准噶尔盆地南缘阿尔钦沟剖面八道湾组河道砂体构型

摘要

为了研究准噶尔盆地南缘阿尔钦沟剖面八道湾组辫状河道砂体沉积特征和构型划分,以沉积学与储集层构型的相关理论为指导,在野外露头进行观察与实测.该剖面八道湾组砂体主要发育11种岩石相,划分出6级层级界面,识别出4种构型要素类型,并建立了此露头储集层构型发育模式以及分布样式.研究发现,此剖面八道湾组砂体为2期辫状河道沉积叠置,砂体内部3级—6级层级界面不同程度地降低了储集层砂体的连通性,并加大了储集层的非均质性.加强露头研究,运用构型的方法解剖储集层,可以更好地分析储集层内部非均质性.%In order to study the sedimentary characteristics and to classify the architecture of braided channel sand body in Badaowan formation of Aerqingou section in the southern margin of Junggar basin,and guided by theories of sedimentology and reservoir architecture,field outcrop observation and measurement are conducted.In the sand bodies of Badaowan formation,11 lithofacies are found,boundaries with 6 levels are classified and 4 key elements of architecture are identified on Aerqingou section,based on which a reservoir architecture development model and its distribution patterns are established for the outcrop.The results show that the sand body results from depositional superimposition of 2 stages of braided channel events;3-level to 6-level boundaries within the sand body can reduce horizontal and vertical connectivities in different extent and increase reservoir heterogeneity.Enhanced outcrop study and using architectural methods to dissect reservoirs can help us better understand reservoir heterogeneity.