GP 202 Reservoir Geomechanics

Spring 2014, OpenEdX

Homework 2 – Estimating the Onset of Overpressure

SOLUTIONS Click the link at the top of the page to download the solutions data

Part 1: Estimating the onset of overpressure

a. Plot porosity vs. depth.

b. Estimate porosity assuming an exponential compaction trend.

c. Use the parameters given to calculate the theoretical compaction trend.

d. Estimate the onset of overpressure.

Part 2: Estimating the magnitude of overpressure

a. Compute pore pressure using the calculated porosity data.

b. Estimate the magnitude of overpressure.

Part 3: Answers to Homework 2 Questions

Question 2: Estimating the onset of overpressure

Use your plot comparing the theoretical and calculated porosities to estimate the depth of

the onset of overpressure in the GOM data set.

= 5000 +/- 1000 ft

Question 3: Estimating the magnitude of overpressure

Use your plot comparing the theoretical and calculated pore pressures to estimate the

magnitude of overpressure at 10000 ft in the GOM data set.

= 11.6731 +/- 5 MPa