The joint sets on the Lilstock Benches, UK. Observations based on mapping a full resolution UAV-based image

The joint sets on the Lilstock Benches, UK. Observations based on mapping a full resolution UAV-based image
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英国利尔斯托克长凳上的联合观测基于绘制全分辨率无人机图像

DOI:
10.1016/j.jsg.2021.104332
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发表时间:
2021
影响因子:
3.1
通讯作者:
Weismüller
Weismüller
中科院分区:
地球科学2区
文献类型:
--
作者:
Passchier;Passchier;Weismüller

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裂缝网络的露头研究对于了解地下裂缝性储层非常重要,但由于露头和图像分辨率的限制,大型露头中所有裂缝的完整地图很少。我们手动绘制了第一个基于全分辨率无人机的千兆像素数据集和南部布里斯托海峡盆地波切Lilstock Benches的DEM,这是石灰岩中层约束断裂网络的经典露头。我们提出了一个地图的模式和连续套关节在分米厚的石灰岩层的粘土岩层分开。使用解释标准的基础上横切关系,邻接和联合长度,多达8个连续的关节组进行了映射。结果表明,整个露头的节理几何形状和相互关系得到了充分解决。不同的节理组在形状、方向、空间分布和交叉关系方面具有独特的特征。关节的低角度交叉和连接的存在表明部分关节密封和再激活的时期。提出的数据集和解释作为大规模,完整的裂缝网络映射测试数字裂缝网络模型的大纲。
Outcrop studies of fracture networks are important to understand fractured reservoirs in the subsurface, but complete maps of all fractures in large outcrops are rare due to limitations of outcrop and image resolution. We manually mapped the first full-resolution UAV-based, Gigapixel dataset and DEM of the wave-cut Lilstock Benches in the southern Bristol Channel basin, a classic outcrop of layer-bound fracture networks in limestones. We present a map of the patterns and age relationships of successive sets of joints in dm-thick limestone layers separated by claystone beds. Using interpretation criteria based on crosscutting relationships, abutting and joint length, up to eight successive sets of joints were mapped. Results show that joint geometry and interrelations are fully resolved in the whole outcrop. Different joint sets have unique characteristics in terms of shape, orientation, spatial distribution and cross-cutting relations. The presence of low-angle crossings and junctions of joints suggest periods of partial joint sealing and reactivation. The dataset and interpretations are proposed as an outline for large scale, complete fracture network mapping to test digital fracture network models.
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