# Associate reflectors at each online well with stratigraphic horizons using [[Checkshots_and_vertical_seismic_profiles#Vertical_seismic_profiles|vertical seismic profile (VSP)]], synthetic seismogram, or time-stretched logs. | # Associate reflectors at each online well with stratigraphic horizons using [[Checkshots_and_vertical_seismic_profiles#Vertical_seismic_profiles|vertical seismic profile (VSP)]], synthetic seismogram, or time-stretched logs. |