Sections are a representation of vertical slices into the earth, showing subsurface structure. One typically sees a series of (mostly) horizontal beds of varying thickness shown on the section. The boundaries between beds may be defined surfaces, and properties within a bed can be given by reference to the zoned data sub-model.
The spatial extent of a section is defined as follows: imagine a line drawn on the ground starting from some point. A second line can then be drawn starting from the end of the first line, and a third, and so on. The extent of the cross section then is the ordered collection of planes, or panels, produced by projecting these lines downward to a specific depth. See the 217-GEOLOGICAL-CROSS-SECTION for a diagram.
Label |
Restrictions |
Comments |
Optionality |
Units |
|
|---|---|---|---|---|---|
| SECTION-NAME | C=1, | R=ASCII | 1 | MAND | |
| SECTION-INTERSECTIONS | R=OBJREF | 2 | |||
| ZONES-IN-SECTION | R=ASCII | 3 | |||
| GEOLOGIC-FEATURE-NAME | R=ASCII | 4 | |||
| GEOLOGIC-FEATURE-SOURCE | R=ASCII | 4 | |||
| LOCATIONS | C>1,R=OBJREF, | R=OBJREF | 5 | MAND | |
SECTION-NAME C=1, R=ASCII MAND
The name of the section.
SECTION-INTERSECTIONS R=OBJREF
A list of references to objects of type 217-SECTION-INTERSECTION which identifies, and defines the intersection with, a single surface set.
ZONES-IN-SECTION R=ASCII
A list of names of zones which are found on the section. The first zone is the shallowest, or most recent. More information about the zones can be defined in 217-ZONE-DEFINITION objects. Once defined in this way, these named zones can be referenced by order number from the UP-ZONE and DOWN-ZONE attributes of the 217-SECTION-INTERSECTION object. This usage will probably be replaced by use of the GEOLOGIC-FEATURE-NAME and GEOLOGIC-FEATURE-SOURCE attributes. When present, the I-th value of each of these attributes must refer to the same feature/zone.
GEOLOGIC-FEATURE-NAME R=ASCII GEOLOGIC-FEATURE-SOURCE R=ASCII
The name and source of a set of geologic features. These should correspond to the ZONES-IN-SECTION attribute, and may eventually replace that attribute. Once defined in this way, these named geologic features can be referenced by order number from the UP-ZONE and DOWN-ZONE attributes of the 217-SECTION-INTERSECTION object. There may or may not be a 217-GEOLOGIC-FEATURE object in the same logical file or dataset whose GEOLOGIC-FEATURE-NAME and GEOLOGIC-FEATURE-SOURCE matches these values. Source refers to the interpreter, algorithm, vendor or regulatory body that provides information about this feature. Feature name and source are collectively the natural identifier for a geologic feature.
LOCATIONS C>1,R=OBJREF, R=OBJREF MAND
List of references to two or more 217-MAP-LOCATION objects giving the location on a map of the hinge points. This is an ordered list, so the first location is the surface location of the start point of the first line, or section origin, the second point is the point where the first and second lines meet, and so forth.
Send questions and comments to
Jim.Theriot@POSC.org
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