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Title

APPLICATION OF SEQUENTIAL GAUSSIAN SIMULATION METHOD IN POROSITY MODELING OF BALAL OILFIELD USING SEISMIC AND WELL DATA

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Abstract

 BALAL IS AN OIL FIELD IN THE MIDDLE OF PERSIAN GULF; IT HAS THREE MAIN RESERVOIRS: SARVAK, DARIYAN AND ARAB FORMATIONS. WE USED GEOSTATISTICAL METHODS TO CHARACTERIZE RESERVOIR ARAB. SEQUENTIAL GAUSSIAN SIMULATION HELPED US INTEGRATE THE WELL LOG AND SEISMIC DATA TO MAKE POROSITY MAP OF THE RESERVOIR. WE FIRST INVERTED THE SEISMIC CUBE USING THE INITIAL MODEL, RE-SAMPLING IT INTO THE RESERVOIR GRID. FOLLOWING THIS, WE MADE VELOCITY MODEL AND THEN DEPTH CONVERTING THE CUBE. WE USED ACOUSTIC IMPEDANCE AS THE SECONDARY VARIABLE IN SGS METHOD. FOR THIS, AFTER REMOVING TRENDS FROM POROSITY AND ACOUSTIC IMPEDANCE DATA, WE NORMALIZED THE DATA SO THEY COULD BE USED BY THE SGS METHOD. SINCE STOCHASTIC METHODS SHOULD BE USED CAREFULLY, WE CROSS-VALIDATED THE RESULTING MAPS, BY REMOVING INDIVIDUAL WELL DATA ONE AT A TIME FROM THE DATA SET AND CHECKING THE RESULTS AND REPEATING THIS PROCEDURE FOR ALL OTHER WELLS. WE SUBSEQUENTLY CHOSE THE BEST FITTING MODEL AMONG THEM. THE RESULTS WERE REPRESENTATIVE OF THE STRENGTH OF GEOSTATISTICAL METHODS IN CHARACTERIZING RESERVOIRS.

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