Ground penetrating radar - based investigation of fracture stratigraphy and structural characterization in karstified carbonate rocks, Brazil

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Structural Geology Pub Date : 2024-09-14 DOI:10.1016/j.jsg.2024.105263
Vincenzo La Bruna , Renata E.B. Araújo , Juliana A.G. Lopes , Luana S. Silva , Walter E. Medeiros , Fabrizio Balsamo , Josibel G. Oliveira Jr. , Flávio L. Santana , Francisco H.R. Bezerra
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Abstract

Fracture stratigraphy study for a subsurface sedimentary rock sequence can be a challenging and demanding task. Typically, the data obtained from seismic and well-logs are heavily impacted by resolution issues and are difficult to interconnect. In this work, we document and extract fracture properties (orientation, density, intensity, etc.) from a layered carbonate sequence for fracture stratigraphy characterization. High-resolution subsurface Ground Penetrating Radar (GPR) data images, coupled with drone and previously documented well-log profiles, were analyzed to achieve the structural characterization task. The studied outcrop is localized in the Potiguar Basin (Brazil), where the Cretaceous Jandaíra Formation carbonates are exposed for hundreds of meters. The sequence is subdivided into an upper packstone/grainstone portion and a lower wackestone bed package. We documented the higher fracture intensity/density in the lower bed package portion, highlighting that depositional texture and intra-bed stylolites control the higher fracture distribution in the sequence. Finally, a 3D conceptual model describing the overall results is presented. This model summarizes and shows the innovative fracture stratigraphy method based on the GPR data analysis.

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基于地面穿透雷达的巴西岩溶碳酸盐岩断裂地层和结构特征研究
对地下沉积岩序列进行断裂地层学研究是一项极具挑战性的艰巨任务。通常情况下,从地震和油井记录中获得的数据会受到分辨率问题的严重影响,并且难以相互连接。在这项工作中,我们记录并提取了层状碳酸盐岩序列的断裂属性(方向、密度、强度等),以进行断裂地层表征。我们分析了高分辨率地下地面穿透雷达(GPR)数据图像,并结合无人机和先前记录的井记录剖面图,以完成构造特征描述任务。所研究的露头位于波蒂瓜尔盆地(巴西),白垩纪扬达伊拉层碳酸盐岩在此出露数百米。该层序被细分为上部的包岩/粒岩部分和下部的瓦基岩床组。我们记录了较低床层包裹部分较高的断裂强度/密度,强调沉积纹理和床层内的苯乙烯岩控制了该层序中较高的断裂分布。最后,介绍了描述总体结果的三维概念模型。该模型总结并展示了基于 GPR 数据分析的创新断裂地层学方法。
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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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