Unit 8 - Mapping

Question 1

Quality of a map relies on?

Answer 1

• The density and quality of the data

Question 2

What is discrete data?

Answer 2

• for example: well locations - they occur in one spot and are not connected between locations

Question 3

What is continuous data?

Answer 3

• Types of data that occur as a continuous surface or gradient between discrete points at which we know the value for these data → therefore these data can be represented by contours or a contoured surface on the map

Question 4

What is a base map?

Answer 4

-A 2D representation of the area being mapped

Question 5

What is most of the time taken as a datum for data?

Answer 5

• Sea level

Question 6

Difference Isopach and Isochore

Answer 6

Question 7

What is important to keep in mind of the value “zero” in a thickness map?

Answer 7

• because it only means, that the unit is not present, which means, that you are outside of the area where the unit has a positive thickness. → So in a thickness map, the zero contour occurs between the first positive values of thickness and the first zero values of thickness, and should not be drawn through all zero values
• In an elevation maps, ‘zero’ = sea level, and is a unique value that has an associated contour

Question 8

How do you call a line, that represents equal pressure?

Answer 8

• isobar

Question 9

How do you call a line, that represents equal temperature?

Answer 9

isotherm

Question 10

What is the only time that you can see a true dip of the layers on a cross section?

Answer 10

• only when the cross-section is drawn perpendicular to the strike or parallel to the dip direction
• and it is not allowed that the cross section is vertical exaggerated

Question 11

What does GRV stand for and what does it describe?

Answer 11

• Gross Rock Volume
• the total volume of rock between the mapped top surface that defines the top of the reservoir or potential reservoir and the hydrocarbon contact or expected hydrocarbon contact

Question 12

When will we have bottom water in an oil-reservoir and when will we have edge-water?

Answer 12

If the reservoir is thicker than the column height, then the there will be bottom-water; if the reservoir is thin relative to the column height, then there will be edge-water

Question 13

When do you know that there is no bottom water in the reservoir?

Answer 13

• when the base of the reservoir is above the hydrocarbon contact