孔西潜山奥陶系原生油藏成藏时期探讨

黄骅坳陷孔西潜山发现奥陶系（孔古3井、孔古7井）低产原生油藏和石炭-二叠系原生油气藏（孔古4井），油源对比结果证明，前者原油主要源于中奥陶统马家沟组灰岩，后者油气主要源于石炭系太原组及二叠系山西组煤系泥岩。根据孔古3井油藏的两期流体包裹体及储集层自生伊利石K-Ar年龄测定结果，油藏属两期成藏，第一期为晚三叠世（距今222.51～240.34Ma），第二期为第三纪，以晚第三纪为主。

An approach to the timing formation for primary oil pools of Ordorvician system in Kongxi buried hill

Primary oil pool of Ordovician system (at Well Konggu3 and Well Konggu7) and primary oil and gas pools of Carboniferous Permian system (at Well Konggu 4) were found in Kongxi buried hill of Huanghua depression. The result of oil source correlation shows that the first kind of oil mainly sourced from limestone of Majiagou Formation of Middle Ordovician, and the latter mainly from mudstone of coal measure strata of Taiyuan Formation of Carboniferous system and Shanxi Formation of Permian system. According to the K Ar isotope data of authigenic illite and the measure of two period fluid inclussion of the reservoir of Well Konggu 3, the oil pool formed in two periods, which are late Triassic (about 222.51 to 240.34 Ma ago) and Tertiary (mainly late Tertiary).