According to those analysis and the background of geological evolution of basin , the kind of hydrodynamics was regarded as compaction before y3 and then as compaction - osmosis after y3 . futhermore , the key time of oil and gas reservoir formation was summarized , it is furthermore , the main cause of high pressure formation was believed that the compaction was not enough in paleogeothermal gradient , meanwhile , analyzing the cause of the low pressure nowadays , it was the uplift and erosion of stratum or pressure divulgence because of seal and so on 另外,還確定油氣成藏的關(guān)鍵時期為伊敏組沉積末。再者,認(rèn)為欠壓實(shí)是最大埋深狀態(tài)下,超壓形成的主要原因,同時分析了形成現(xiàn)今負(fù)(低)壓的原因,其原因為地層抬升剝蝕、壓力因封閉層的泄漏等。最后,恢復(fù)出各主要目的層的古流體勢的演化歷史,從伊敏組末至現(xiàn)今,油勢分布特征具有較好的繼承性。