《地震沉积相解释》考察报告--覃瑞东-.docVIP

Lateral transfer: a source of additional overpressure? 英文文献翻译--侧向传输：一种额外的超压源？ Abstract: Overpressure generated by disequilibrium compaction can be enhanced at structural crests by the lateral transfer of fluids from deep, overpressured parts of a basin along laterally extensive inclined aquifers. Fluid flow modelling shows that the effect of an inclined aquifer ranges from being minimal to being a significant contributor (10 MPa) to crestal pore pressures depending on the style of structural evolution, the burial rate and the aquifer relief. Dynamic fluid flow models show that the Centroid Concept, a method for estimating crestal pressures based on a static view of subsurface fluid pressures, does not in general predict the pressure distribution associated with a dipping aquifer. A case study is presented from the Central North Sea where the Pre-Cretaceous reservoir forms part of an aquifer with 2.5 km of relief from the structural crest to the low point. The inclined aquifer is covered by a ubiquitous low permeability layer and has undergone extremely rapid recent burial (500 m/Ma). As expected from the generic modelling analysis, this combination of factors means that lateral transfer has a minor effect on the pressure development in the case study. 摘要：由不平衡压实产生的超压可以在构造顶部，由来源于沿着横向的广泛的斜含水层的盆地之深部的、超压的液体的侧向传输产生。流体流动模型表明，斜含水层的影响在最小的显著贡献者（10MPa）到依赖于构造演化类型、埋藏率和含水层缓冲的顶部核压力之间变化。动态流体模型表明，一种基于表层流体压力的静态观点来评价顶部压的方法，即质心概念，通常不能预测与斜含水层有联系的压力分配。从北海中央的一个研究案例可以看出，那儿的前白垩纪储层形成了部分从构造顶部到构造最低点2.5千米的含水层。斜含水层由一种很常见的低渗透层覆盖，也经历了近期的十分快速地掩埋（500m/Ma）。正如预期的那样从通用的建模分析，这些因素的组合意味着案例研究中的侧向传输对压力的发展影响不大。 Keywords: Lateral transfer; Disequilibrium compaction; Centroid Concept 关键词：侧向传输，不均衡压实，质心概念 Introduction 1.引言 Disequilibrium compaction, i.e. ineffective de-watering of sediments under loading stress, is thought to be a major cause of overpressure in sedimentary basins(e.g. Gaarenstroom, Tromp,de Jong Brandenburg,1993; Osborne Swarbrick, 1997), but may not be sufficient to explain the extreme ove