Structural network analysis from outcrop analogues of the crystalline Odenwald

Enhanced quantitative characterisation of the geometrical features and variability of the fracture network properties is an essential prerequisite to model fracture networks in crystalline reservoirs. By combining regional digital elevation model analysis and local outcrop investigation, eleven outcrops from various lithologies were investigated through a structural framework (fracture dimension, orientation, clustering and spacing). The structural dataset presented here contains the regional DEM interpretation at two resolutions (25 m , 5 m) of the Northern Upper Rhine Graben and the Odenwald. Additional statistics on LiDAR and GIS structural interpretation of eleven outcrops are provided. Fracture length, orientation, dip, density and intensity are calculated for each profile. Power-law parametrisation is extracted from the length distribution of 2D interpreted maps. This parametrisation of the fracture network is then used to build 24 standalone DFN models for two sites, from the Lichtwiese and Heppenheim datasets, in Fracman ®. These models consider various configurations of the fracture termination, percentage of active fracture, and aperture estimation methods. The outputs of the models in terms of permeability and fracture aperture are provided here. This dataset supplements another publication (Bossennec et al., submitted) that presents the structural organisation of crystalline rocks from several crystalline lithologies in the Odenwald and first-order DFN modelling of associated properties at different specific depths (800 m and 4000 m).

对裂隙网络的几何特征与属性变化开展精细化定量表征，是结晶岩储层裂隙网络建模的核心前提条件。本研究结合区域数字高程模型（Digital Elevation Model, DEM）分析与露头野外调查，针对11处不同岩性的露头开展了构造框架下的裂隙特征研究，涵盖裂隙尺寸、产状、集群性与间距等要素。本次发布的构造数据集包含北上莱茵地堑与奥登瓦尔德地区两种分辨率（25米、5米）的区域DEM解译成果，并附带了11处露头的激光雷达（Light Detection and Ranging, LiDAR）与地理信息系统（Geographic Information System, GIS）构造解译统计数据。针对每条测线，均计算了裂隙长度、产状、倾角、密度与强度等参数；从二维解译图的长度分布中提取了幂律参数化模型。随后，基于该裂隙网络参数化模型，依托Lichtwiese与Heppenheim数据集，在Fracman®软件中为两个研究区构建了24个独立的离散裂隙网络（Discrete Fracture Network, DFN）模型。这些模型涵盖了裂隙终止方式、有效裂隙占比与裂隙开度估算方法等多种配置方案。本次发布的数据包含了上述模型在渗透率与裂隙开度方面的模拟结果。本数据集可作为另一项已投稿论文（Bossennec等，已投稿）的补充资料，该论文阐述了奥登瓦尔德地区多种结晶岩的构造组织特征，并针对不同特定深度（800米与4000米）开展了关联属性的一阶离散裂隙网络建模工作。