The Study Of Diagenesis On Fuyu Reservoir Of Da An Oil Field

In order to study the formation mechanism sandstone reservoirs with low permeability and ultra-low permeability, this paper has researched on diagenesis of reservoir with compact sand rock on the FuYu oil layer of Da An oil field. On the basis of predecessors’ research results, the study, through core observation, systematic sampling, Microscopic analysis and chemical analysis combined with a focus on sampling, has analyzed the petrologic features in terms of rock types of reservoir, physical property and microstructure etc. On this basis, the paper has studied the diagenesis and the influence of varies diagenesis on compact sand rock;On the foundation of 6 diagenetic mark, such as the palaeogeothermal, organic matter maturity, the lithogenous phase has been concluded with Rock stage A and B; diagenetic evolution model is established; the diagenesis influence of reservoir with compact sand rock has been discussed, specially on the control effect on the reservoir space,combined with construction and sedimentary. According to the level of diagenesis, 4 types of lithogenous phase has been divided: strong secondary pore dissolution diagenetic reservoir facies, weak, cementation in mixed pore diagenetic reservoir facies, crush real- secondary cementing narrow intergranular Kong Chengyan reservoir facies and carbonate cementation diagenetic reservoir facies, then the attribution mode has been conclude.