Author Archives: Andrew Thorne

Reservoir Volume Determinations from Isopachs: Using the Trapezoid and Pyramid method

Use this excel spreadsheet to calculate the reservoir volumes via the horizontal slice method from an isopach map that has been planimetered. The two methods used are the trapezoid and pyramidal equations. See notes on spreadsheet.reservoir volumetrics using the trapezoid and pyramid methods

Converting a survey plat in degrees to XY coordinates for use in mapping software (Kingdom, ArcGIS, etc.)

Use this spreadsheet to convert lat/long degrees to XY coordinates.  The primary use of this spreadsheet was to allow the user to convert old paper copies of drilling & production units (Louisiana DNR Office of Conservation Units) into a usable format for display in their mapping software.  In my case, we converted the lat/long “call points” which were posted on the plat as a bearing and distance, and convert them over to the Louisiana State Plane XY Lambert coordinate system.  Once in XY format, the values can be copied into most software to display the polygon shapes.  The mapping software we use are IHS/SMT Kingdom and ArcGIS.

XY Conversion Spreadsheet (for plotting survey plats) 071813