Research On The Volcanic Rock Reservoir Characteristics Of Oulituozi Oilfield In Eastern Sag Of Liaohe Basin

Through the observation of drill core, the identification of ordinary and casting sand flake, and the comprehensive research of logging and geophysical information of the three section in Shahejie formation of Oulituozi Oilfield in eastern sag of Liaohe basin, the essay analyzed stratigraphic sequence, volcanic rock lithology,volcanic rock facies, reservoir space of research segment and so on, finally evaluated volcanic rock reservoirs of research segment.The research can offer theoretical basis for exploration and development of Oulituozi Oilfield.The research shows that Oulituozi Oilfield grows lava and pyroclastic rock.According to the structure characteristics, lava can divide into basalt and trachyte two kinds ,pyroclastic rock can divide into tuff and sed pyroclatic rock two kinds, the mainly type is trachyte. The volcanic rock in this area is divided into explosive facies, extrusive facies, volcano channels facies, intrusive facies and volcano sedimentary facies 4 facies and 13 intrafacies. Explosive facies and extrusive facies which has Wide distribution and good physical properties, is the favorable reservoir facies Ou48 well is the most development of explosive facies;Ou29, Ou45,Ou52 wells etc is the most development of extrusive facies,Ou28 well is the most development of volcano sedimentary facies. On the basis of genesis, we can divide reservoir space into primary reservoir space and secondary reservoir space two kinds. Primary reservoir space mainly include air hole, inte-breccia pores, inter-crystal pores and contraction fissures, secondary reservoir space mainly include corrosion pores and tectonic fissures. Ou19 well is the most development of air hole, Ou29 well is the most development of inter-crystal pores and corrosion pores. The porosity and permeability in this area is no obvious correlation, The connectivity of Volcanic reservoir space is poor,the anisotropy is strong. The research shows that nearly crater overflow facies and fissures development area just can form high quality reservoirs, far crater overflow facies and fissures have certain development area has the potential to develop secondary reservoir, fissures no development area is the poor reservoir belt.