Home Work # 2 (02%)

Seismic Resolution

In the attached seismic section, the KFUPM-1 formation overlies the KFUPM-2 formation. The tops of both formations give rise to positive reflection coefficients. The central lobe of the zero-phase pulse on this data shows up as a white reflection coefficient. At the well location, the top of the KFUPM-1 appears just below 2.65 seconds and the top of the KFUPM-2 appears just below 2.80 seconds.

Note: KFUPM-1 & KFUPM-2 are not real names because of security.

1.     Estimate the time thickness of the KFUPM-1 formation at the well.  How big is the possible error in your answer?

2.     What is the thickness in feet of the KFUPM-1?  The interval velocity is 11,500 ft/sec.

3.     What is the minimum thickness in feet of an individual bed within the KFUPM-1 that can be accurately resolved?

4.     If there were patch reefs scattered throughout this region on the KFUPM-2 shelf margin, how far apart laterally would two of them have to be in order to be able to resolve them seismically?

5.     What would be the impact on the lateral resolution if you were to migrate this section?

Hint

The two-way travel-time and the associated average ve1ocity are:

0.7, 0.8, 0.9, 1.1, 1.3, 1.5, 1.7, 1.9, 2.1, 2.3, 2.5, 2.7, 2.85 sec

&

6.70, 6.75, 6.85, 7.2, 7.35, 7.6, 7.95, 8.35, 8.75, 9.10, 9.35, 9.60, 9.80 kft/sec.

Respectively.

GOOD LUCK