COBEM99

S4 Ciências e Engenharia do Petróleo

Title:

APPLICATION OF SEISMIC ATTRIBUTE FILTERING WITH FACTORIAL KRIGING TO ESTIMATE POROUS VOLUME: A CASE STUDY ON A BRAZILIAN EAST COAST OFFSHORE TURBIDITE RESERVOIR

Summary :

THE ESTIMATION OF A RESERVOIR PROPERTIES IS A RISKY ISSUE. UNCERTAINTIES COME AROUND; THE NUMBER OF WELLS (HARD DATA) IS OFTEN LOW AND POORLY DISTRIBUTED. DENSELY SAMPLED, 3D SEISMIC INFORMATION (SOFT INFORMATION) HAS BEEN SEEN AS A KEY TO REDUCING INTERWELL UNCERTAINTIES. AS IT IS WELL KNOWN, HOWEVER, EVEN AFTER SEISMIC PROCESSING, NOISES AND SIGN DISTORTIONS REMAIN IF NOT INTRODUCED BY THE PROCESSING ITSELF. MOREOVER, INCONSISTENCY IN HORIZONS PICKING, DURING INTERPRETATION, WORSENS THE QUALITY OF THE OBTAINED ATTRIBUTES WITH CORRESPONDING IMPACT FOR ITS USE AS A PREDICTIVE VARIABLE FOR RESERVOIR MEAN PROPERTIES ESTIMATION. IN THIS PAPER, WE DISCUSS INCORPORATION OF SEISMIC ATTRIBUTES FILTERED BY FACTORIAL KRIGING VIA CONDITIONAL SIMULATION ON RESERVOIR POROUS VOLUME ESTIMATION. THE SEISMIC ATTRIBUTE MEAN ACOUSTIC IMPEDANCE OBTAINED FROM A 3D SEISMIC PROGRAM WITH SEISMIC STRATIGRAPHIC INVERSION IS CONSIDERED. IT SHOWS ITSELF TO BE WELL CORRELATED TO THE POROUS THICKNESS OF THE RESERVOIR INTERVAL UNDER CONSIDERATION. A NESTED CORREGIONALIZED MODEL WHICH PRESENTED TWO STRUCTURES WAS FITTED TO THE ATTRIBUTE. THE SMALL RANGE ASSOCIATED TO DATA NOISES WAS FILTERED BY FACTORIAL KRIGING, WHICH IMPROVED THE CORRELATION BETWEEN THE ACOUSTIC IMPEDANCE AND THE POROUS THICKNESS. THE DISPERSION OF THE CONDITIONAL SIMULATION CONSTRAINED BY THE FILTERED SEISMIC ATTRIBUTE IS LOWER THAN THE DISPERSION OF THE CONDITIONAL SIMULATION CONSTRAINED BY THE PRE-FILTERING ATTRIBUTE, REDUCING THE UNCERTAINTY OF THE RESERVOIR POROUS VOLUME ESTIMATION.

Author :

JOAHNN, PAULO R. S.
MUNDIM, EVALDO CESÁRIO
REMACRE, ARMANDO ZAUPA

Paper View :