AAPG GEO 2010 Middle East
Geoscience Conference & Exhibition
Innovative Geoscience Solutions – Meeting Hydrocarbon Demand in Changing Times
March 7-10, 2010 – Manama, Bahrain
Wavelet Transform Modulus Maxima Lines Analysis of Seismic Data for Delineating Reservoir Fluids
(1) Geophysics, FSTGAT/USTHB, Khemis El Khechna, Algeria.
(2) Geophysics, Earth Physics Laboratory, Boumerdes, Algeria.
The main goal of the proposed idea is to use the wavelet transform modulus maxima lines (WTMM) method to delineate reservoir fluids. First a seismic seismogram is generated using the convolution of the Ricker wavelet with the reflectivity function calculated from the measured sonic and density well logs data.
Obtained seismogram is analyzed by the WTMM in order to calculate the singularities spectrum based on the direct Legendre transform of the spectrum of exponents.
Application of this technique at the real data of a borehole located in the Algerian Sahara is realized. Thus Singularities spectrum is estimated at corresponding depth of the following fluid types: Gas, Oil, Water, Gas-Oil and Oil-Water. Consequently, the obtained results allow taking a decision about the fluid nature containing the reservoirs rocks pores.
We have applied the proposed technique at two other boreholes, obtained results demonstrate that the wavelet transform modulus maxima lines technique can give more idea about hydrocarbon nature and can enhance reservoir characterization.
Keywords: WTMM , seismic seismogram, well logs, singularities Spectrum, hydrocarbon nature.