Identification of gas in carbonate rock using wavelet transform
Subject Areas : PetrophysicsHassan Omrani 1 , Hashem omrani 2
1 - دانشگاه صنعت نفت دانشکده نفت اهواز
2 - islamic azad university
Keywords: Wavelet transform, petrophysical log, porosity, water saturation, gas identification in carbonate rock,
Abstract :
Gas can be diagnosed in clean sand rock by petrophysical log. It is not easy to determine the gas in carbonate rock by petrophysical log. The R.F.T. tool is used to determine the gas in carbonate rock. The fluid density in the rock is determined by calculating the pressure difference related to depth. The R.F.T. tool has some disadvantages, such as being expensive, taking much time to run, and rock having a neutron porosity of about 15%, and sometimes the R.F.T. tool is stuck in well. This study applies the wavelet transformation, a recent advance in signal analysis technique, to detect reservoir rock fluid. The porosity and water saturation are denoised using the "demy" mother wavelet. At last, the pore hydrocarbon saturation, porosity denoise by the "demy" wavelet, pore volume plot and R.F.T. tool are plotted together in one figure to identify the kind of fluid in sand and carbonate rocks.
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