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临清坳陷历经多次构造运动,形成了一个比较典型的叠合盆地。研究表明,该区上古生界石炭—二叠系煤系烃源岩是一套较优质烃源岩,其生烃演化主要受盆地的发育史控制,主要经历了早—中三叠世、早白垩世、古近纪和新近纪—第四纪共4期生烃过程,每期生烃均起始于叠合盆地拗陷沉积阶段,终止于构造抬升剥蚀阶段,第1期由于烃源岩演化程度低生烃量可以忽略不计。流体包裹体样品系统分析成果揭示,石炭—二叠系烃源岩分别在早白垩世、古近纪和新近纪—第四纪发生了3期以天然气充注为主的油气成藏过程,第1期、第2期充注的油气几乎全被破坏,以第3期即新近纪—第四纪晚期充注的天然气成藏为主。油气成藏时期的确定为该区“近源下洼,晚期为主”勘探思路的确立提供了理论依据。
After several tectonic movements in Linqing Depression, a typical superimposed basin has been formed. The study shows that the Upper Paleozoic Carboniferous-Permian coal measure source rocks in this area are a set of relatively high quality source rocks whose hydrocarbon generation and evolution are mainly controlled by the development history of the basin, which mainly experienced the processes of early-middle Triassic, early Cretaceous, Paleogene, and Neogene-Quaternary. All of the hydrocarbon generation started in the sedimentary stage of the depression in the superimposed basin and ended in the tectonic uplifting and denudation stage. In the first stage, due to the evolution of source rocks Low hydrocarbon generation can be neglected. The results of fluid inclusion sample system analysis reveal that three stages of hydrocarbon accumulation in the Carboniferous-Permian source rocks occurred during the Early Cretaceous, Paleogene and Neogene-Quaternary, respectively. The first and second periods of oil and gas filling were almost completely destroyed. The third period was the accumulation of natural gas charged in the late Neogene and Quaternary periods. The determination of hydrocarbon accumulation period provides the theoretical basis for the establishment of exploration ideas in the area “near source depression, late stage”.