From SEG Wiki
Jump to navigation Jump to search

Gravimetry is the science of the Earth’s gravimetric field. The gravimetric field is sensitive to subsurface density variation. Density is rock property which constrains the geology and tectonic/geologic evolution. The method is described through potential field theory, in which the data are spatial derivatives of gravimetry potential. Potential field methods are inexpensive, but of low resolution and suffer from non-uniqueness. In practical applications, gravimetry must always be supported by additional information. The method is the oldest and most established geophysical technique that has long tradition in mining technology. In oil and gas industry, gravimetry is used for quick and inexpensive low-resolution mapping of large areas in frontier exploration.

Work Flow

The main headings in the article are second level headings, defined with two equals signs in the wikitext. You never need to use the top-level heading style, defined with one equals sign, as it is reserved for article titles. As with a scientific article, you have plenty of freedom about how to organize your content, but the reader may have some expectations about the order and style that you may want to take into account.

This Produces
== This == This

Start with a brief bit of background about the subject. Relate it to other topics, using plenty of links. Create links with a pair of square brackets around key technical words and phrases.



You can add as many sections as you think you need to 'spiral out' from the core of the topic. Use judgment to decide when to split out a separate article.


In longer articles, it may make sense to have another level of headings. There are not many occasions when you will need to use H4 headings (four = signs), so don't go there unless it's unavoidable. Never use more than four.[1]


If you have used <ref> tags in the text, you need a References section. Use {{reflist}} as a prettier and more flexible alternative to the more esoteric <references /> tag.

  1. Matt Hall, 2013, pers. comm. Sorry, this is the best reference I can find.

See also

Most articles should have a See also section, containing a list of other closely related articles in this wiki.

Important Papers

This section allows contributors to point to other important papers or books that have been written on the subject matter.

External links

Add the {{search}} template and any other relevant external links in the section.


Categories are listed at the very bottom of the article.

Additional help


General Workflow:

Gravimetry acquisition:

Satellite missions:

  • Low resolution, global coverage
  • Suitable for studies of temporal global field variations
  • Suitable for regional geologic modelling and interpretation

Airborne/marine acquisition:

  • Medium resolution, relatively quick
  • Suitable for regional to local geologic studies
  • Most used for oil and gas industry and mining
  • Used in frontier exploration (prior to seismic)

Terrestrial acquisition:

  • High resolution, low coverage
  • Suitable for local studies
  • Application in engineering and near surface application (cavity detection, unexploded ordnance - UXO - detection).

Gravity anomalies:

Free-air anomaly

Bouguer anomaly

Isostatic anomaly

Gravimetry techniques:

2D forward modelling


Free-air anomaly: The free-air correction is the amount that must be added to measurement at height h to correct to the reference level.

European Alps where gravity data is collected.jpg
Free-air anomalies.jpg

Bouguer anomaly: The Bouguer correction is the amount corrected for the height and the attraction of the terrain (free-air corrected and terrain corrected).

Iran profile for processing gravimetry data.png
Geoid Undulation of the Iran profile.jpg
Free Air Iran.jpg
Bouguer Iran.jpg
Free Air, Bouguer, Geoid undulation comparision.jpg