Difference between revisions of "Kerogen type and quality: visual assessment"

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{{Merge|Kerogen}}
 
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  | author  = Carol A. Law
 
  | author  = Carol A. Law
 
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==The method==
 
==The method==
  
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[[File:VanKrevelanDiagram.png|thumb|300px|Van Krevelen diagram.]]
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To assess [[kerogen]] quality visually, we can separate it from the mineral matrix through acidification. We can then examine the kerogen using transmitted light through a microscope to determine its form (structured or amorphous) and origin. Structured kerogens include woody, herbaceous, [[Thermal maturation#Vitrinite|vitrinite]], and [[inertinite]]. Amorphous kerogens are by far the most prevalent and include most of the algal material.
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To assess kerogen quality visually, we can separate it from the mineral matrix through acidification. We can then examine the kerogen using transmitted light through a microscope to determine its form (structured or amorphous) and origin. Structured kerogens include woody, herbaceous, vitrinite, and inertinite. Amorphous kerogens are by far the most prevalent and include most of the algal material.
 
  
 
Visual kerogen estimates are usually presented in terms of the percentage of each type of kerogen in a sample derived from cuttings composites or core (conventional or sidewall). For example, a visual estimate of kerogen type might be stated as 50% woody, 45% amorphous, 5% inertinite. In general, the more amorphous kerogen present, the more oil prone the rock is.
 
Visual kerogen estimates are usually presented in terms of the percentage of each type of kerogen in a sample derived from cuttings composites or core (conventional or sidewall). For example, a visual estimate of kerogen type might be stated as 50% woody, 45% amorphous, 5% inertinite. In general, the more amorphous kerogen present, the more oil prone the rock is.
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| Oil and gas prone
 
| Oil and gas prone
 
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| [[Thermal maturation#Vitrinite|vitrinite]]
 
| Gas prone
 
| Gas prone
 
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| Inertinite
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| [[Inertinite]]
 
| No potential
 
| No potential
 
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[[Category:Critical elements of the petroleum system]]  
 
[[Category:Critical elements of the petroleum system]]  
 
[[Category:Evaluating source rocks]]
 
[[Category:Evaluating source rocks]]
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[[Category:Treatise Handbook 3]]

Latest revision as of 18:17, 9 February 2022

 It has been suggested that this article be merged with [[::Kerogen|Kerogen]]. (Discuss)
Exploring for Oil and Gas Traps
Series Treatise in Petroleum Geology
Part Critical elements of the petroleum system
Chapter Evaluating source rocks
Author Carol A. Law
Link Web page
Store AAPG Store

The method

To assess kerogen quality visually, we can separate it from the mineral matrix through acidification. We can then examine the kerogen using transmitted light through a microscope to determine its form (structured or amorphous) and origin. Structured kerogens include woody, herbaceous, vitrinite, and inertinite. Amorphous kerogens are by far the most prevalent and include most of the algal material.

Visual kerogen estimates are usually presented in terms of the percentage of each type of kerogen in a sample derived from cuttings composites or core (conventional or sidewall). For example, a visual estimate of kerogen type might be stated as 50% woody, 45% amorphous, 5% inertinite. In general, the more amorphous kerogen present, the more oil prone the rock is.

Visual kerogen types and quality

Visual kerogen types and quality are shown in the table below.

Visual kerogen type Hydrocarbon potential
Woody Gas prone
Herbaceous Oil and gas prone
vitrinite Gas prone
Inertinite No potential
Amorphous (dominantly algal) Oil and gas prone

See also

External links

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