Conceptual Borehole Model

Conceptual Borehole Model

The core conceptual model for boreholes consists of the following featureTypes:

• BH_Collar: Information on the location of the borehole collar, together with relevant attributes.
• BH_Trajectory: The trajectory of the borehole. Encoding of the Geometry TBD, as unclear if we use a 3D Linestring or local polar coordinates.
• BH_SamplingFeatureEvent: An act applying a SamplingProcedure to create or transform one or more Sample(s). Information on how and where the Sample of the borehole under investigation (Point or Segment) has been sampled from this borehole.
• BH FoI (Sample) Types: An object that is representative of a concept, real-world object or phenomenon:
  • BH_Hole: A featureType representing the entire Hole of the borehole.
    • BH_HolePoint: A featureType representing a point along a borehole Hole, as indicated by the attribute atPosition.
    • BH_HoleSegment: A featureType representing a segment of a borehole Hole, as indicated by the attributes fromPosition and toPosition.
  • BH_Core: A featureType representing the entire Core of the borehole.
    • BH_CorePoint: A featureType representing a point along a borehole Core, as indicated by the attribute atPosition.
    • BH_CoreSegment: A featureType representing a segment of a borehole Core, as indicated by the attributes fromPosition and toPosition.

Note 1: Position values in the BH_FoIs are relative to the BH_Trajectory

Note 2: Point and Segment FoIs are sampled from the BH_Trajectory, not the entire Hole or Core. This modeling decision was reached due to technical constraints posed by STA. In order to maintain the link between Point and Segment FoIs and their entire Hole or Core feature, the sampledFeature association will be used.

In addition, the diagram below still shows the dataTypes providing the EventLocation, namely AtLocation and FromToLocation. However, the relevant attributes have already been shifted to the BH_Point and BH_Segment featureTypes respectively, valid due to 1:1 associations between these types.

Conceptual Borehole Model with Interfaces

In addition, we provide the same image including the relevant interfaces from the Linear Referencing and OMS Standards.

Conceptual Borehole Model with all Sampling Classes

In order to provide detailed information on how the Samples have been created, as well as any additional processing steps performed on these samples, the additional featureTypes from the OMS Sampling model have also been added. The following classes have been added to the diagram below:

• BH_Sampler: a device or entity (including humans) that is used by, or implements, a SamplingProcedure to create or transform one or more Sample(s).
• BH_SamplingProcedure: description of steps used to create or transform a Sample.
• BH_PreparationStep: an individual step pertaining to a PreparationProcedure.
• BH_PreparationProcedure: description of preparation steps performed on a Sample that is being observed.