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鄂尔多斯盆地是我国大型含油气盆地,三叠系延长组是其中主要的含油气层,然而关于其层序地层格架的研究一直未有定论。延长组作为一个完整的构造层序,其Ⅲ级层序(长期基准面旋回)的划分,有三分、四分、五分及六分等几种方案。综述前人研究成果,并比较了各种划分方案的异同,指出为统一延长组Ⅲ级层序(长期基准面旋回)划分方案,研究中应注意以下问题:1)明确方法理论,不可混淆经典层序地层理论与高分辨率层序地层理论概念及术语;2)运用不同理论层序可能有不同界面划分结果,但湖泛(旋回)次数应当对应;3)不同地区层序界面所处层位可以不同;4)盆地存在西南陡坡和东北缓坡两种边缘,可能发育不同层序类型;5)应积极探索新方法和新技术,推进沉积层序定量划分。
The Ordos Basin is a large petroliferous basin in China. The Triassic Yanchang Formation is one of the major oil-bearing formations in the Ordos Basin. However, the study on its sequence stratigraphy has not been finalized. Yanchang Formation as a complete structural sequence, the Ⅲ-level sequence (long-term reference plane cycle) division, there are three, four, five and six and other programs. The previous research results are summarized and the similarities and differences of various schemes are compared. It is pointed out that in order to unify the scheme of class Ⅲ sequence (long-term reference cycle), we should pay attention to the following questions: 1) Define the method theory, Sequence stratigraphy theory and high-resolution sequence stratigraphy theory concepts and terminology; 2) The use of different theoretical sequence may have different interface results, but the number of lake pan (cycle) should correspond; 3) 4) There are two types of edges in the basin: southwest steep slope and northeastern gentle slope, and different types of sequences may develop. 5) New methods and new technologies should be actively explored to promote the quantitative division of sedimentary sequence.