No abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA seismic survey was acquired over the Genesis Field in the deepwater Gulf of Mexico in October, 2002, 33 months after first production, for the purposes of reservoir monitoring and field management. The 1991 baseline survey was coprocessed with the 2002 monitor survey to minimize differences between the surveys except those related to production. Interpretation of the resulting seismic reflection and acoustic impedance (AI) volumes indicate that the 4D project will add significant value to the field.The 4D data have been interpreted for the field's five primary reservoir sands revealing production-related, timelapse anomalies including an increase in travel time of up to 10 ms at the top of the producing interval due to reservoir compaction and overburden dilation and changes in reflection strength due to fluid movement and pressure reduction. Updip potential was recognized and/or geological risk for remaining reserves reduced in three reservoirs and connectivity uncertainties in several reservoirs were resolved, leading to better understanding and modeling of reservoir behavior.Initial value of the 4D project has been indicated by the elimination of one anticipated sidetrack, saving over $10 million. Another sidetrack had its geological risk reduced and estimates of recoverable reserves increased. Several future sidetracks should be affected similarly. Updates to the geological model with corresponding adjustments to the reservoir simulation should lead to better well placement, better recovery estimates, and improved reservoir management.