火成岩油气藏成藏机理探讨

本文以济阳坳陷罗151块火成岩油气藏为例，通过对侵入岩体围岩的生油条件、辉绿岩体储集空间及油气运移与圈闭形成的时空配置关系等方面的研究，综合岩心、地球物理及试油等方面的资料，具体阐述了罗151块火成岩油气藏的特点及成藏模式。研究表明，火成岩作为一种特殊类型的油气储集层，形成具工业价值油气藏须具备一定的石油地质条件：充足的石油来源、有利的生储盖组合、由裂缝—孔隙系统构成的储集空间、有效的圈闭（圈闭形成时间与油气运移时间的相互关系、圈闭位置与油源区的空间关系）及必要的保存条件等；但由于火成岩油气藏储集空间类型复杂、成因多样，其平面及纵向储层非均质性差异极大，开展对不同类型火成岩储集层储集空间成因研究，是解决减小火成岩油气藏勘探风险及合理布置开发井网问题的关键。

A Discussion on Formation Mechanism of Petroleum Pools in Igneous Rocks

Through analyses of oil source around the igneous rock intrusive bo dies, the reservoir spaces of diabase, time space arrangement relationship of t rap f ormation to the migration of hydrocarbons, the characteristics and pool forming m odel of igneous rock reservoir in the Luo 151 block, Jiyang sag, are described i n this paper. By integration of the core, geophysical and production test data, the studies indicate th at igneous rocks can be of certain industrial values as a special kind of petrol e um reservoirs. Some petroleum geological conditions are essential to pool format ion: ample petroleum sources, favorable source reservoir caprock association reservoir spaces formed by fissures and pores efficient traps, w hic h depend on the relationships between the time of petroleum migration and trap formation, location of traps and petroleum source areas, and the preservation co nditions . Taking the Luo 151 igneous rock block in Jiyang sag as an example, this paper descri bes the characters of the igneous rock pools and their formation mechanism. As t he genetic types of reservoir spaces are complex and very different from each other, the heterogeneity of the reservoirs is strong. The r e search on the genetic types of reservoir spaces is very important in oil and gas exploration and development.