CMM Exploration & Production Processes 5

Question 1

What does 'proved developed producing' (PDP) reserves classification mean under SEC definitions?

Accepted Answer

Reserves recoverable from existing wells currently on production with current equipment

Answer

PDP reserves are the highest-confidence category, representing volumes expected from currently producing wells using existing infrastructure.

Question 2

In 3D seismic acquisition, what is the purpose of 'time migration' processing?

Accepted Answer

To reposition seismic reflectors to their true subsurface locations in time domain

Answer

Time migration collapses diffractions and moves dipping reflectors to their correct time-domain positions, improving structural imaging accuracy.

Question 3

Which drive mechanism in a reservoir relies on dissolved gas coming out of solution to provide the energy to push oil to the wellbore?

Accepted Answer

Solution gas drive (dissolved gas drive)

Answer

Solution gas drive liberates dissolved gas as reservoir pressure drops below bubble point, and expanding gas bubbles drive oil toward producing wells.

Question 4

What is the significance of the 'dew point' pressure in a gas condensate reservoir?

Accepted Answer

Pressure below which liquid hydrocarbons condense from the gas phase in the reservoir

Answer

Below dew point pressure, retrograde condensation occurs — liquid hydrocarbons drop out in the reservoir pore space, often becoming unrecoverable.

Question 5

Which technique uses variations in Earth's gravitational field to map subsurface density contrasts, helpful in identifying salt bodies or basement features?

Accepted Answer

Gravity survey

Answer

Gravity surveys measure gravitational acceleration differences caused by density variations — salt (low density) and basement rocks create characteristic anomalies.

(CMM) Certified Mineral Manager Practice Test

(CMM) Certified Mineral Manager Practice Test

CMM Exploration & Production Processes 5