Difference between revisions of "Pressure prediction: reconstructing burial history"

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{{Merge|Pressure prediction}}
 
{{publication  
 
{{publication  
 
  | image  = exploring-for-oil-and-gas-traps.png
 
  | image  = exploring-for-oil-and-gas-traps.png
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  | part    = Critical elements of the petroleum system
 
  | part    = Critical elements of the petroleum system
 
  | chapter = Formation fluid pressure and its application
 
  | chapter = Formation fluid pressure and its application
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  | frompg  = 5-1
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  | frompg  = 5-37
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  | topg    = 5-64
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  | topg    = 5-37
 
  | author  = Edward A. Beaumont, Forrest Fiedler
 
  | author  = Edward A. Beaumont, Forrest Fiedler
 
  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm
 
  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch05/ch05.htm
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  | isbn    = 0-89181-602-X
 
  | isbn    = 0-89181-602-X
 
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Reconstructing the burial history of a play area gives an estimate of vertical displacement by either burial or faulting of at least an order of magnitude of measurement. A pressure-depth plot, using the estimate of vertical displacement and normal fluid gradients, helps reveal the magnitude of the pressure abnormality that might be present if seals were in place at the appropriate time to trap the abnormal pressure.
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Reconstructing the [[burial history]] of a play area gives an estimate of vertical displacement by either burial or faulting of at least an order of magnitude of measurement. A pressure-depth plot, using the estimate of vertical displacement and [[Normal hydrostatic pressure gradients|normal fluid gradients]], helps reveal the magnitude of the [[Abnormal hydrostatic pressure|pressure abnormality]] that might be present if seals were in place at the appropriate time to trap the abnormal pressure.
  
 
==Procedure: predicting fluid pressure==
 
==Procedure: predicting fluid pressure==
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To predict the fluid pressure of a sealed container using burial history analysis, use the procedure outlined in the table below.
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To predict the fluid pressure of a sealed container using burial history analysis, use the procedure outlined below.
  
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{| class = "wikitable"
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# Plot the [[Normal hydrostatic pressure gradients|normal pressure gradient]] that existed when the container was sealed.
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|-
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# Plot the present gradient, adding the new depth of burial.
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! Step
 
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! Action
 
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|-
 
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| 1
 
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| Plot the normal pressure gradient that existed when the container was sealed.
 
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|-
 
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| 2
 
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| Plot the present gradient, adding the new depth of burial.
 
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|}
 
  
 
==Example==
 
==Example==
  
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[[file:formation-fluid-pressure-and-its-application_fig5-19.png|thumb|{{figure number|1}}See text for explanation.]]
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[[file:formation-fluid-pressure-and-its-application_fig5-19.png|300px|thumb|{{figure number|1}}Burial stages 1, 2, and 3 and the corresponding pressure-depth relationships.]]
  
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In the case of a sand body carried deeper by a growth fault, first plot the normal gradients that would have existed prior to burial; then replot the gradients at the existing depth.
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In the case of a sand body carried deeper by a [[growth fault]], first plot the [[Normal hydrostatic pressure gradients|normal gradients]] that would have existed prior to burial; then replot the gradients at the existing depth.
  
 
The diagrams in [[:file:formation-fluid-pressure-and-its-application_fig5-19.png|Figure 1]] illustrate burial stages 1, 2, and 3 and the corresponding pressure-depth relationships.
 
The diagrams in [[:file:formation-fluid-pressure-and-its-application_fig5-19.png|Figure 1]] illustrate burial stages 1, 2, and 3 and the corresponding pressure-depth relationships.
  
 
==Using normal pressure gradient==
 
==Using normal pressure gradient==
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Use of normal pressure gradients only gives an approximation for estimating pressure in a burial history analysis. It is difficult, if not impossible, to be more precise because there are so many other unknowns, such as pressure and temperature at the charging stage, molecular composition of the fluids, effectiveness of seals, and original and current temperatures.
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Use of [[Normal hydrostatic pressure gradients|normal pressure gradients]] only gives an approximation for estimating pressure in a [[burial history]] analysis. It is difficult, if not impossible, to be more precise because there are so many other unknowns, such as pressure and temperature at the [[charging]] stage, molecular composition of the fluids, effectiveness of [[seal]]s, and original and current temperatures.
  
 
==See also==
 
==See also==
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* [[Predicting abnormal pressures]]
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* [[Abnormal hydrostatic pressure]]
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* [[Analysis of mud weights]]
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* [[Abnormal pressure prediction]]
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* [[Analysis of cuttings]]
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* [[Normal hydrostatic pressure gradients]]
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* [[Analysis of well-log and seismic data]]
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* [[Pressure prediction: analysis of mud weights]]
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* [[Pressure prediction: analysis of cuttings]]
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* [[Pressure prediction: analysis of well-log and seismic data]]
  
 
==External links==
 
==External links==
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[[Category:Critical elements of the petroleum system]]  
 
[[Category:Critical elements of the petroleum system]]  
 
[[Category:Formation fluid pressure and its application]]
 
[[Category:Formation fluid pressure and its application]]
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[[Category:Treatise Handbook 3]]

Latest revision as of 17:56, 17 February 2022

 It has been suggested that this article be merged with [[::Pressure prediction|Pressure prediction]]. (Discuss)
Exploring for Oil and Gas Traps
Series Treatise in Petroleum Geology
Part Critical elements of the petroleum system
Chapter Formation fluid pressure and its application
Author Edward A. Beaumont, Forrest Fiedler
Link Web page
Store AAPG Store

Reconstructing the burial history of a play area gives an estimate of vertical displacement by either burial or faulting of at least an order of magnitude of measurement. A pressure-depth plot, using the estimate of vertical displacement and normal fluid gradients, helps reveal the magnitude of the pressure abnormality that might be present if seals were in place at the appropriate time to trap the abnormal pressure.

Procedure: predicting fluid pressure

To predict the fluid pressure of a sealed container using burial history analysis, use the procedure outlined below.

  1. Plot the normal pressure gradient that existed when the container was sealed.
  2. Plot the present gradient, adding the new depth of burial.

Example

Figure 1 Burial stages 1, 2, and 3 and the corresponding pressure-depth relationships.

In the case of a sand body carried deeper by a growth fault, first plot the normal gradients that would have existed prior to burial; then replot the gradients at the existing depth.

The diagrams in Figure 1 illustrate burial stages 1, 2, and 3 and the corresponding pressure-depth relationships.

Using normal pressure gradient

Use of normal pressure gradients only gives an approximation for estimating pressure in a burial history analysis. It is difficult, if not impossible, to be more precise because there are so many other unknowns, such as pressure and temperature at the charging stage, molecular composition of the fluids, effectiveness of seals, and original and current temperatures.

See also

External links

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