Note that if I wanted to find the depth to a surface using multiple isopachs then some additional processing would have been required to combine the isopach thickness values together. I used these to calculate the depth to the Base Cretaceous surface. In the following example I used two grids – one representing the depth of the Top Cretaceous (the first image) and the other the Cretaceous Isopach. In this example we are dealing with an offshore subsurface stratigraphy therefore depths are recorded as positive integers where depths are below sea level.
MethodĬalculating the depth to a surface uses the following principle and requires a surface with a corresponding isopach.
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This blog demonstrates how to use mathematic functions in ArcGIS to create a grid representing the depth to a stratigraphic surface in the Viking Graben area of the UKCS ( see previous blog for data and area). Depth-to-surface maps can be derived from isopach (thickness) data, and are useful for visualising regional structural trends.
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