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An isopach map () illustrates thickness variations within a tabular unit, layer or stratum. Isopachs are
www.structuralgeology.org
accessed 5 April 2013. *An isochore map displays lines of equal thickness in a layer where the thicknesses are measured vertically. Isochore maps in geology are also referred to as True Vertical Thickness (TVT) maps. Thus, an isochore and isopach map are the same only when both the top and bottom surfaces of the layer shown are horizontal. When the layer shown is inclined, as is usually the case, the thicknesses displayed in an isochore map of the layer will be greater than the thicknesses displayed in an isopach map of the same layer. The terms isopach and isochore are widely confused, and many times maps of True Vertical Thickness (TVT), which by definition are isochore maps, are incorrectly labeled isopach maps.
Oilfield Glossary
Map types Sedimentology Stratigraphy {{geology-stub he:מפה גאולוגית#מפה איזופכית
An isopach map () illustrates thickness variations within a tabular unit, layer or stratum. Isopachs are contour line
A contour line (also isoline, isopleth, or isarithm) of a function of two variables is a curve along which the function has a constant value, so that the curve joins points of equal value. It is a plane section of the three-dimensional grap ...
s of equal thickness over an area. Isopach maps are utilized in hydrographic survey
Hydrographic survey is the science of measurement and description of features which affect maritime navigation, marine construction, dredging, offshore oil exploration/ offshore oil drilling and related activities. Strong emphasis is placed ...
, stratigraphy, sedimentology, structural geology, petroleum geology and volcanology
Volcanology (also spelled vulcanology) is the study of volcanoes, lava, magma and related geological, geophysical and geochemical phenomena (volcanism). The term ''volcanology'' is derived from the Latin word '' vulcan''. Vulcan was the an ...
.
An isopach map is similar to an isochore map, but these terms actually describe different methods of displaying thickness variations within a layer.Levorsen (1967), p. 596-600 and 616.Tearpock and Bischke (2002), chap. 14.
*An isopach map displays lines of equal thickness in a layer where the thicknesses are measured perpendicular to the layer boundaries. Isopach maps are also referred to as True Stratigraphic Thickness (TST) maps.''Isopach maps vs isochore maps'' awww.structuralgeology.org
accessed 5 April 2013. *An isochore map displays lines of equal thickness in a layer where the thicknesses are measured vertically. Isochore maps in geology are also referred to as True Vertical Thickness (TVT) maps. Thus, an isochore and isopach map are the same only when both the top and bottom surfaces of the layer shown are horizontal. When the layer shown is inclined, as is usually the case, the thicknesses displayed in an isochore map of the layer will be greater than the thicknesses displayed in an isopach map of the same layer. The terms isopach and isochore are widely confused, and many times maps of True Vertical Thickness (TVT), which by definition are isochore maps, are incorrectly labeled isopach maps.
Notes
References
* Levorsen, A.I. (1967), ''Geology of Petroleum,'' W.H.Freeman and Company, San Francisco, 724 p. * Tearpock, Daniel J. and Bischke, Richard E. (2002), ''Applied Subsurface Geological Mapping with Structural Methods (2nd Edition),'' Prentice- Hall, Englewood Cliffs 822 p.External links
Oilfield Glossary
Map types Sedimentology Stratigraphy {{geology-stub he:מפה גאולוגית#מפה איזופכית