Tying seismic data to geologic information from core data: an example from ODP Leg 177

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Wildeboer Schut, E. and Uenzelmann-Neben, G. (2006): Tying seismic data to geologic information from core data: an example from ODP Leg 177 , Geo-Marine Letters, 26 . doi: 10.1007/s00367-006-0033-3
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The integration of seismic data with core data provides ground-truth toa structural interpretation of seismic data.The most important difficulty that arises in an integration effort isthe correct translation between the different scales of the core dataand the seismic data.In the absence of check-shots, detailed knowledge of the velocitystructure at the drilling locations is required, either from downholelogging measurements, velocity analysis of the seismic data, or directmeasurements on core samples.Three of the seven drill-sites during ODP (Ocean Drilling Program) Leg177 in the south-eastern Atlantic were located on the Agulhas Ridge andconnected through eight seismic profiles.Synthetic seismograms created from velocity and density measurements onselected core samples generally show a good agreement with real seismicdata with respect to amplitude and waveform, whereas timing of theevents is troublesome.The use of velocity profiles with inaccurate sections along cores, afalse depth scale due to recovery problems, and inaccuracies in thepositioning during both seismic and coring operations are the mainshortcomings of this method.The main reflectors identified on seismic data correspond to hiatuses orperiods of reduced sedimentation rates, and correlate well with densityvariations.In this way the cored data provide a calibration tool for the overallgeological interpretation of the seismic sections.

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