Fracture-pattern variations around a major fold and their implications regarding fracture prediction using limited data: an example from the Bristol Channel Basin
Fracture-pattern variations around a major fold and their implications regarding fracture prediction using limited data: an example from the Bristol Channel Basin
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主要褶皱周围的裂缝模式变化及其对使用有限数据进行裂缝预测的影响：来自布里斯托尔海峡盆地的示例
DOI：
10.1144/gsl.sp.2004.231.01.06
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
J. Cosgrove
中科院分区：
文献类型：
--
作者：
M. Belayneh;J. Cosgrove
摘要本章重点介绍布里斯托海峡盆地反转过程中裂缝的演化，并研究了交替的Liassic石灰岩和页岩中裂缝网络的横向和纵向一致性。这项研究有两个主要目的。第一个是确定断裂系统的可靠性推导出使用更有限的数据，从较少暴露的地区或未暴露的地区采样，只有通过钻井，第二个是评估是否断裂连接到一个区域应力场或局部应力场的结果控制的几何形状和机制形成的褶皱。结合扫描线和窗口取样对节理形态进行了研究，结果表明，相邻灰岩层之间的裂隙系统存在相当大的变化，同一层内的裂隙系统也存在横向变化。虽然几乎没有疑问，在相邻的石灰岩床中的裂缝模式的独立发展是由干预页岩层，使他们成为机械解耦促进，这些变化的原因仍然不清楚。
Abstract This chapter focuses on the evolution of fractures during the inversion of the Bristol Channel Basin, and examines the lateral and vertical consistency of the resulting fracture network within the alternating Liassic limestones and shales. The study has two principal aims. The first is to determine the reliability of fracture systems deduced using more limited data from less well-exposed regions or unexposed regions sampled only by drilling, and the second is to assess whether the fractures are linked to a regional stress field or are the result of a local stress field controlled by the geometry and mechanism of formation of a fold. The joint patterns were studied using a combination of scanline and window sampling, and the results indicate that there are considerable variations in the fracture systems between adjacent limestone beds and also lateral variation within the same bed. Although there is little doubt that the independent development of fracture patterns in adjacent limestone beds is facilitated by the intervening shale horizons, which allow them to become mechanically decoupled, the reasons for these variations are still unclear.