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Identification of Stratigraphic Boundaries of a Well Using Wavelet and Fourier Transform
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 81st EAGE Conference and Exhibition 2019, Jun 2019, Volume 2019, p.1 - 5
Abstract
Reservoir rocks of Cambay basin, India play a significant role in producing commercial hydrocarbons. From middle Eocene to Paleocene there are seven formations exist in the area in which Post Kand formation on top and Olpad formation on the bottom. The Kalol formation of this sedimentary reservoir is small thickness and sandwiched between coal and shale is the major hydrocarbon producing of the area. Recognition of stratigraphic boundaries between formations using well log data is very challenging and crucial part of hydrocarbon exploration in the petroleum industries. In case of noisy well log data, the conventional techniques may mislead to pick the exact stratigraphic boundaries. Continuous Wavelet Transform can be used for zonation of well log signal according to the number of facies present across borehole in the reservoir. In the present study, we used combined application of Discrete Wavelet Transform and Fourier Transform to natural gamma ray log signal which clearly decipher the different facies. Each facies is represented by a separate curve waveform and sharp changes between waveforms reflect the stratigraphic boundaries.