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Surpac input data how to#

Posted by Simon Kettle, GIS Consultant, Exprodat. The result is a structure map with values in true vertical depth since this process derived values directly from the Top Cretaceous and hence cannot account for dip within the stratigraphy. When comparing this calculated surface to the data used in a previous blog on Creating Block Diagrams I can see that it has created an accurate representation for the depth to the base Cretaceous. The output raster represents the depth to the Base Cretaceous from the Top Cretaceous

Raster calculator provides clear and easy to use options for conducting mathematical operations on raster datasets.

Calculating the depth to surface: To apply the math function to the newly created grids I opened used Raster Calculator Spatial Analyst > Map Algebra and ran the tool.

To help visualise the data I created contours lines to overlie the grids using the Spatial Analyst Contour tool.

This can be conducted by using the surface and interpolation tools in the Spatial Analyst toolbox. It is possible to calculate additional calibration derived from elevation values from specific locations such as outcrops, drill locations or picks for the input surfaces to produce a more accurate output surface. 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.

Surpac input data how to#

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). 310–331, 1933.Depth-to-surface maps can be derived from isopach (thickness) data, and are useful for visualising regional structural trends. Wadell, “Sphericity and Roundness of Rock Particles,” The Journal of Geology, vol. Weiss, “Geodetic Determining of Stockpile Volume of Mineral Excavated in Open Pit Mine,” GeoScience Engineering, vol. Shaharuddin, “Measuring Volume of Stockpile using Imaging Station,” Geoinformation Science Journal, vol. Pflipsen, “Volume computation : a comparison of total station versus laser scanner and different software,” MSc thesis (Geomagnetic), University of Gävle, Department of Technology and Built Environment, Sweden, 2007.ī. Filipov, “Volume Computation of a Stockpile - a Study Case Comparing GPS and Uav Measurements in AN Open Pit Quarry,” ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol. New York: Society of Mining Engineers, 1979. Hustralid, Open Pit Mine Planning and Design. The published work is the copyright of the Journal of Thai-Nichi Institute of Technology.

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