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首页> 外文会议>U.S. Symposium on Rock Mechanics >Evolution of relay zones in normal faulted terranes: Integrating field geological studies with forward geomechanical models
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Evolution of relay zones in normal faulted terranes: Integrating field geological studies with forward geomechanical models

机译：正常断层地层中继区的演变：与前向地质力学模型集成现实地质研究

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摘要

Echelon arrangement of normal faults is a ubiquitous feature observed at multiple scales (mm - km) in many extensional tectonic settings. The deformation in the intervening rock volume between adjacent fault segments, termed the relay zone, occurs under a combination of rotational and distortional strains that are often distinct from the regional strain on the primary faults. As a result, relay zone structures cannot be reconciled with the far-field strain/stress field. We present an integrated analysis in which traditional outcrop-based geological analysis of the Hernandez Relay Zone (HRZ) in the Rio Grande Rift of New Mexico is compared and contrasted with quantitative 3D geomechanical forward modeling to provide a mechanical rationale for the observed structures in the HRZ. The model results suggest that the observed spatial variations in finite strain and the incremental changes in extension direction in the HRZ can be attributed to the interaction between the primary faults. Sensitivity analyses of the models suggests that obliquity of the structures in the relay zone increases with increasing fault overlap (for a given spacing), and decreases with yield strength of the intact rocks and coefficient of friction on the bounding faults. Sensitivity analysis of forward geomechanical models, when calibrated to field observations can be a powerful physics-based technique for predicting the potential orientations of secondary faults that can act as baffles or conduits for fluid flow in the subsurface.
机译：正常断层的梯队排列是在许多延伸构造设置中在多个尺度（毫米）的普遍存在的特征。在相邻故障区段之间的介入岩石体积中的变形，称为继电器区域，在旋转和扭曲菌株的组合下发生，其通常与主要断层上的区域菌株不同。结果，不能与远场应变/应力场协调中继区域结构。我们提出了一个综合分析，其中对新墨西哥州Rio Grande Rif的Rio Grande裂缝（HRZ）的传统露天地质分析进行了比较，与定量3D地质力学向前建模对比，为观察到的结构提供机械理由。 HRZ。模型结果表明，HRZ中观察到的有限应变的空间变化和延伸方向的增量变化可归因于主故障之间的交互。模型的敏感性分析表明，继电器区域中的结构的倾斜随着故障重叠的增加而增加（对于给定间隔），并且随着完整岩石的屈服强度和摩擦系数的屈服强度降低。向前地质力学模型的敏感性分析，当校准以场观测时可以是一种强大的基于物理技术，用于预测次要故障的潜在取向，其可以充当挡板或导管用于在地下流体流动。

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