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在潘诺尼亚盆地具有良好储层特征的上新世沉积中发现了大量油气。上新世沉积属于三角洲相,在0.5～2km深处有大量的未熟源岩。由于生烃和二次运移的条件悬殊,上新世储层中所聚集的油气来源也极不相同。本文的目的是确定上新世储层所圈闭油气的来源,从而描述运移及聚集系统。对不同地区油气地化特征检验的结果表明,上新世储层中不但有经细菌和早期热解过程在原地生成的干气,还有垂向运移来的富烃的石油伴生湿气,以及从地壳高温区或火山体中生成的富CO_2天然气。
A large amount of oil and gas was found in the Pliocene sediments with good reservoir characteristics in the Panonian Basin. The Pliocene sediments are deltaic facies with a large number of immature rocks located in depths of 0.5-2 km. Owing to the poor conditions of hydrocarbon generation and secondary migration, the sources of oil and gas accumulated in the Pliocene are also very different. The purpose of this paper is to determine the source of trapped hydrocarbons in the Pliocene reservoir and to describe the migration and accumulation systems. The results of the test of the characteristics of oil and gas geochemistry in different regions show that the Pliocene reservoirs not only have the dry gas generated in situ by bacteria and early pyrolysis but also the hydrocarbon-bearing moisture accompanying vertical migration, As well as CO 2 rich natural gas generated from high crustal or volcanic bodies.