Table 2 indicates that the hot oil zone is characterized by a pore pressure increase of about 75 psia, a temperature increase of about 75 F, and a reduction of gas saturation to about 0%, compared to ambient reservoir conditions. The pore pressure increase results in Vp decrease of 5% at most. The temperature increase in mixed oil/water saturated cores results in a Vp decrease of about 10-15%, as shown in Figure Vptemp. The reduction of the gas saturation from an initial 10% to a final 0% may result in a Vp increase as large as 20-25%. Combining these effects, the net change in velocity at the hot oil zone may be negligible, compared to initial reservoir conditions. Since the density change is also negligible, the hot oil zone may be seismically transparent.