We systematically incorporate burial history, sea floor geometry and tectonic loads from a sequential kinematic restoration model into a 2D evolutionary geomechanical model that simulates the formation of the Sandia salt diapir, Tarfaya basin, NW African Coast. We use a poro-elastoplastic description for the sediment behaviour and a viscoplastic description for the salt. Sedimentation is coupled with salt flow and regional shortening to determine the sediment porosity and strength and to capture the interaction between salt and sediments. We find that temporal and spatial variation in sedimentation rate is a key control on the kinematic evolution of the salt system. Incorporation of sedimentation rates from the kinematic restoration at a location east of Sandia leads to a final geomechanical model geometry very similar to that observed in seismic reflection data. We also find that changes in the variation of shortening rates can significantly affect the present-day stress state above salt. Overall, incorporating kinematic restoration data into evolutionary models provides insights into the key parameters that control the evolution of geologic systems. Furthermore, it enables more realistic evolutionary geomechanical models, which, in turn, provide insights into sediment stress and porosity.

中文翻译：

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底辟和盆地演化的地质约束演化地球力学模拟：以西非海岸塔尔法雅盆地为例

我们将埋葬历史，海床几何形状和构造载荷从顺序运动学恢复模型中系统地整合到了2D演化地球力学模型中，该模型模拟了西北非洲塔尔法亚盆地桑迪亚盐底辟的形成。对于沉积物行为，我们使用孔隙弹塑性描述；对于盐，我们使用黏塑性描述。沉积与盐流和区域缩短相结合，可确定沉积物的孔隙度和强度，并捕获盐与沉积物之间的相互作用。我们发现，沉积速率的时空变化是盐体系运动演化的关键控制。在桑迪亚以东的某个位置结合运动恢复中的沉积速率，得出最终的地质力学模型的几何形状与在地震反射数据中观察到的非常相似。我们还发现缩短率变化的变化会显着影响当今盐分之上的当前应力状态。总体而言，将运动学恢复数据整合到演化模型中可以洞悉控制地质系统演化的关键参数。此外，它可以实现更逼真的演化地球力学模型，进而提供对沉积物应力和孔隙度的洞察力。将运动学恢复数据整合到演化模型中，可以深入了解控制地质系统演化的关键参数。此外，它可以实现更逼真的演化地球力学模型，进而提供对沉积物应力和孔隙度的洞察力。将运动学恢复数据整合到演化模型中，可以深入了解控制地质系统演化的关键参数。此外，它可以实现更逼真的演化地球力学模型，进而提供对沉积物应力和孔隙度的洞察力。