Abstract: The great advantage of well log constraint inversion technique is in that it can effectively supplement insufficiency of limited seismic bandwidth using rich high-frequency information of well log data and complete low-frequency component,and provide more reliable basis for fine reservoir description by inversion and obtained high resolution impedance data according to given geologic information and well log data as constrain conditions. This paper offers fine description and analysis of oil-bearing sands in Beisantai Arch by means of this method, thus enriching interpretation results of seismic data, effectively improving interpretation accuracy. In addition, this paper discusses the principle of seismic inversion, suitable conditions and applicable effectiveness.

Key words: well log constrain inversion, reservoir, sand body, impedance