摘要:
根据国内外等深流沉积的研究成果,从产状、成分、结构、沉积构造、垂向层序和与海平面变化的关系等方面总结了等深流沉积特征以及与其他类型深水沉积的区别。等深流沉积是深水牵引流沉积中的一种重要类型,蕴含有重要的古海洋学和古气候信息,对其进行解析是近年国际海洋学、气候学研究的热点。等深流沉积最明显的特征包括对称递变层序以及强烈的生物扰动,其储集性能优于浊流沉积,具有非常重要的含油气潜能。南海是中国具有深海环境的唯一边缘海盆,在南海北部深水陆坡环境已确认等深流沉积普遍存在,是等深流研究的理想场所,但南海的等深流沉积类型、形态特征以及控制其发育的主要因素等问题有待进一步研究。
Abstract:
The depositional characteristics of contourite and its difference with other deep-water deposits,including occurrence,composition,texture,sedimentary structure,vertical sequence and relationship with sea level change,were discussed in this paper based on the research results from domestic and international sources.As a kind of important deep-water deposits of traction flow,contourite contains sufficient information on paleoceanography and paleoclimatology,and has become a hotspot of research in the world.Contourites are specially characterized by symmetrical grading sequence and high bioturbation.In terms of oil accumulation,contourite is a better reservoir than turbidite.The South China Sea is the only marginal sea with ocean crust in China.There is evidence showing that contourite widely exist in the northern slope of South China Sea and is an ideal site for research of contour currents.However,the types,geometric features and the controlling factors in the South China Sea remain unclear and further studies are required.
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