摘要
深水沉积根据沉积物来源可分为深水异地沉积和深水原地沉积。深水异地沉积是指海洋或湖泊深水区经横向运移而形成的沉积,它是相对于垂直降落沉积作用形成的原地沉积而言的。通常前者形成的沉积物比后者的粒度粗。深水异地沉积主要包括重力流沉积和深水牵引流沉积;深水原地沉积主要包括深水页岩沉积和深水岩盐沉积。重力流沉积还可按其发育于各种不同的沉积环境而形成独具一格的沉积体系,划分为扇状沉积体系(海底扇或湖底扇)、沟道或槽谷沉积体系、层状或带状沉积体系等。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潮汐、内波沉积。深水牵引流沉积的储集性能优于浊流沉积,故具有非常重要的含油气潜能。
Deep-water deposits may be divided into allochthonous deposit and autochthonous deposit by origin.Allochthonous deposit refers to the sediments deposited in deep-waters of sea or lake through lateral transport;it is a relative term to autochthonous deposit formed by vertical sedimentation.The granularity of the former is usually coarser than the latter.Deep-water allochthonous deposit mainly includes gravity flow deposition and drag flow deposition;deep-water autochthonous deposit mainly includes shale deposit and evaporite deposit.Gravity flow deposition can be further divided into fan-like sedimentary system(submarine fan or sublacustrine fan),channel or trough sedimentary system,bedded or banded sedimentary system and so on.Deep-water drag flow deposition has been a new territory of sedimentology research since 1960s'.At present the research on deep-water drag flow deposition mainly focuses on contourite,internal tide,internal wave depositions.The reservoir property of deep-water drag flow deposition is better than turbidite deposit,therefore has an important potential of hydrocarbon accumulation.
出处
《特种油气藏》
CAS
CSCD
2008年第2期1-6,共6页
Special Oil & Gas Reservoirs
关键词
重力流沉积
牵引流沉积
深水环境
油气资源
研究现状
gravity flow deposition
drag flow deposition
deep-water surroundings
hydrocarbon resources
