Abstract Structures hidden at depth can be assessed through drill cores recovered from them. A crucial part of petroleum geology study is to interpret structures from these cores collected from vertical and inclined drilling operations reaching different depths. We deduce analytically ideal structures in unrolled/unwrapped images of cylindrical drill cores. These structures are: (i) orthogonal and conjugate fractures, (ii) single generation periodic folds and type-1 and type-2 superposed folds, (iii) listric faults and (iv) different types of angular unconformities. The sinuous curves as found in unrolled images are not always characteristic of the structures. Therefore accurate identification of structures would require additional information, such as the drill core itself.

中文翻译：

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来自钻芯展开图像的结构地质解释

摘要 隐藏在深处的结构可以通过从中回收的钻芯进行评估。石油地质研究的一个关键部分是从这些从垂直和倾斜钻井作业中收集到的不同深度的岩心中解释结构。我们在圆柱形钻芯的展开/展开图像中推断出分析上的理想结构。这些结构是：(i) 正交和共轭裂缝，(ii) 单代周期褶皱和 1 型和 2 型叠加褶皱，(iii) 列断层和 (iv) 不同类型的角不整合。在展开图像中发现的蜿蜒曲线并不总是结构的特征。因此，准确识别结构需要额外的信息，例如钻芯本身。