Seismic Signature of Transition Zone (Wolf Ramp) in Shale Deposits with Application of Frequency Analysis

Figure 9

Zoomed seismic profile that goes through the well: (a) migrated seismic section, (b) instantaneous frequency attribute. The curve is P wave velocity. In (b), red colours indicate lower frequencies, and purple indicates higher frequencies. Horizons’ marks are O3: the top of the Prabuty formation and Orv: top of the Kopalino formation. Black arrows indicate the characteristics of the low frequency anomaly (described in text), and blue arrow indicates tuning effect.

(a)

(b)