Strat

Stratigraphy. More...

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::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::Layer
	data for a layer. More...
class	Strat::LayerGenerator
	Description that can generate layers and add these to a sequence. More...
class	Strat::LayerModel
	A model consisting of layer sequences. More...
class	Strat::LayerModelGenerator
	Generates LayerSequences. More...
class	Strat::LayerModelProvider
class	Strat::LayerSequence
	A sequence of layers. More...
class	Strat::LayerSequenceGenDesc
	Collection of LayerGenerator's that can generate a full LayerSequence. More...
class	Strat::LayerValue
class	Strat::LayModAttribCalc
class	Strat::LaySeqAttrib
	attrib to extract from layer sequences More...
class	Strat::LaySeqAttribCalc
	calculates attributes from layer sequences More...
class	Strat::LaySeqAttribSet
	attribs to extract from layer sequences More...
class	Strat::LeafUnitRef
	UnitRef for layers. More...
class	Strat::LeavedUnitRef
	UnitRef for units containing Leaf units only. More...
class	Strat::Lithology
	a name and an ID. More...
class	Strat::LithologySet
class	Strat::NodeOnlyUnitRef
	UnitRef for units containing non-Leaf units only. More...
class	Strat::NodeUnitRef
	UnitRef for units containing other units only. More...
class	Strat::RefTree
	Tree of UnitRef's More...
class	Strat::RepositoryAccess
	Repository of all stratigraphic descriptions defining the building blocks of subsurface descriptions. More...
class	Strat::SimpleLayerValue
class	Strat::SingleLayerGenerator
	Layer generator based on Leaf Unit. More...
class	Strat::UnitRef
	Reference data for a stratigraphic unit. More...
class	Strat::UnitRefIter
	Iterator on Ref Nodes. 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).