CPG Petroleum Geology & Reservoir Characterization 3

Question 1

The Buckley-Leverett equation is used in reservoir engineering to describe:

Accepted Answer

Immiscible two-phase fluid displacement in porous media

Answer

The Buckley-Leverett equation describes the fractional flow and frontal advance of an immiscible displacing fluid (e.g., water) through a porous medium.

Question 2

Which structural trap type is formed by the intersection of two normal fault systems creating a down-dropped central block?

Accepted Answer

Graben

Answer

A graben is a down-dropped crustal block bounded by normal faults on both sides, formed where two normal fault systems intersect or parallel each other.

Question 3

In a type II kerogen, what is the primary hydrocarbon product generated during peak thermal maturation?

Accepted Answer

Oil-prone hydrocarbons

Answer

Type II kerogen is primarily marine-derived and oil-prone, generating liquid hydrocarbons at peak maturation within the oil window (Ro ~0.6–1.3%).

Question 4

Permeability anisotropy in clastic reservoirs is MOST commonly caused by:

Accepted Answer

Preferential alignment of clay minerals and bedding lamination

Answer

Bedding-parallel lamination and aligned clay minerals create higher horizontal permeability than vertical permeability, making permeability anisotropy common in clastic reservoirs.

Question 5

The depth to the gas-water contact in a reservoir is controlled by:

Accepted Answer

The spill point of the structural trap

Answer

The gas-water contact is ultimately constrained by the spill point of the structural or stratigraphic trap, below which hydrocarbons cannot be retained.

(CPG) Certified Petroleum Geologist Practice Test

(CPG) Certified Petroleum Geologist Practice Test

CPG Petroleum Geology & Reservoir Characterization 3