Data Gathering for Seismic Synthetic Tie-In in Very Large, Washed Out, and Cased Boreholes: An Application for Modern Borehole Acoustics and Neutron Capture Spectroscopy

Formation density and acoustic velocities are required over the<br>entire overburden interval for proper seismic calibration.<br>However, these data are often not acquired owing to poor<br>borehole conditions encountered in the shallow sections of the<br>borehole. This paper describes log acquisition, processing, and<br>interpretation required to provide the necessary simulated log<br>information using neutron capture spectroscopy and the latestgeneration<br>borehole acoustic logs acquired through casing.<br>The method presented is the result of a combined effort of a<br>team of geophysicists and petrophysicists.