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.