Using Nuclear Magnetic Resonance Technology To Study And Identify The Oil And Water Layer Of Liaohe Basin

The Liaohe Basin is located in the south-central part of Liaoning Province,With the deepening of exploration,the relationship between oil and gas is becoming more and more complicated,and the requirements of oil and water layer evaluation technology are also increasing.The introduction of new technology of nuclear magnetic resonance,providing more comprehensive and accurate geological data on site for the exploration and development of the oil field.This article mainly research the application of oil and water layer identification with nuclear magnetic resonance technology in Liaohe basin,the study area are the eastern depression,the western depression and the Daimintun depression.The effective evaluation parameters were obtained according to the nuclear magnetic resonance T2 relaxation time spectrum.Combined with core analysis data of reservoir lithology,physical property and oil content characteristics and their mutual relations are analyzed.And conduct a preliminary identification of oil and water layer according to the characteristics of the spectrum to determine the nature of the reservoir.Select the nuclear logging parameters and combine with the test oil conclusion to establish oil and water layer evaluation interpretation plate.On this basis,the explanatory plates were established with the NMR data and the pyrolysis parameters which were determined by geochemical logging method,in order to eliminate the impact of crude oil on the identification of oil and water.In addition,the Fisher discriminant analysis method is used to establish the discriminant function model and achieve the classification of oil and water properties of the classification and evaluation.At last,the tested data points of the wells have been putting into the explanatory version and the discriminant function model to evaluate the application effect.The results show that the coincidence rate of the eastern sag is 83.3% and the western sag is 75% by using the nuclear magnetic resonance-pyrolysis method.Combining with the Fisher discriminant analysis,the coincidence rate is further improved,with the eastern depression increasing to 92.54% and the western sag increasing to 85.1%.