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水进、水退控制的进积、退积以及加积等充填样式和它们在空间上的叠置方式,是断陷湖盆层序划分的主要依据。因此,幕式构造沉降作用引起的沉积基面变化是控制层序发育及其基本特征的根本原因,沉积物供给和气候变化只是层序形成的外部条件。运用上述方法可将高尚堡油田沙河街组三段二、三亚段划分为9个副层序组和若干个副层序,极大地提高了地层划分和对比的精度。
The waterflooding and waterflooding control are the main basis for the delineation of sequence stratigraphy in the fault-depression lake basin. Therefore, the change of sedimentary basement induced by the subsidence of the curtain structure is the fundamental reason for the control of the sequence development and its basic features. Sediment supply and climate change are just the external conditions for the formation of the sequence. Using the above method, the second and third sub-sections of Shahejie Formation in the Gaoshangpu Oilfield can be divided into nine secondary sequence groups and several secondary sequences, which greatly improves the precision of stratigraphic division and comparison.