摘要
依据陆相层序地层学原理及冲积体系的特殊性,借鉴高分辨率层序地层学中基准面旋回原理,通过研究可容空间增长速率与沉积物供给之间的关系,确定了各种条件下体系域和沉积体系的发育特点。认为:一个完整的层序应包括冲积充填体系域、水进体系域、水退体系域和河流体系域。但当剩余可容空间不足时,层序可不发育水进和水退体系域,只发育冲积充填体系域和河流体系域。顶部的河流体系域常因基准面的继续下降被剥蚀而难以保留。通过准东地区仓房沟群和小泉沟群的研究,确定了4个层序,层序A、D发育水进和水退体系域,而层序B、C发育冲积充填和河流体系域。
According to principle of continental sequence stratigraphy and specific property of alluvial system,ap plying principle about base-level cycle in high resolution sequence stratigraphy,this paper studied the relation between accommodating space growth rate and sedi -ment supply rate,by which the characteristics of system tract and deposit system in various conditions were defined.It is concluded that a complete set of sequences should consist of several system tracts such as alluvial filling,transgressive and regressive,and fluvial ones.Note that transgressive and regressive system tracts are not developed instead of alluvial filling and fluvial system tracts when remainder accommodation space is not enough;while upper fluvial system tract is hard to remain because of denudation from the continuous falling of datum lev-el.Furthermore,four sequences have been defined based on study of Cangfanggou and Xiaoquangou groups in east Junggar basin.In Se-quence A and D,transgressive and regressive system tracts are developed;in Sequence B and C,alluvial filling and fluvial system tracts de-veloped.
出处
《新疆石油地质》
CAS
CSCD
2003年第1期31-34,共4页
Xinjiang Petroleum Geology
