收稿日期: 2005-11-14
修回日期: 2006-02-09
网络出版日期: 2006-06-15
基金资助
国家重点基础研究发展计划项目“前陆和复合盆地的形成及油气效应”(编号：G200004670502)资助.
Two Types of Normal Faulting and Interplaying Mode between Them within the Context of Foreland
Received date: 2005-11-14
Revised date: 2006-02-09
Online published: 2006-06-15
许多前陆盆地同时存在着下部的裂陷正断裂和上部的造山期的挠曲正断裂。作用在均质不分层和非均质分层板块中的挠曲正断裂具有不同的外观形态和形变的空间协调机制，前者断面陡直、贯穿深远；后者则呈坡坪式形态。裂陷正断裂和挠曲正断裂具有3种相互作用方式、差异甚殊的断裂总体形态和中性面分布位置不同的应力体制。Ⅰ类，挠曲正断裂局限在陆缘期或坳陷期层序中；Ⅱ类，裂陷期正断裂断至断陷期层序，且以裂陷正断裂为基础而存在，二者构成完整而独特的断裂组合；Ⅲ类，挠曲正断裂亦断穿至断陷期层序，但和裂陷正断裂并不存在直接关系。这三类关系对孔隙—裂缝网络体具有不同的影响，并和应力体制一道，对流体尤其是烃类的作用过程有差异很大的影响。地层在跨越同生正断裂和挠曲正断裂时所发生的厚度的变化，起因于二者在物源方向上的完全不同。
刘振湖 , 王海荣 , , 邓安雄 , 黄奇志 , 王英民 . 前陆背景下的两种正断裂现象及其相互作用模式[J]. 地球科学进展, 2006 , 21(6) : 633 -640 . DOI: 10.11867/j.issn.1001-8166.2006.06.0633
Rifting normal faults which commonly constitute the base of the subsequent foreland strata and flexural faults coexist in many foreland basins. Flexural faults acting within the homogeneous and non-stratified plate commonly take on steep, planar fault plane form. Those within the heterogeneous and stratified plate usually present the ramp-flat form. There are three types of interplaying relation and corresponding stress distribution between the rifting normal faults and flexurial normal faults. The flexural faults of Type one confined in continental marginal stratal sequences; Those of Type Two can extend into the rifting strata and acting based on those rifting normal faults; Those of Type Three exist in direct relation with rifting normal faults although its extending similar to the Type Two. These three types exert different influence on porosity-fissure system, act with different stress distribution and influence the flow especially the hydrocarbon furtherly. Eventually the similar thickness changes across the rifting normal faults and flexural faults can attribute to their difference of sources.
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