Core Description
Assignment
You are the supervisor for the core analysis program to be conducted on some full diameter core recently acquired by your company. Provide a list of the topics which you would like to see addressed in the core description report.
Solution
Ideally, the core description report should include descriptions of all of the following:
- Rock type
- Lithological description
- Color
- Thickness of units
- Grain size
- Sorting
- Texture
- Major characteristics
- Minor characteristics
- Degree of formation consolidation
- Sedimentary structures
- Fossils and microfossils
- Oil staining and fluorescence
- Porosity
Assessment
1. Which of the following can generally be acquired with a core description? (Select all that apply.)
A .Fossils Correct ✔
B .Color Correct ✔
C .Degree of formation consolidation Correct ✔
D .Grain size distribution
E .Permeability
2. What types of porosity can occur in clastic rocks? (Select all that apply.)
A .Intragranular Correct ✔
B .Microporosity Correct ✔
C .Fracture Correct ✔
D .Intergranular Correct ✔
E .Fenestral
3. What types of preserved remains are often good indicators of the depositional environment? (Select all that apply.)
A .Animals Correct ✔
B .Plants Correct ✔
C .Humans
D .Other organisms Correct ✔
4. Variations in what properties often cause changes in a rock’s lithology? (Select all that apply.)
A .Variations in the physical properties Correct ✔
B .Variations in the sediment’s depositional environment Correct ✔
C .Variations in the chemical properties Correct ✔
D .Variations in the rock’s age
5. When the rock’s color is not uniform, how can it be described? (Select all that apply.)
A .Mottled Correct ✔
B .Faded
C .Spotted Correct ✔
D .Banded Correct ✔
6. What color fluorescence do oil productive zones usually exhibit?
A .White
B .Silver
C .Gold Correct ✔
D .Black
Recommended for You
The Principles of Geosteering | Geosteering Best Practices
