珠一凹陷古近系复杂断裂区成像技术研究与应用OACSTPCD

The complex fault area of Paleogene in Zhuyi Sag,the Pearl River River Mouth Basin,northern South China Sea,is a favorable zone for oil and gas migration and accumulation,with great exploration potential.Howev-er,the Paleogene strata have a large burial depth,rapid lateral velocity changes,and there is a problem of un-clear seismic imaging.In addition,the seismic wave reflection path in complex fault areas is complex,making im-aging more difficult,which seriously restricts the oil and gas exploration process in this area.Firstly,high-preci-sion broadband processing technology is used to improve the reflection quality of low-frequency signal in earth-quakes;Then,geological constrained velocity modeling is introduced,and high-precision velocity inversion based on stable low-frequency signal model is used to improve the imaging effect of pre-stack depth migration and enhance the imaging quality of complex fault areas in the Paleogene.