安达断陷深部层序地层学及烃源岩特征

THE SEQUENCE STRATIGRAPHY AND THE CHARACTER OF HYDROCARBON SOURCE ROCK IN DEEP PART OF ANDA FAULT DEPRESSION

安达断陷深部包括由一系列陆相沉积相夹火山岩组成的沙河子组、营城组和登娄库组三套地层 ,发育于盆地形成的断陷期和断坳转化期。按层序地层学原理将其划分为断陷超层序和断坳转化超层序。断陷超层序中发育层序Ⅰ ,断坳转化超层序中发育层序Ⅱ和层序Ⅲ。本区的主要烃源岩有两种类型

The deep part of Anda fault depression incluses Shahezi formation , Yingcheng formation and Denglouku formation. The three formations are formed in the stage of fault and fault depression transformtion. They are consisted of a series of terrestrial sedimentary rocks with volcanic rocks. According to the rule of sequence stratigraphy, the three formations can be divided into fault depression super sequence. fault depression transform super sequence. The sequence Ⅰ is developed in fault depression super sequence and the sequence Ⅱ and sequence Ⅲ and developed in the fault depression transform super sequence. There are two kinds of hydrocarbon source rock in this region: one is the deep lacustrine dark mudstone on the top of the sequence Ⅲ and another is swamp deposits in Yingcheng formation.