关键词: 原生油气藏, 油气系统, 古生界, 华北地区, 油气远景

Abstract: The Palaeozoic petroleum geological condition of Huabei area had been analyzed in detail from the petroliferous system angle.The Lower Palaeozoic is mainly a set of marine carbonate rocks,and the soruce rocks located in the sag region has large potential,such as the Cambrian Fujunshan and Zhangxia formations and the Ordovician Majiagou and Fengfeng formations in the section.The Huanghua-Linqing structural belt is the favorable exploration region.The Upper Palaeozoic is mainly a set of coal measure sediments with the characteristics of large thickness of coal and dark mud bed with mature-overmature evolutionary degree,so that,the upper Palaeozoic has large potential as well.Based on the hydrocarbon generation history of Palaeozoic source rocks and the interrelations between the migration and accumulation of oil and gas,it has been identified that the Palaeozoic has the condition of forming the primary oil and gas pools.The key problems of the Palaeozoic prospect are the potential of secondary hydrocarbon generation,distribution range of source rocks and preserve condition of oil and gas.The Palaeozoic petroliferous property had been studied based on a large amount of basic geological informations and the conclusions had been obtained that the Bohaiwan area is a favorable Palaeozoic oil and gas prospect place with good secondary hydrocarbon generation and petroleum preserve conditions.The southern Nanbei area is a good Palaeozoic gas prospect place with good hydrocarbon generation and petroleum preserve condition,but high evolutionany degree of source rocks,and the Qinshui area is not an ideal place for the Palaeozoic petroleum prospect becausa of the strong hydrodynamic and poor petroleum preserve condition.

Key words: primary oil and gas pool, petroliferous system, Palaeozoic era, Huabei area, hydrocarbon potential