Strat

Classes
class	Strat::Content
	stuff that can be inside porous layers More...
class	Strat::ContentSet
	set of names for stuff that can be inside porous layers More...
class	Strat::Layer
	data for a layer. More...
class	Strat::LayerValue
class	Strat::SimpleLayerValue
class	Strat::FormulaLayerValue
	returns a layer value based on Math::Formula. It does not copy the Formula, so keep the formula alive while the layer is alive! More...
class	Strat::LayerModel
	A model consisting of layer sequences. More...
class	Strat::LayerModelProvider
class	Strat::LayerSequence
	A sequence of layers. More...
class	Strat::LayerGenerator
	Description that can generate layers and add these to a sequence. More...
class	Strat::LayerModelGenerator
	Generates LayerSequences. More...
class	Strat::LaySeqAttrib
	attrib to extract from layer sequences More...
class	Strat::LaySeqAttribSet
	attribs to extract from layer sequences More...
class	Strat::LaySeqAttribCalc
	calculates attributes from layer sequences More...
class	Strat::LayModAttribCalc
class	Strat::LayerSequenceGenDesc
	Collection of LayerGenerator's that can generate a full LayerSequence. More...
class	Strat::Lithology
	a name and an ID. More...
class	Strat::LithologySet
class	Strat::RefTree
	Tree of UnitRef's. More...
class	Strat::SingleLayerGenerator
	Layer generator based on Leaf Unit. More...
class	Strat::UnitRef
	Reference data for a stratigraphic unit. More...
class	Strat::NodeUnitRef
	UnitRef for units containing other units only. More...
class	Strat::NodeOnlyUnitRef
	UnitRef for units containing non-Leaf units only. More...
class	Strat::LeavedUnitRef
	UnitRef for units containing Leaf units only. More...
class	Strat::LeafUnitRef
	UnitRef for layers. More...
class	Strat::UnitRefIter
	Iterator on Ref Nodes. More...
class	Strat::RepositoryAccess
	Repository of all stratigraphic descriptions defining the building blocks of subsurface descriptions. More...

Detailed Description

Stratigraphy

This module supports hierarchical naming of units, with supporting tools like lithology selection.

Although a stratigraphic framework can be used independently of any geometry, an easy way to think about it is how it could be used for wells. Every layer in a well can be interpreted as being a specific instantiation of an abstract unit defined in the framework. For example, a sand layer in the upper cretaceous could be labeled cret.upp.sand . Two layers further a similar sand layer can have the same label. Both are then instantiations of this cret.upp.sand 'template unit'.

A classification system invariably has a tree structure. The nodes in the tree are stratigraphic units, the leaves are lithologies. Every unit can have a number of properties (porosity, sand/shale ratio, etc.).

A well interpretation defines a linear sequence of instantiated units, i.e. instantiations of the stratigraphic framework are often simply lists of units. Keep in mind that this is not necessary: any network of connections (not just the array-like ordering) between instantiations may be interesting in certain problems.

To implement these thoughts the separation 'reference data' and 'actual subsurface unit' has been made. A layer is a unit that holds a pointer to a conceptual unit (e.g. there are a couple of sand layers connected to the cret.upp.sand reference data).