Stretch Free Stacking and its effects on aClastic Exploration play

摘要

A 3-D seismic survey was shot over a set of spatially complex channel leads that werernthought to be charged with both gas and water. The prospects being investigated sufferedrnfrom spatial and temporal reservoir resolution problems as well as fluid risks. In the attemptrnto address these challenges, the seismic data was processed using a new algorithm thatrnpromised to handle the long offset information advantageously. This algorithm is a newrnprocess that is meant to eliminate NMO stretch effects in the stack. Since fluid estimationrnwas of such concern in this dataset, the algorithm was also used to create NMO stretch freerngathers for AVO analysis. The results of this work seemed to be excellent. Numerous newrnprospects were identified on the 3-D survey, one of which could not have been identifiedrnwithout the stretch free stack process, or SFS (for brevity), and AVO analysis. As isrnsometimes the case, the most difficult and interesting task became that of understanding whatrnthe SFS process actually did to the data and why.