摘要
对准噶尔南缘郝家沟剖面下侏罗统三工河组的沉积相与层序地层特征进行了详细的研究,确认三工河组发育辫状河三角洲沉积。辫状河三角洲包括辫状河三角洲平原亚相、辫状河三角洲前缘亚相和前辫状河三角洲亚相。辫状河三角洲前缘亚相又可进一步划分为水下分流河道、水下分流河道间、席状砂和河口坝等微相类型。三工河组辫状河三角洲沉积除一些层位的辫状河道沉积物颗粒较粗外,主体沉积物以砂岩、粉砂岩和泥岩为主,为砂质辫状河三角洲。运用高分辨率层序地层学基准面旋回划分原理,将三工河组划分为2个中期基准面旋回,下部中期基准面旋回又可划分为4个短期基准面旋回,上部中期基准面旋回发育不完整。
The sedimentary facies and high-resolution sequence stratigraphy of the Lower Jurassic Sangonghe Formation in the southern part of the Junggar Basin are discussed. It is believed that there are typical deposits of braided-river delta in the Sangonghe Formation. The braided-river delta can be divided into three subfacies. They are braided-river deltaic plain subfacies, braided-river deltaic front subfacies and pro-braided-river delta subfa- cies. Almost all deposits of the braided-river delta are finer clastic rocks including sandstone, silty sandstone and mudstone, except that a few beds of coarse deposits occur in braided-river channel microfacies. The Sangonghe Formation can be divided into 2 middle-term base-level cycles： MSC1 and MSC2 The MSClcan be subdivided into 4 short-term base-level cycles： SSC1, SSC2, SSC3and SSC4; and the MSC2 develops incompletely.
出处
《现代地质》
CAS
CSCD
北大核心
2006年第1期77-85,共9页
Geoscience
基金
国家自然科学基金项目(40172014)
中国石油勘探开发研究院"三角洲沉积模式与高层序分辨地层格架"项目
关键词
辫状河三角洲
高分辨层序地层学
下侏罗统
准噶尔盆地南缘
三工河组
基准面旋回
braided-river delta
high-resolution sequence stratigraphy
Lower Jurassic
the Junggar Basin
the Sangonghe Formation
base-level cycle
作者简介
刘智荣，女，博士研究生，1978年出生，古生物学与地层学专业，主要从事高分辨率综合地层学和沉积学研究工作。
