摘要
对库车坳陷白垩系巴什基奇克组露头一个扇三角洲准层序的结构进行了精细解剖 ,认为该准层序为扇三角洲前缘沉积 ,可划分为 5个单砂体 ,不同成因的砂体类型和隔夹层类型的形态和规模不同。该准层序自下而上粒度明显变细 ,岩性呈砾岩 -砂岩 -泥岩变化 ,砂体成因类型表现为砾质水下分流河道→砂质水下分流河道→席状砂的沉积序列 ,且属于基准面上升准层序 ,其形成过程受基准面变化的控制。
Based on the data collected in the field, this paper described in detail the structural characters of a fan-delta penesequence of Bashijiqike Formation of Cretaceous,in the Kuche Depression. This penesequence was made up of fan-delta front sediment,and contained 5 sandbodies. Different genetic sandbodies and interbeds possessed different shape and size. The grain size of the penesequence became fine from bottom to top,as its lithology changed from conglomerate to sandstone and mudstone.The genetic types of sandbody ranged from gravelly subaqueous distributary channals to sandy subaqueous distributary channals and to sheet-shape-sandbodies. This parasequence is of the base-level-rising type and its formation was controlled by base-level change.
出处
《矿物岩石》
CAS
CSCD
北大核心
2003年第2期87-89,共3页
Mineralogy and Petrology
