深水牵引流沉积特征及研究现状

深水牵引流沉积是20世纪60年代以来沉积学迅速发展的一个新的研究领域。目前深水牵引流沉积的研究主要集中于等深流沉积和内湖汐、内波沉积。等深流沉积研究从60年代中期起步,至今已有长足的进展,尤其是现代等深沉沉积研究方面。目前对等深流沉积的形成机理、结构、构造、层序、岩相特征及鉴别标志方面已有很深的认识。等涤岩丘的发现是该领域最为重要、最具特色的突出成果,已在深海区发现大量规模可与海底扇相比拟的大型现代等涤岩丘,地层记录中也有发现。内潮汐、内波沉积研究始于叨年代初期,进展很快,现已对其形成机理、结构、构造、层序、岩相特征及鉴别标志进行了系统研究。我国浙西和塔里木盆地奥陶系的内潮汐、内波沉积已成为该领域的典型研究实例。深水牵引流沉积的储集性能优于浊积岩,故具有非常重要的含油气潜能。

CHARACTERISTICS AND RESEARCH STATUS OF DEEP-WATER TRACTIVE CURRENT DEPOSITS

Since 1960's, the study of deep-water tractive current deposits has become a new research field in sedimentology. The present studies on deep-water tiactive current deposits are mainly focused on contourits current deposit, internal-tide and internal-wave deposits. Considerable progress has been made in the study of contourite corrent depositssince mid-1960's, especially in the study of modern contourite deposits. Now deep understanding has made on the formation mechenism, the characteristics of texture and structure, the vertical sequences, the rock facies and recognitionmarks of contourite deposits. The discovery of contourite-dome is the most important and distinctve achievement in this field. Numerous large-scale modern contourite-dome, which can be compared with deep-water turbidite fans, were discovered in deep-water oceanic areas and in stratigraphic record. The study on internal-tide and internal-wave depositsbegan in the early 1990's and developed rapidly, and has made considerable progress in the formation mechanism, thecharacteristics of texture and structure, the vertical sequences, the rock facies and arcognition marks. The Ordovician internal-tide and internal-wave deposits in West Zhejiang and Tarim Basin are typical cases in this field. Compared withturibidities, the deep-water tractive current deposits are more favourible in the reservoir characteristics, and have veryimportant oil-gas-bearing potential.