Research On Logging Evaluation Method For Low Saturation Reservoir In Lixian Slope

With the deepening of the global oil and gas exploration and development,low oil saturation reservoir has attracted extensive attention.At present,the identification and evaluation of oil and gas reservoirs with low oil saturation is a common problem in the field of logging interpretation.Because of the complex logging response characteristics of low saturation reservoir,it is difficult to identify the fluid properties and evaluate the productivity of oil and water layers.In order to improve the accuracy of logging interpretation,to evaluate the reservoir difficulty,this paper takes Lixian Slope of low oil saturation of reservoir as the research object to carry out research on the evaluation method of low saturation reservoir in Lixian Slope.Through the analysis of logging in Lixian Slope of low saturation reservoir response characteristics of influencing factors,based on the rock electricity,coring,mercury and other experimental data,by studying reservoir four relations,sum up the formation of low oil saturation of oil and gas reservoirs with low amplitude,fine particles and the particle size distribution of rock concentrated,high bound water saturation,low permeability and complex pore structure and other factors.On the premise of petrophysical analysis,the quantitative interpretation model of reservoir parameters such as porosity and permeability is established by using the log response curve which can reflect the reservoir characteristics.This combination of rock electric experiment data and mercury injection experiment data,calculation of water saturation is given Archie formula,Simandoux formula and capillary pressure method,the average Archie formula and the capillary pressure method of water saturation in the high resistance of the value,the average value of the calculated water saturation in low resistivity section of Simandoux formula and capillary pressure method.In the evaluation of low oil saturation,fluid properties and productivity evaluation,combined with the oil and water features are qualitatively explained by single well and multi wells,planar distribution and other forms,a fluid identification method based on the calcium content,the formation of oil and water layer identification method and productivity evaluation method based on array induction and NMR logging led,set up the capacity evaluation of the combination of array induction and pore structure of the standard.The practical application shows that the method presented in this paper can be applied to the logging evaluation of the low saturation reservoir in Lixian Slope,which improves the accuracy of logging interpretation.