Abstract:

For Puguang gas field,a giant structural-lithologic gas field with dolomite reservoirs of reef flat facies in Changxing-Feixianguan formations as the main zones of interest,the comprehensive reservoir prediction technology is considered one of the key solutions for gas exploration.Through AVO attribute processing of pre-stack time migration data,the problem of migration of AVO abnormality is well solved,the AVO responses are enhanced,and the quality of AVO data analysis is improved.Based on an integrated analysis of logging and geologic data,recognition patterns are established for the AVO abnormality of the Feixianguan Formation gas reservoirs of oolitic beach facies in Puguang gas field through forward modeling,and AVO attribute analysis is also performed.AVO techniques can be effectively applied to oil & gas exploration in northeastern Sichuan.

Key words: AVO, cross plot, prestack time migration,oolitic beach reservoirs, Puguang gas field, Sichuan basin