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Standard deviation function return the statistical standard deviation of all values in the set based on a sample of the population (STDEV), or based on a biased population (STDEVP). Standard deviation is useful for measuring variance within a data set and, in application, confidence in statistical results.
A method for gas-bearing reservoir identification using a local frequency constrained normalized w transform
PendingCN122260464AInhibition of cleavageStable main frequencySeismic signal processingFrequency spectrumComputational physics
The application discloses a normalized W transform method based on local frequency constraint and used for gas reservoir identification. The method firstly inputs a seismic signal, adopts total variation regularization combined with Bregman iteration to solve local frequency, and improves stability and noise resistance of frequency estimation; on the basis, a standard deviation function fusing local frequency constraint, frequency deviation suppression and amplitude adaptive adjustment is constructed, adaptive regulation and control of a W transform analysis window are realized, a time-varying main frequency normalization mechanism is introduced, and a high-resolution time-frequency spectrum is obtained; finally, at least two characteristic frequency points are selected based on energy accumulation distribution of the time-frequency spectrum, linear fitting is performed on the characteristic frequency points, a frequency attenuation gradient attribute is calculated, and the frequency attenuation gradient attribute is used for representing distribution characteristics of the gas reservoir.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY