下第三系在构造背景、沉积环境等方面存在很大的差异，相应地划分为上、下两个超压系统。
The tectonic background and sedimentary environment are quite different between Paleogene and Neogene, and overpressure systems can be classified into lower and upper ones correspodently.
持续生烃和压实封闭是普遍超压的主因，现代地压状况是晚期构造改造的结果。
The superpressures mainly result from sustained hydrocarbon-generation and compaction seal and the current geopressure circumstances are the result caused by late tectonic movements.
前人认为超压的形成主要受控于构造挤压作用 ，此外还有高压天然气的注入、构造抬升等因素 ，基本不存在欠压实作用。
Research on inclusions and mudstone compaction curves shows that uncompaction and structural compression are the main factors resulting in abnormal high pressure in Early Cretaceous gas reservoirs.
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