Changes

{{publication  

{{publication  

  | image  = exploring-for-oil-and-gas-traps.png

  | image  = exploring-for-oil-and-gas-traps.png

  | part    = Traps, trap types, and the petroleum system

  | part    = Traps, trap types, and the petroleum system

  | chapter = Classification of exploration traps

  | chapter = Classification of exploration traps

  | frompg  = 2-1

  | frompg  = 2-11

  | topg    = 2-42

  | topg    = 2-12

  | author  = Richard R. Vincelette, Edward A. Beaumont, Norman H. Foster

  | author  = Richard R. Vincelette, Edward A. Beaumont, Norman H. Foster

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch02/ch02.htm

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch02/ch02.htm

==Basis for each level==

==Basis for each level==

A fairly flexible classification scheme has been devised in which each of the three trap systems is divided into three trap regimes, based primarily on the processes that control trap formation in the systems. The trap regimes can be divided into geometric classes and the classes into genetic families. Classifying traps using levels and the same basis at each level brings more consistency and value to classification. The table below shows the basis for each classification level and its definition.

A fairly flexible classification scheme has been devised in which each of the three [[trap]] systems is divided into three trap regimes, based primarily on the processes that control trap formation in the systems. The trap regimes can be divided into geometric classes and the classes into genetic families. Classifying traps using levels and the same basis at each level brings more consistency and value to classification. The table below shows the basis for each classification level and its definition.

{| class = "wikitable"

{| class = "wikitable"

|-

|-

! Classification level

! Classification level || Basis || Function/Definition

! Basis

! Function/Definition

|-

|-

| System

| System || Controlling geologic element || Dominant control of the trap—structural, stratigraphic, or fluidic.

| Controlling geologic element

| Dominant control of the trap—structural, stratigraphic, or fluidic.

|-

|-

| Regime

| Regime || Process || The dominant way of forming part or all of the trap [http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=closure closure]. If the trap is structural, was the closure formed by folding, faulting, or fracturing? If the trap is stratigraphic, was the closure formed by depositional, erosional, or diagenetic processes? If the trap is fluidic, was closure formed by pressure, temperature, or chemical processes?

| Process

| The dominant way of forming part or all of the trap closure. If the trap is structural, was the closure formed by folding, faulting, or fracturing? If the trap is stratigraphic, was the closure formed by depositional, erosional, or diagenetic processes? If the trap is fluidic, was closure formed by pressure, temperature, or chemical processes?

|-

|-

| Class

| Class || Geometry and/or composition

| Geometry and/or composition

|

|

*  Geometry—the external shape and size of the trap; may also include geometry of internal trap elements.  

*  Geometry—the external shape and size of the trap; may also include geometry of internal trap elements.  

*  Composition—the makeup of the reservoir, seal, or fluid that creates or defines the trap boundaries.

*  Composition—the makeup of the [[reservoir]], [[seal]], or fluid that creates or defines the trap boundaries.

|-

|-

| Family

| Family || Genesis || The way all or part of the trap closure came into being. For example, for an isolated marine carbonate trap, was the closure formed because of the reservoir and seal facies relationships of a reef, an oolite bar, or a tidal channel?

| Genesis

| The way all or part of the trap closure came into being. For example, for an isolated marine carbonate trap, was the closure formed because of the reservoir/seal facies relationships of a reef, an oolite bar, or a tidal channel?

|}

|}

* [[Structural trap system]]

* [[Structural trap system]]

** Fold Regime

** [[Fold trap regime|Fold Regime]]

** Fault Regime

** [[Fault trap regime|Fault Regime]]

** Fracture Regime

** [[Fracture trap regime|Fracture Regime]]

* [[Stratigraphic trap]] system

* [[Stratigraphic trap]] system

** Depositional regime

** [[Depositional trap regime|Depositional regime]]

** Erosional regime

** [[Erosional trap regime|Erosional regime]]

** Diagenetic regime

** [[Diagenetic trap regime|Diagenetic regime]]

* [[Fluidic trap system]]

* [[Fluidic trap system]]

** Pressure Regime

** [[Pressure trap regime|Pressure Regime]]

** Temperature Regime

** [[Temperature trap regime|Temperature Regime]]

** Fluid-Composition Regime

** [[Fluid-composition trap regime|Fluid-Composition Regime]]

==Trap classes and families==

==Trap classes and families==

As mentioned previously, the various trap regimes can be subdivided into trap classes and trap families, based on geometry, composition, and genesis. Ultimately, every oil accumulation can hopefully be classified correctly at the class and family levels.

As mentioned previously, the various trap regimes can be subdivided into trap classes and trap families, based on geometry, composition, and genesis. Ultimately, every oil [[accumulation]] can perhaps be classified correctly at the class and family levels.

==See also==

==See also==

[[Category:Traps, trap types, and the petroleum system]]  

[[Category:Traps, trap types, and the petroleum system]]  

[[Category:Classification of exploration traps]]

[[Category:Classification of exploration traps]]