Conglomerate reservoir characteristics of lower Kexia formation in Liuzhong area of Karamay oilfield

The study of alluvial fan conglomerate reservoir diagenesis,diagenetic stages and sequences of lower Kexia formation in Liuzhong area of Karamay oilfield uses the slice observation cathodoluminescence,electron microscopy scanning technology,combining with the porosity,permeability and other methods.The results showed that compaction,cementation,dissolution and metasomatism are the main diagenesis types in the target area,where dissolution is the key factor to improve the performance of reservoir.The stratigraphic of study area has experienced early diagenetic stage A stage,early diagenetic stage B,which is currently in the middle diagenetic stage A period,crude oil generation phase.Reservoir pore space evolution closely related to a variety of diagenesis.The residual intergranular pores after compaction and cementation,the formation of intergranular dissolution pores and intergranular corrosion holes are the major oil and gas storage types,micro-cracks and fissures are the main migration pathways.Reservoir performance is mainly controlled by sedimentary and diagenetic.The results of the study predict the remaining oil distribution in the study area,provide geological basis for improving reservoir development effect.