摘要
柴达木盆地跃进四号古新统—中新统为一个完整的水退—水进—水退的一级层序,自下而上为一完整的粗—细—粗沉积旋回,其内部可进一步划分出3个二级层序。根据古生物、沉积构造、粒度、地球化学及岩性和电性特征,研究区主要发育浅湖、滨湖、三角洲平原和三角洲前缘等4个亚相,进一步可划分为泥坪、灰泥坪、泥灰坪、藻丘、分支河道、分支间洼和决口扇等6个微相。第一层序和第二层序受Ⅶ、Ⅷ号断裂影响十分明显,上下盘沉积和储集层物性差异性较强,有利储集层主要集中在断层上盘。
The Paleoeene-Neocene in Yuejinsihao in Qaidam basin is a complete cycle of first-grade sequence, with coarse-fine-coarse grain sizes from the top to the bottom, and c, an be further divided into three secondary-grade sequences. According to related paleontology, sedimentary structure, grain size, geochemical, lithologic and electrical characteristics, four subacies in this area could be recognized, such as shallow lake, shore lake, delta plain and delta front. Accordingly, six microfacies can be classified, including mud fiat, lime mud fiat, marl fiat, algal hill, branch channel, branch inter-sag and splay. The first and second sequences in the secondary-grade one are obviously influenced by Faults No. VII and No.VⅢ, and deposits and reservoir physical property of the upthrow and downthrow have great differences, so the favorable reservoirs could he distributed in the upthrow.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2013年第1期53-55,共3页
Xinjiang Petroleum Geology
关键词
柴达木盆地
新生界
层序地层
沉积相
沉积构造
Qaidam basin
Cenozoic
sequence stratigraphy
sedimentary facies
sedimentary structure
