Difference between revisions of "Classifying traps"

Latest revision as of 15:15, 19 December 2014

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Trap classification

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-{{publication
+#REDIRECT [[Trap classification]]
- | image   = exploring-for-oil-and-gas-traps.png
- | width   = 120px
- | series  = Treatise in Petroleum Geology
- | title   = Exploring for Oil and Gas Traps
- | part    = Traps, trap types, and the petroleum system
- | chapter = Classification of exploration traps
- | frompg  = 2-1
- | topg    = 2-42
- | author  = Richard R. Vincelette, Edward A. Beaumont, Norman H. Foster
- | link    = http://archives.datapages.com/data/specpubs/beaumont/ch02/ch02.htm
- | pdf     =
- | store   = http://store.aapg.org/detail.aspx?id=545
- | isbn    = 0-89181-602-X
-}}
-==Classification flexibility==
-The common occurrence of combination traps, which involve many different types and varieties of trapping elements, requires a scheme that allows for such variations. Consequently, a classification scheme such as that used to organize a stamp or coin collection might be more useful, especially one in which a variety of flexible methods of organization can be used.
-For example, stamps can be organized or classified in many different ways: stamps from one country, stamps from all countries for a certain period, stamps from different countries with similar themes or colors, etc. Depending upon the needs of the stamp collector, the ability to search through a stamp classification scheme and pick out whatever combination of stamps is desirable would be a powerful research tool. In a similar manner, a flexible trap classification scheme should allow for different methods of classifying and cataloging hydrocarbon traps, depending upon the needs of the investigator. The intent is that the proposed classification scheme allows for such flexibility.
-==Classification levels==
-The proposed classification scheme places traps into four ranked levels, from general to specific:
-. System
-:2. Regime
-::3. Class (Superclass if necessary)
-:::a. Subclass
-:::b. Style (if necessary)
-::::4. Family (Superfamily if necessary)
-:::::a. Subfamily
-:::::b. Variety (if necessary)
-==Basis for each level==
-Most of the levels and sublevels (outlined above) are necessary to adequately describe, in the classification scheme, all of the different elements that characterize a trap. Each level has its own unique basis for classification. Trap systems are based on the controlling geologic elements that created the traps, trap regimes are based on the geologic processes that caused the traps in each system, traps classes are based on the geometry and composition of the traps within the trap regimes, and trap families are based on the genesis or origin of the traps within the trap classes.
-==Workflow==
-Classifying traps is interpretive. As more data become available, the trap classification can change or be modified. Different explorationists may classify a particular trap in completely different categories, depending on their particular viewpoints.
-Traps can be classified formally or informally. An informal classification is descriptive; little knowledge is needed to classify a trap beyond learning how to describe it. A formal classification is more rigorous and requires knowing the structure of the scheme proposed in this chapter.
-==Informal classification==
-[[file:classification-of-exploration-traps_fig2-1.png|300px|thumb|{{figure number|1}}Map and cross section of the East Anschutz Ranch field.]]
-An informal classification is a description that conveys a general or specific impression of a trap. For example, East Anschutz Ranch field, shown in the map and [[cross section]] in [[:file:classification-of-exploration-traps_fig2-1.png|Figure 1]], could be informally classified as an anticlinal trap. This informal classification conveys a very general impression of the trap. Informal classification can also be more specific. For example, we might classify East Anschutz as an elongated asymmetric anticline with a gently dipping back limb and a steeply to overturned forelimb.
-==Formal classification==
-[[file:classification-of-exploration-traps_fig2-2.png|thumb|300px|{{figure number|2}}Formal classification for East Anschutz Ranch.]]
-A formal classification conveys more information than an informal classification. It is also more rigorous. The diagram in [[:file:classification-of-exploration-traps_fig2-2.png|Figure 2]] shows the formal classification for East Anschutz Ranch.
-==Procedure==
-The table below lists the procedure for classifying a trap.
-{| class = "wikitable"
-|-
-! Step
-! Action
-|-
-| 1
-| Determine the trap system: structural, stratigraphic, or fluidic.
-'''If''' More than one element controls the trap Go to step 2
-'''Then''' Only one element controls the trap Go to step 3
-|-
-| 2
-| Determine the primary, secondary, and (if necessary) tertiary trap system.
-|-
-| 3
-| Determine the trap regime. What process formed trap closure?
-|-
-| 4
-| Determine the trap class. Which class best describes trap geometry, or which class describes compositional makeup of the reservoir or seal or fluid that creates or defines trap boundaries?
-|-
-| 5
-| Determine the trap family. What is the genesis of trap closure?
-|-
-| 6
-| If necessary, use intermediate groupings (superclasses, superfamilies, sub- classes, styles, subfamilies, styles, varieties) to give fuller descriptions.
-|}
-==See also==
-* [[Classification philosophy]]
-* [[How to use the trap classification scheme]]
-* [[Combination trap]]
-* [[Classification basis]]
-* [[Trap classification levels]]
-==External links==
-{{search}}
-* [http://archives.datapages.com/data/specpubs/beaumont/ch02/ch02.htm Original content in Datapages]
-* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]
-[[Category:Traps, trap types, and the petroleum system]]
-[[Category:Classification of exploration traps]]

Difference between revisions of "Classifying traps"

Latest revision as of 15:15, 19 December 2014

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