内波沉积中指向沉积构造的形成机理  

The Generational Mechanism of Orientating Sedimentary Structure by Internal-waves

作　　者：王青春[1] 鲍志东[1] 贺萍[2] 

机构地区：[1]石油大学资源与信息学院,北京102249 [2]华北油田物探研究院,河北任丘062552

出　　处：《沉积学报》2005年第2期255-259,共5页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(批准号:40272060)资助;石油科技中青年创新基金项目(批准号:2002F70102)资助

摘　　要：深海大型沉积物波的发现,引起了国内外内波成因理论的兴起和发展。研究认为,内波作用于海底时可对海底沉积物进行改造,形成指向沉积构造,这种指向沉积构造可为单向、双向或多向,而其中与内波传播方向相反的反向沉积构造可能是内波沉积所特有的。对于这种反向沉积构造的形成,以LaFond的理论为代表,认为内波引起的底流水平流速反比于密度界面距海底的高度,波谷接近海底,因而可形成反向沉积构造。经研究分析,发现内波与表面波在本质上具有一定的相似性,因而认为用一般意义上的波动理论来解释内波沉积中指向沉积构造的形成机理更加易于理解。明确指向沉积构造的形成机理对于内波沉积的识别具有重要意义。The discovery of the large sedimentary-waves in deep water, caused the generations and the developments of internal-waves both home and abroad. The study shows that internal-waves can shape the sediments on seafloor and form orientating sedimentary structure. This kind of structure includes single-direction, double-directions and multidirections. Maybe the returning structure is the special character of internal-waves. LaFond＇s theory about the generation of this kind of structure is widely accepted. The theory indicates that the velocity of bottom currents formed by internal-waves is reverse ratio to the distance between the density interface and the seabed. Returning transport is the main trends of internal-waves because the trough of wave is close to the seafloor. The research concludes that internalwaves are similar homology of surface-waves and the generation of the orientating sedimentary structure formed by internal-wave can be explained clearly by the general fluctuation theory successfully. The generation mechanism of orientating sedimentary structure is very important to the recognition of the internal-waves sediments.

关 键 词：内波 指向沉积构造 表向波 

分 类 号：P512.2[天文地球—地质学]