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Description: The well shoot times and vertical seismic profiles should be corrected to the same datum as used for the seismic in the area. The datums should be recorded on the TZ graph/vertical seismic profile. The terminology and abbreviations to be used are as shown here:
Words in this image: KB, Kelly Bushing, d, depth of well geophone below KB, Ekb, Elevation of KB above datum, Z, Depth of geophone below datum, Dg, Depth of gun below Ground level, h, distance between ffun and gun hydrophone, dh, depth of well geophone below hydrophone, te, is that corretion which gives zero time at datum, x, Horizontal distance from well to gun = offset, B, Incident angle at well geophone levels, T, observed travel-time from hydrophone to geophone, t, time correction to vertical, tc, corrected travel-time to datum, deltaZ, interval distance, delta tc, interval travel-time, EGL, Elevation GL above datum, v, replacement velocity from hydrophone to datum, SRD, Seismic reference datum, MSL, Meam Sea Level, air gun