Modelling changes in elastic wave velocities in sediments and rocks as they undergo burial and uplift can reveal aspects of their burial history. This has implications in the petroleum risking procedures, as aspects such as hydrocarbon maturation and reservoir quality are key ingredients. Previous modelling for such a purpose assumes constant velocity and porosity during uplift after the cessation of cementation. Laboratory data of a synthetic sandstone formed under stress, and subjected to loading and unloading cycles are used to test this assumption. The experimental P‐wave velocities show a clear increase in stress dependence during the uplift simulation. Besides, the P‐wave anisotropy transforms from negative to positive. These observations are combined to make an updated modelling workflow to mimic the experimental results better. The modelling is conducted in different phases. Loading before cementation is modelled using a triaxial granular medium theory. For the laboratory data, a novel anisotropic formulation of the patchy cement model captures the observed trends. A modified crack model incorporates the stress sensitivity seen during the unloading that simulates uplift. The results of the integrated rock physics workflow mimic the laboratory data very well. A conceptual field example using the rock physics workflow illustrates how the exclusion of the stress dependence during uplift can lead to an underestimation of the exhumation magnitude.

中文翻译：

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整合岩石物理实验室数据和建模以改进隆升特征描述方法

对沉积物和岩石进行埋藏和隆起过程中弹性波速度的变化进行建模可以揭示其埋藏历史的各个方面。这对石油风险规程具有影响，因为碳氢化合物成熟度和储层质量等方面是关键因素。为此目的的先前建模假设在胶结作用停止后的隆起过程中速度和孔隙率恒定。使用在压力下形成的人造砂岩的实验室数据，并对其进行加载和卸载循环，以测试该假设。实验的P波速度显示出在抬升模拟过程中应力依赖性明显增加。此外，P波各向异性从负向正转换。这些观察结果相结合，形成了更新的建模工作流程，以更好地模拟实验结果。建模是在不同阶段进行的。使用三轴颗粒介质理论对胶结之前的载荷进行建模。对于实验室数据，斑块水泥模型的新型各向异性配方可捕获观察到的趋势。修改后的裂缝模型包含了在卸载过程中看到的应力敏感度，该应力模拟了隆起。集成岩石物理工作流程的结果很好地模拟了实验室数据。使用岩石物理学工作流程的概念性现场示例说明了在抬升过程中排除应力依存关系如何导致低估掘出的幅度。修改后的裂缝模型包含了在卸载过程中看到的应力敏感度，该应力模拟了隆起。集成岩石物理工作流程的结果很好地模拟了实验室数据。使用岩石物理学工作流程的概念性现场示例说明了在抬升过程中排除应力依存关系如何导致低估掘出的幅度。修改后的裂缝模型包含了在卸载过程中看到的应力敏感度，该应力模拟了隆起。集成岩石物理工作流程的结果很好地模拟了实验室数据。使用岩石物理学工作流程的概念性现场示例说明了在抬升过程中排除应力依存关系如何导致低估掘出的幅度。