A logging interpretation model of physical property parameters confined by diagenetic facies of low-permeability reservoirs in Gaoyou sag

It is very important and difficult to more accurately determine physical property parameters of low-permeability reservoirs on conditions of the existing accuracy of logging data.For the sake of improving the logging interpretation accuracy of physical property parameters of low-permeability reservoirs and providing high-accuracy parameters for numerical simulation and reservoir evaluation,we took low-permeability reservoirs of Member Fu-1 of Funing Formation in the south fault terrace of Gaoyou sag as an example,examined controlling factors of reservoir physical properties and identified digenetic fancies that significantly affect physical property parameters of reservoirs in the study area.Diagenetic facies were determined by means of casting thin sections,scanning electron microscope and other information,and then according to these determined diagenetic facies,characteristics of logging curves of various diagenetic facies were investigated so as to establish a quantitative identification criterion,which offers the precondition for interpreting reservoir physical property parameters by digenetic facies.Various interpretation models of physical property parameters for different digenetic facies were set up by means of cores and logging curves,and the error analysis was carried out by examining cored wells.The results showed that the interpretation accuracy of reservoir physical property parameters is improved greatly and the approach to establishing an interpretation model of physical property parameters confined by diagenetic facies is effective.