摘要
准噶尔盆地西北缘前陆冲断带二叠系佳木河组由火山岩、火山碎屑岩、碎屑岩组成,岩性复杂,彼此叠置。文中探讨了这种混合地层的层序划分方法,通过应用井震结合的桥式对比以及大量岩心的观察,确定了火山岩、碎屑岩都是史密斯地层,区域性的不整合面控制地层的发育,事件性的火山活动只是短期的活动,在地震上可以在三级层序格架内追踪对比。靠近前陆冲断带处发育斜坡带,从冲断带到盆地内,三级层序在斜坡上带厚,以火山岩为主,下带薄,以碎屑岩为主,并且在火山活动期,靠近断裂处以火山岩为主,火山静止期,以碎屑岩为主。
In the foreland thrust belt of northwestern margin of the Junggar Basin, the lava, lava clastic and clastic locks were all parts of Jiamuhe stratum in Permian of the areas. Different rocks are mixing and we researched this type of complex stratum. Through lots of cores viewed and synthetic made we thought mixing strata is Smith stratum; area unconformated surface controll the development of three--order sequence. The volcano action is short and we can tract the sequence boundary in the seismic section. Meanwhile, there is a slope between thrust belt and basin forward~ upper is full of thick lava and lava elastic, lower is full of thin elastic rocks. During the period of volcano action, close to fault belt lava developed mainly and in stable period sequence showed elastic rocks.
出处
《内蒙古石油化工》
CAS
2008年第14期54-57,共4页
Inner Mongolia Petrochemical Industry
基金
国家自然科学基金项目(No.40272057)
国家重点基础研究发展规划"973"项目(G19990433)
关键词
层序特征
发育演化
佳木河组
准噶尔盆地西北缘
Characteristics of Sequences
Evolution of Development
Jiamuhe Stratum
Northwestern Margin of the Junggar Basin
