What map type displays thickness distribution of a formation across space?

What map type displays thickness distribution of a formation across space?

• A. Isopach Map
• B. Contour Map
• C. Topographic Map
• D. Seismic Map

Answer: (A)

Thickness distribution of a formation across space is depicted with an isopach map. Isopachs connect points that have the same thickness, so you can easily see where the layer thickens or thins out and how thickness changes across the area. This is especially useful in petroleum exploration for assessing reservoir potential and understanding depositional patterns. A contour map, by contrast, maps lines of equal value on a surface (often elevation or another variable) and isn’t specifically about thickness of a subsurface unit. A topographic map shows surface relief, while a seismic map displays properties from seismic data (like velocity or impedance) rather than direct thickness. So the isopach map is the best choice for showing thickness distribution.

Thickness distribution of a formation across space is depicted with an isopach map. Isopachs connect points that have the same thickness, so you can easily see where the layer thickens or thins out and how thickness changes across the area. This is especially useful in petroleum exploration for assessing reservoir potential and understanding depositional patterns. A contour map, by contrast, maps lines of equal value on a surface (often elevation or another variable) and isn’t specifically about thickness of a subsurface unit. A topographic map shows surface relief, while a seismic map displays properties from seismic data (like velocity or impedance) rather than direct thickness. So the isopach map is the best choice for showing thickness distribution.