CPG Exploration Techniques & Seismic Interpretation

Question 1

What is the primary objective of seismic interpretation in exploration?

Accepted Answer

To locate potential drilling sites based on subsurface data

Answer

The primary objective of seismic interpretation in exploration is to locate potential drilling sites by analyzing subsurface data. Geologists interpret seismic images to identify and map geological structures, such as faults, folds, and stratigraphic traps, that could contain hydrocarbon accumulations. This detailed understanding of the subsurface helps minimize drilling risks and optimize exploration success.

Question 2

Which type of seismic wave is most commonly used in reflection seismic surveys?

Accepted Answer

P-waves

Answer

P-waves (compressional or primary waves) are predominantly used in reflection seismic surveys because they are the fastest seismic waves and can travel through solids, liquids, and gases. These waves reflect off geological interfaces, providing clear signals that are essential for imaging the Earth's subsurface. Their ability to propagate through various media makes them highly effective for generating detailed subsurface profiles.

Question 3

What is the function of a geophone in seismic surveys?

Accepted Answer

To convert seismic waves into electrical signals

Answer

A geophone's function in seismic surveys is to convert ground motion caused by seismic waves into electrical signals. These sensors detect the vibrations reflected from subsurface layers, transforming them into data that can be recorded and processed. This conversion is fundamental for creating a visual representation of the Earth's interior.

Question 4

Which technique helps improve image clarity in seismic interpretation?

Accepted Answer

Migration

Answer

Migration is a crucial seismic data processing technique that significantly improves image clarity in seismic interpretation. It repositions seismic reflections to their true subsurface locations, correcting for distortions caused by dipping layers and complex geological structures. This process results in a more accurate, focused, and geologically realistic image of the subsurface.

Question 5

What is a seismic section?

Accepted Answer

A visual profile of subsurface layers using seismic data

Answer

A seismic section is a visual profile of subsurface layers derived from processed seismic data. It represents a cross-sectional view of the Earth's interior, displaying reflections from different geological formations. This profile allows geologists to interpret the stratigraphy, identify structural features, and visualize potential hydrocarbon traps.

(CPG) Certified Petroleum Geologist Practice Test

(CPG) Certified Petroleum Geologist Practice Test

CPG Exploration Techniques & Seismic Interpretation