The Disposal of Tailed Peak in the Time Spectrum of Pulsed Neutron Oxygen Activation Logging

摘要

In the time spectrum of impulse oxygen activation logging, grave tailed peak occurs when the viscosity of polymer is high and the velocity of the flow is not even. The calculation of transit time, flow velocity as well as flow volume depends on the duration of the oxygen activation peak, so the disposal of the grave tailed peak in the time spectrum of impulse oxygen activation logging is critical. And an effective way to deal with tailed peak will improve the calculation accuracy of transit time and flow velocity. In this paper, the problem of tailed peak is studied, then an algorithm combining Logarithmic transformation and Gaussian function, which is used to deal with tailed peaks in the time spectrum of water flow of pulsed neutron oxygen activation logging, is proposed. Gaussian function is used to describe tailed peaks in the time spectrum of water flow of pulsed neutron oxygen activation logging in the logarithm space. Case analysis shows that the disposal effect of the algorithm is good, effectively eliminating the redundant data of the tailed peak in the flow time spectrum of pulsed neutron oxygen activation logging. The algorithm is a practicable method to deal with the tailed peak in the flow time spectrum of pulsed neutron oxygen activation logging.