沙滩子牛轭湖沉积特征  

SEDIMENTARY CHARACTERISTICS OF BAYOU IN SHATANZI

作　　者：曹跃华[1] 张春生[1] 刘忠保[1] 赖志云[1] 

机构地区：[1]江汉石油学院

出　　处：《石油与天然气地质》1995年第2期196-201,共6页Oil & Gas Geology

基　　金：中国石油天然气总公司资助

摘　　要：曲颈裁弯形成的沙滩子牛轭湖，属开放型沉积体系，经历了四岸崩塌凸岸堆积及裁弯形成两个阶段。出水口和入水口是主要沉积部位，沉积速率２～３ｍ／ａ，顶湾则沉积相当缓慢；粒度曲线第Ⅰ类代表早期、第Ⅱ类代表早中期、第Ⅲ类代表中晚期沉积物的粒度特征；以发育中、小型水平、平行、波状等层理和泥裂为主。Shatanzi bayou,formed of 'Ω'-shape river cove, is an open sedimentary system.The bayou underwent concave bank collapse,covex bank cumulation and cut-cove bar forming stages.Water inlet and outlet are the main positionsof deposition.The deposit rate is 2-3m per year,but that of the apex of the cove is considerably slow.As for grain size curves,type-Ⅰ represents the grain size of the early stage sediments;type-Ⅱ represents the grain size of the early to middle stage sediments and type-Ⅲ shows that of middle to late sediments.Small or medium size of horizontal,parallel and wave bedding and mud cracks developed in the bayou.

关 键 词：牛轭湖 现代沉积 形成模式 曲颈裁弯 

分 类 号：P512.3[天文地球—地质学]