The Well Logging Evaluation Study Of Low Porosity,Permeability And Saturation Reservoir In Sag Aer

Sag AER is a main exploration zone of ErLian oilfield in recent years.There are different kinds of reservoirs such as lithology,structure,sedimentary formation and buried hill.Because the lithology,porosity structure and oil distrbution are complex in this area,the formation pososity and permeablity are lower,the interpretation in this area is very difficult.Due to the content of debris and diagenesis,the reservoir anisotropism of sag AER is very strong,the relationship between porosity and permeability is complex,the different value of the core permeability which have similar porosity is up to 3 orders of magnitude,and the different value of the core porosity which have similar permeability is up to 10%.So the oil-bearing property of the reservoir can't be reflected by the oil saturation which is calculated by fixed m,n parameters.According to the oil saturation calculated by variable m,n,a parameters which is regressed by the core test,the variable m,n,a parameters calculated by NMR test is credible.This thesis also made further study for the evaluation method of pore structure with digital cores and improved the classification and effective assessment technique in low permeability reservoir.Then this thesis set up evaluation criteria and relevant evaluation chart for different regions and evaluate the capacity of the reservoir.This thesis build oil-water layer identification chart and interpretational criteria based on different blocks and zones,and evaluated the application effect of variable a,m,n oil saturation to improve the evaluation accuracy of oiliness in low porosity and low permeability reservoir.In this paper,the evaluation method of the nuclear magnetic resonance property is established,which can be used to evaluate the reservoir and check the physical property calculation of the conventional well logging.And this paper also formed the interpretation model,interpretation chart and evaluation standard of complex glutenite reservoir.This thesis built the porosity and permeability interpretation model,and lithology identification is made by using conventional logging data and natural gamma ray spectrum data.This thesis summarized the relationship between tuffaceous content and the distribution of lithology and oil/gas.In this paper,This thesis established the interpretation standard,and the resistivity and porosity cross plot technique is used to set up the interpretation standard of different group.This thesis also put forward suggestions for oil testing based on the results of fine interpretation.