Abstract：He-4 well block situates in central ridge zone of Dongying sag,because of complex rift system in that well block,poor seismic data quality and rapid lateral variation of reservoir,the distribution of the sand body of middle and lower reservoir of S3 Formation is unclear,which restricted the exploration and development of the new bed set.The logging-restrained seismic inversion technique is applied in the area,taking fine interpretation of layers and faults,building up wave-impedance model conformed with geologic rule of complex rift zone,the wave-impedance data volume with high-resolution is finally obtained by inversion.Using wave-impedance inversion data volume to implement reservoir prediction,distributed rule of sand body and sedimentary rule of reservoir in complex rift zone are revealed.Total 30 sand bodies have been described by using the method,15 favorable drilling targets have been presented,provided a solid basis for developing middle and lower reservoir of S3 Formation in down-dropped block of He-13 fault in that well block.
