corresponding to the likelihood of each possible horizon. The method is demonstrated on a carbonate ramp of the Cretaceous southern Provence Basin, SE France, using costs that measure the consistency between the computed platform slope angle and a theoretical depositional profile. We show that these correlation uncertainties significantly impact facies proportions in stratigraphic layers.