摘要
通过野外露头观察与实测,对准噶尔盆地南缘石场剖面八道湾组沉积旋回特征进行了详细研究。该剖面八道湾组主要发育9种岩相,4种典型的岩相组合,分别代表扇三角洲平原辫状水道、扇三角洲前缘内带辫状分支水道、扇三角洲前缘外带水下分流河道及前扇三角洲席状砂沉积。八道湾组下部扇三角洲平原主要特征为多期辫状水道砂体垂向叠加的巨厚砂体,其顶底为厚层细粒遮挡层,辫状水道物性较好,是主要的储集砂体。石场剖面八道湾组可划分为2个长期旋回LSC1与LSC2,并细分为4个中期旋回以及若干短期旋回。在明确构造运动、可容纳空间及沉积物源等控制因素下,石场剖面八道湾组旋回可与四棵树河剖面八道湾组旋回进行对比。
With the guidance of sedimentology and high resolution sequence stratigraphy,a detailed study on the characteristics of fan delta deposits and cycles of Baodaowan formation in Shichang section in the southern margin of Junggar basin is conducted by means of the outcrop observation and measurement.The nine types of lithofacies and four kinds of typical lithofacies associations developed in the Badaowan formation respectively represent the braided channel of fan delta plain,the braided distributary channel of fan delta inner front,the underwater distributary channel of fan delta outer front and the sheet sand of pre-fan delta.The fan delta plain of Badaowan formation is characterized by that the sand bodies in multistage brai.ded channels of fan delta plain are vertically superposed into a thick sand body,in which the thick and fine grained barrier layers are deposited at the bottom and the top.The braided channels with better physical properties are the main reservoir sand bodies.In the outcrop,two long-term base-level cycles are identified,namely LSC1 and LSC2,and the Badaowan formation can be subdivided into four medium-term cycles and a number of short-term cycles.On the basis of control factors of the tectonic movement,accommodation and sedimentary provenance,the base-level cycles of Shichang section could be compared with that of Sikeshu River section.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2014年第5期536-541,共6页
Xinjiang Petroleum Geology
基金
国家科技重大专项(2011ZX05003-005)
关键词
准噶尔盆地南缘
八道湾组
扇三角洲
沉积特征
基准面旋回
southern margin of Junggar basin
Badaowan formation
fan delta
sedimentary feature
base-level cycle
