Changes

  | part    = Predicting the occurrence of oil and gas traps

  | part    = Predicting the occurrence of oil and gas traps

  | chapter = Applying gravity in petroleum exploration

  | chapter = Applying gravity in petroleum exploration

  | frompg  = 15-1

  | frompg  = 15-5

  | topg    = 15-28

  | topg    = 15-6

  | author  = David A. Chapin, Mark E. Ander

  | author  = David A. Chapin, Mark E. Ander

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch15/ch15.htm

  | link    = http://archives.datapages.com/data/specpubs/beaumont/ch15/ch15.htm

  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

}}

}}

Gravity methods help us identify the size, shape, and depth of anomalous masses. Gravity effectively images lateral density contrasts within the subsurface. It is particularly good at locating geologic structures horizontally. However, it is not as good as [[magnetics]] in determining depth to source because density distributions tend to be diffuse in the subsurface.

Gravity methods help us identify the size, shape, and depth of anomalous masses. Gravity effectively images [[lateral]] density contrasts within the subsurface. It is particularly good at locating geologic structures horizontally. However, it is not as good as [[magnetics]] in determining depth to source because density distributions tend to be diffuse in the subsurface.

==Uses of gravity==

==Uses of gravity==

* Needs geological and geophysical constraints to interpret

* Needs geological and geophysical constraints to interpret

* Does not directly provide a structural cross section without additional geologic input

* Does not directly provide a structural [[cross section]] without additional geologic input

* Overlapping anomalies may confuse the interpretation

* Overlapping anomalies may confuse the interpretation

* Data quality may deteriorate in rougher terrain

* Data quality may deteriorate in rougher terrain

==Acquisition and instrumentation==

==Acquisition and instrumentation==

[[file:applying-gravity-in-petroleum-exploration_fig15-2.png|thumb|{{figure number|2}}Sensor consisting of a mass at the end of a spring.]]

[[file:applying-gravity-in-petroleum-exploration_fig15-2.png|300px|thumb|{{figure number|2}}Sensor consisting of a mass at the end of a spring.]]

Gravity can be collected on land, at sea, in the air, and by satellite. On land, sea, and air, most sensors consist of a mass at the end of a spring ([[:file:applying-gravity-in-petroleum-exploration_fig15-2.png|Figure 2]]). On land, the instrument is leveled and the mass is set to a null position for reading the spring tension.

Gravity can be collected on land, at sea, in the air, and by satellite. On land, sea, and air, most sensors consist of a mass at the end of a spring ([[:file:applying-gravity-in-petroleum-exploration_fig15-2.png|Figure 2]]). On land, the instrument is leveled and the mass is set to a null position for reading the spring tension.

==See also==

==See also==

 

* [[Processing gravity data]]

* [[Processing gravity data]]

* [[Interpreting gravity measurements]]

* [[Interpreting gravity measurements]]

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Predicting the occurrence of oil and gas traps]]  

[[Category:Applying gravity in petroleum exploration]]

[[Category:Applying gravity in petroleum exploration]]