Identifying reservoir fluids by wavelet transform of well logs

The wavelet-transform (WT) method has been applied to log data to extract reservoir-fluid information. In addition to time (depth)/frequency analysis generally performed with the wavelet method, energy-spectral analysis for time-/frequency-domain signals was performed by the wavelet transform. Forty-two models from an oil field in China were studied with this method, and, subsequently, these rules were applied to interpret reservoir layers. It was found that identification by use of this method was in very good agreement with the results of well tests.