Why Are Isopach Maps Important?

August 6, 2022

Isopach maps provide a more accurate picture of stratigraphic thickness as they reflect the thickness of the deposited bed. To calculate the isochrone or time interval map, subtract the upper horizon time from the base horizon time.

What is an isopach map used for?

An isopach map (/ˈaɪsoʊpæk/) illustrates thickness variations within a tabular unit, stratum, or stratum. Isopaches are contour lines of equal thickness across an area. Isopach maps are used in hydrographic surveying, stratigraphy, sedimentology, structural geology, petroleum geology, and volcanology.

What does isopach mean?

Definition of isopach

: an isoline connecting points of equal thickness in a geologic stratum or group of formations.

What is isopach in oil and gas?

1. n. [Geology] A contour connecting points of equal thickness. Typically, the isopach, or contours, that make up an isopach map show the stratigraphic thickness of a rock unit as opposed to the true vertical thickness. Isopaches are true stratigraphic thicknesses; i.e. perpendicular to bedding surfaces.

What is Isochore and isopach?

Isochore maps measure thickness from a point on the upper surface directly down to the corresponding point on the lower surface. Isopach maps show the stratigraphic thickness between an upper and a lower horizon. It is measured as the shortest distance between the two surfaces.

What is a population density map called?

Choropleth Cards is the fancy name for cards that display information in color. The following example uses different shades of a color to represent population density. This is the number of people living in an area.

How many types of geological maps are there?

There are three main types of geological maps: topographic maps, cross-sectional maps, and structural maps: Topographic maps are maps where places of equal elevation are connected by lines called contour lines.

What is Isolith map?

A map depicting isoliths; esp. a facies map showing the net thickness of a single rock type or selected rock component in a particular stratigraphic unit.

What is geophysical map?

Geophysical maps provide insight into the geology of an area by highlighting features and properties of the subsurface that are not apparent from a geological map alone. They are particularly useful in regions where there is limited bedrock outcrop to explore.

References:

1. https://en.wikipedia.org/wiki/Isopach_map
3. https://www.merriam-webster.com/dictionary/isopach
4. https://glossary.slb.com/en/terms/i/isopach