The Application Of NMR Mud Logging Technology In Evaluation Of The Reservoir Of Qi-40 Block In Huanxiling Oil Field

Nuclear Magnetic Resonance(NMR)mud logging technology came into oil logging industry from 1990 s.It provides us with new answers to many problems of hydrocarbon exploration and development in petroleum industry.NMR analysis is to measure the nuclear magnetic resonance signal of the core sample by making use of characteristics that nuclear magnetic resonance occurs in hydrogen atom under a extra magnetic field,and to obtain porosity,permeability,oil saturation,movable fluid saturation and other geological parameters.In 2004,Liaohe Oilfield Mud Logging Company transplanted the NMR logging methods to the field of NMR mud logging.NMR mud logging technology have realized the transfer of petrophysical analysis from laboratory to drilling site,and have advantages of simplicity,rapidity,low requirement for sampling,accessing to many parameters,high accuracy.In the aspect of reservoir evaluation and directing field drilling,NMR provides detailed reservoir physical parameters,it also has great meaning to exploration and development of oilfield.This paper makes use of analyzing the chromatograph charts and T2 relaxation spetra,and chooses four representative examples of Qi-40 block in LiaoHe Oilfield,evaluates the reservoir properties qualitatively and quantitatively on the base of analyzing reservoir physical characteristics.We map the crossplots according to the data of porosity,pemeability and oil saturation of twenty-two wells in Qi-40 block,and we fit the scatterplots in the retangular coordinate systems,and establish the reservoir evaluation of the interpretation standard and interpretation charts of Qi-40 block,then we delineate the area coverage of oil,gas,water layer,which can be applied in the exploration of oil wells in Qi-40 block in future.Finally,referring to the logging data,and comparing the data of porosity,permeability,oil saturation and the interpretation conclusion to those of logging interpretation sheet,they match very well,so confirming that the NMR technology is very accurate.