Deep basin reservoir in Songliao Basin

Abstract

According to the formative mechanism of deep basin gas,the pool-forming mechanism of Fu-yang oil layer in Songliao Basin was studied from the aspects of depositional reservoir character,overpressure of source rock,power of hydrocarbon migration and hydrocarbon distribution.The paper argues that the widely distributed low-permeability reservoirs are different from the conventional lithological reservoir and belong to deep basin reservoir: sandstones are continuously distributed in the whole basin,reservoirs are compact in the depression area;oil sources are abundant and with overpressure as the major driving force of hydrocarbon expulsion;the phenomenon of oil underlying water exists;oil layers of low production rate are widely distributed,there are local economical exploration areas with reservoirs of great thicknesses and good properties.The deep basin reservoir pool-forming pattern of Fu-yang oil layer is established,by which a great resource potential is forecasted in the deep basin reservoirs.The adjustment of exploration strategies is suggested.