摘要
在恢复乌里雅斯太凹陷南洼早白垩世古地貌的基础上,分析了调节构造—坡折带特征与沉积体系和储集层分布的关系。结果表明:该复合型构造组合对砂体形态和储集层分布具有控制作用。研究区发育调节构造—上坡折、调节构造—中坡折和调节构造—下坡折,平面上呈北北东向展布。调节构造—坡折带控制沉积体系的发育,形成大规模扇三角洲—湖底扇沉积体系;调节构造—坡折带也控制砂体的形态,形成了7个呈舌状分布的小型湖底扇砂体;多级坡折带提供沉积物堆积的空间,调节构造对物源和水系也具有控制作用。在调节构造—坡折带的控制作用下,南洼储集体类型主要为扇三角洲前缘和湖底扇砂体,且不同级别的复合构造的储集体类型和物性存在差异。
Based on restoration of the Early Cretaceous palaeogeomorphology of southern subsag of Uliastai Sag, researches have been carried out on the relationship between characteristics of fault accommodation structure-slope break zone, depositional systems, and reservoir distribution. The analyses show that the compound structural assemblage controls the shape of sandbody and reservoir distribution. There are accommodation structure-upper slope break, middle slope break and lower slope break spreading in NNE direction in southern subsag in the study area during the Early Cretaceous. The accommodation structure-slope break zone controls the formation of depositional systems. There are large-scaled fan delta--sublacustrine fan depositional system; The accommodation structure-slope break zone controls shapes of sand- bodies, mainly seven small-scaled sublacustrine fan sandbodies were distributed in a tongue-like shape. Multistage slope breaks provide spaces for sediments deposition. The accommodation structure also controls provenance and drainage system, the major reservoir types are fan delta front and sublacustrine fan sandbodies controlled by the accommodation structure-slope break zone in southern subsag of the Uliastai Sag. The compound structure with different orders lead to the differences of reservoir types and their petrophysical property.
出处
《古地理学报》
CAS
CSCD
北大核心
2009年第5期573-580,共8页
Journal of Palaeogeography：Chinese Edition
关键词
二连盆地
乌里雅斯太凹陷
调节构造-坡折带
沉积体系
储集层分布
Erlian Basin, Uliastai Sag, accommodation structure-slope break zone, depositional system, reservoir distribution
