河南泌阳凹陷双河地区核桃园组第三段重力流沉积研究

本文通过对双河地区核桃园组第三段的岩性、沉积构造、粒度分析和测井相研究,利用电子计算机技术、电镜扫描和X—射线衍射曲线分析等手段,提出区内既有重力流沉积又有牵引流沉积,其中重力流沉积占主导地位。根据主要支掌机制,区内重力流沉积可以分为碎屑流、颗粒流和浊流沉积。重力流可以由滑塌引起,也可以由洪流引起,并具冲积性质。依据沉积背景,结合沉积机理,本文论述了碎屑流沉积的特殊性和部分具有浅水性的特征。并提出了扇三角洲—湖底扇模式,简略阐述了各亚相的沉积特征和空间展布规律。

STUDY ON SEDIMENTS OF GRAVITY FLOW IN HE FORMATION 3,SHUANGHE AREA BIYANG DEPRESSION,HENAN

On the basis of researching into the lithology,the sedimentary structure, the log facies and the analysis of grain size, and of applying computer technique, electronic microscope and X-ray diffraction in He formation 3 of Shuanghe area, it is pointed out in this paper that the sediments are deposited by both gravity flow and tractive current. The major sediments are gravity flow deposits. Three kinds of gravity flows, i.e.debris flow, grain flow and turbidity flow, are divided by the main support mechanism of sediments,and depicted the depositional properties of subfacies and their distributed patterns in space.