Abstract: In view of the problems of Qilicun oilfield,such as low vertical resolution of conventional logs,inaccurate response to thin oil layers and thin oil leakage of reservoir interpretation,based on the influencing analysis of thin oil layers on conventional logging response characteristics,the sensitive logging curve of thin layers has been determined.Through the vertical resolution analysis of Walsh inversion method,resolution matching method and the Fourier spectrum method,the Fourier spectrum method is an effective method to improve vertical resolution.The logging curve after measurement of the Fourier spectrum method can effectively reflect the true message of the formation.