层序地层框架下的含油气系统--以查干凹陷下白垩统为例

将含油气系统思想与层序地层分析方法紧密结合，以查干凹陷为例详细解剖，形成了一套以层序地层分析为基础、含油气系统为核心、采用定性与定量研究相结合的方法体系：首先，在查干凹陷层序地层格架建立的基础上进行了密集段解释及沉积体系、体系域展布研究，解剖了目的层的静态地质要素发育的地质背案、分布规律及其特征；然后，应用盆地模拟技术等多种手段，模拟了圈闭的形成及油气生成—运移—聚集等动态地质作用过程；最后，通过油气系统预测模式的建立和评价，分析了静态地质要素与动态地质作用过程的匹配关系，指出了查干凹陷的油气有利勘探区带和目标。

Petroleum System Based on Sequence Stratigraphic Setting: a case study on Lower Cretaceous in Chagan Sag

Combining petroleum system idea and sequence stratigraphic method together,and taking Chagan Sag as an example,this paper provides a new method system which is based on sequence stratigraphy,considering petroleum system as a core,and combining qualitative and quantitative study together.First,based on constructing sequential stratigraphic framework of Chagan Sag,it performs closely packed segments interpretation and studies sedimentary systems and system fields extension,and analyzes geologic background,distribution rules and characteristics of static geologic elements.Second,it simulates the processes of trap formation and oil and gas generation-migration-accumulation using basin simulation technique.Finally,it analyzes the matching relation between static geologic elements and dynamic geologic process through constructing and evaluating prediction pattern of petroleum system,and determines favorable exploration areas in Chagan Sag.