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Uncertainty quantification in section-balancing using Pseudo-3D forward modeling – Example of the Malargüe Anticline, Argentina
Journal of Structural Geology ( IF 2.6 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.jsg.2020.104189
J. Witte , O. Oncken

Abstract Quantifying uncertainty in balancing cross-sections is an insufficiently resolved challenge. We present a new workflow to assess uncertainty of selected modeling parameters. In contrast to conventional restoration, we focus on forward modeling and mapping uncertainty in solution space. We test the approach by applying trishear as the most appropriate mechanism reproducing associated fault-fold systems. We present a new structural model of the exceptionally well exposed, thick-skinned Malargue Anticline, located in the Malargue Foldbelt, Neuquen Basin, Argentina. Several structural models of varying quality have been published by oil explorers and researchers, but lack detailed kinematic assessment. To minimize uncertainty, we systematically vary the key modeling parameters “shortening” and “ramp angle” to reduce the cross-sectional area difference, the misfit, between model and observation. We find that the misfit is highly sensitive to these two parameters. The total uncertainty for a single structure w.r.t. these values rarely undercuts 7%. Apparently dependencies exist between these parameters. We recommend this method be extended to other parameter combinations and tectonic settings. Our analysis results in new shortening rates for the MA (up to 1.57 mm/yr) and a refined genetic model, whereby the anticline was generated during Andean contraction, rather than evolving from a pre-existing structure.

中文翻译:

使用伪 3D 前向建模进行截面平衡的不确定性量化——以阿根廷 Malargüe 背斜为例

摘要 平衡横截面的量化不确定性是一个未充分解决的挑战。我们提出了一种新的工作流程来评估所选建模参数的不确定性。与传统恢复相反,我们专注于解决方案空间中的正向建模和映射不确定性。我们通过应用三剪力作为再现相关故障折叠系统的最合适机制来测试该方法。我们展示了位于阿根廷内乌肯盆地 Malargue 褶皱带的异常暴露、厚皮的 Malargue 背斜的新结构模型。石油勘探者和研究人员已经发表了几种不同质量的结构模型,但缺乏详细的运动学评估。为了尽量减少不确定性,我们系统地改变了关键建模参数“缩短”和“斜坡角度”,以减少模型和观察之间的横截面积差异、失配。我们发现失配对这两个参数高度敏感。单个结构的总不确定性与这些值相比很少低于 7%。显然,这些参数之间存在依赖关系。我们建议将此方法扩展到其他参数组合和构造设置。我们的分析产生了新的 MA 缩短率(高达 1.57 毫米/年)和一个完善的遗传模型,其中背斜是在安第斯收缩期间产生的,而不是从预先存在的结构演变而来。单个结构的总不确定性与这些值相比很少低于 7%。显然,这些参数之间存在依赖关系。我们建议将此方法扩展到其他参数组合和构造设置。我们的分析产生了新的 MA 缩短率(高达 1.57 毫米/年)和一个完善的遗传模型,其中背斜是在安第斯收缩期间产生的,而不是从预先存在的结构演变而来。单个结构的总不确定性与这些值相比很少低于 7%。显然,这些参数之间存在依赖关系。我们建议将此方法扩展到其他参数组合和构造设置。我们的分析产生了新的 MA 缩短率(高达 1.57 毫米/年)和一个完善的遗传模型,其中背斜是在安第斯收缩期间产生的,而不是从预先存在的结构演变而来。
更新日期:2020-12-01
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