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Flow pathways in multiple-direction fold hinges: Implications for fractured and karstified carbonate reservoirs
Journal of Structural Geology ( IF 3.1 ) Pub Date : 2021-03-21 , DOI: 10.1016/j.jsg.2021.104324
Cayo C.C. Pontes , Francisco H.R. Bezerra , Giovanni Bertotti , Vincenzo La Bruna , Philippe Audra , Jo De Waele , Augusto S. Auler , Fabrizio Balsamo , Stephan De Hoop , Luca Pisani

Caves developed in carbonate units have a significant role in fluid flow, but most of these subsurface voids are below seismic resolution. We concentrated our study on four caves to determine the roles of fractures and folds in the development of karst conduits that may form flow pathways in carbonate reservoirs. We performed structural field investigations, petrographic analyses, and geometric characterization using Light Detection and Ranging (LIDAR) for caves in Neoproterozoic carbonates of the Salitre Formation, central part of the São Francisco Craton, Brazil. We found that the conduit shape, usually with an ellipsoidal cross-section, reflects the tectonic features and textural variations. Carbonate layers containing pyrite and low detritic mineral contents are generally karstified and appear to act as favorable flow pathways. Our results indicate that the development of the karst system is related to fracture corridors formed along parallel and orthogonal sets of fold hinges, which provide preferential pathways for fluid flow and contribute to the development of super-K zones. This study provides insights into the prediction of subseismic-scale voids in carbonate reservoirs, with direct application for the hydrocarbon and hydrogeology flow and storage.



中文翻译:

多向折页铰链中的流动路径:对裂缝和岩溶碳酸盐岩储层的影响

碳酸盐岩单元中发育的溶洞在流体流动中起着重要作用,但是这些地下大部分空隙都低于地震分辨率。我们将研究集中在四个洞穴上,以确定裂缝和褶皱在岩溶管道发育中的作用,这些岩溶管道可能会形成碳酸盐岩储层的流动路径。我们使用光探测和测距(LIDAR)对巴西圣弗朗西斯科·克拉顿(SãoFrancisco Craton)中部Salitre组的新元古代碳酸盐岩中的洞穴进行了结构现场调查,岩石学分析和几何表征。我们发现,通常具有椭圆形横截面的导管形状反映了构造特征和纹理变化。含有黄铁矿和低含量的有害矿物的碳酸盐层通常被岩溶化,并且似乎是有利的流动通道。我们的结果表明,岩溶系统的发育与沿折叠铰链的平行和正交集形成的裂缝廊道有关,这些裂缝廊道为流体流动提供了优先通道,并为超级K区的发展做出了贡献。这项研究为碳酸盐岩储层的亚地震规模孔隙的预测提供了见识,并直接应用于碳氢化合物和水文地质流动和存储。

更新日期:2021-03-31
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