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首页> 外文会议>Rock Mechanics in the National Interest >Geomechanical and petrophysical properties of fracture systems in permocarboniferous 'red-beds'
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Geomechanical and petrophysical properties of fracture systems in permocarboniferous 'red-beds'

机译：含石炭世的“红层”中断裂系统的地球力学和岩石物理特性

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摘要

Permocarboniferous red-beds cover large areas of folded and thrusted Palaeozoic meta-sediments and older crystalline basement rocks. Small to medium scale basement faults and joints do not proceed into the Permocarboniferous cover. Fracture patterns are related to rock strength, friction controlled multi-layer interaction and local stress fields. Because Permocarboniferous red-beds are coarse grained rocks with only minor occurrences of silt- and clay-stones, friction is one of the principle geomechanical properties. The prominent cement is calcite while massive quartzitic cementation is restricted to areas with strong volcanic activity. Depending on the regional type of cementation the cohesion varies significantly. Another parameter, important for rock strength, is the packing density, which also varies significantly in red-beds. The results of this study show that fractures produced by extensional horizontal strain are log-normally or exponentially distributed with spacing types and dimensions related to the mechanical properties of multi-layered sequences. Fractal spacing distributions are indicative for local horizontal compressional strain.
机译：石炭纪的红层覆盖了大范围的褶皱和逆冲古生界准沉积物和较旧的晶体基底岩石。中小型地下室断层和节理不进入石炭纪覆盖层。断裂模式与岩石强度，摩擦控制的多层相互作用和局部应力场有关。由于高石炭世的红层是粗粒状的岩石，只有少量的粉砂岩和粘土岩发生，因此摩擦是主要的地质力学性质之一。突出的水泥是方解石，而大量的石英胶结作用仅限于火山活动强烈的地区。取决于胶结的区域类型，内聚力显着变化。对岩石强度很重要的另一个参数是堆积密度，在红层中堆积密度也有很大变化。这项研究的结果表明，由水平拉伸应变产生的裂缝呈对数正态或指数分布，其间距类型和尺寸与多层层序的力学性能有关。分形间距分布指示局部水平压缩应变。

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