Improving 4D Seismic Repeatability Using 3D Factorial Kriging

C028 IMPROVING 4D SEISMIC REPEATABILITY USING 3D FACTORIAL KRIGING Summary Geostatistical filtering (factorial kriging) was applied to the 1981-1996 time lapse seismic data of the TOTAL UK Alwyn field . The goal was to suppress the noises and acquisition artifacts in both datasets in order to improve the 4D repeatability. After filtering the measured coherency (both vertically and spatially) between the two equalized cubes was largely improved. Consequently the 4D events seen in the interval of production appeared to be better focused which permitted to perform a timelapse interpretation with a much higher level of confidence. Introduction 1 The 1981