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===Isopach===
===Isopach===
A contour map of equal values of true stratigraphic thickness is an ''isopach map'' ([[:file:subsurface-maps_fig4.png|Figure 4]]). Except for vertical wells in horizontal beds, corrections for [[Wellbore trajectory|wellbore deviation]] and formation [[dip]] are needed to make isopach maps.
A [[contour]] map of equal values of true stratigraphic thickness is an ''isopach map'' ([[:file:subsurface-maps_fig4.png|Figure 4]]). Except for vertical wells in horizontal beds, corrections for [[Wellbore trajectory|wellbore deviation]] and formation [[dip]] are needed to make isopach maps.
===Isochore===
===Isochore===