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Special field techniques (view source)
Revision as of 19:38, 21 January 2014
, 19:38, 21 January 2014Initial import
{{publication
| image = exploring-for-oil-and-gas-traps.png
| width = 120px
| series = Treatise in Petroleum Geology
| title = Exploring for Oil and Gas Traps
| part = Predicting the occurrence of oil and gas traps
| chapter = Value of geological fieldwork
| frompg = 19-1
| topg = 19-42
| author = Denise M. Stone
| link = http://archives.datapages.com/data/specpubs/beaumont/ch19/ch19.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
==Magellans and GPS positioning==
Magellans and GPS positioning devices offer a handy way to find your location with respect to surface maps. Latitude and longitude coordinates are read from a lightweight, hand-held device that determines position by triangulating with functioning satellites overhead. Coordinates are particularly useful when making numerous road stops and can be input into a computer for plotting.
==Outcrop gamma-ray logging==
Outcrop gamma-ray logging can be a valuable technique for stratigraphic correlation. It allows a quantitative tie between surface and subsurface using a measurement common to both: the gamma-ray curve. This kind of tie can be more credible than “jump correlating” (identifying events on noncontiguous seismic records or lithologic horizons on well logs, separated by distance, as the same or correlative interfaces in the earth), particularly when significant distance is involved.
Two methods of outcrop gamma-ray logging are currently in use:
* Truck-mounted gamma-ray sonde
* Hand-held scintillometer
These tools measure the surface gamma radiation signature emitted by sedimentary outcrops. The data collected can be used to compare and correlate to subsurface sedimentary sections whose radiation signature is measurable only with sophisticated downhole wireline logging tools. Gamma radiation is the most commonly used data set to correlate stratigraphy laterally.
==Shallow coring==
Surface outcrop samples of a given formation are assumed to be the best available example of that same formation at depth. If this isn't the case, though, another approach exists. A shallow coring program is a cost-effective way to obtain surface geologic data in areas of limited outcrops, severe surface weathering, thick vegetation, and/or thin alluvial cover. A seismic shot hole or water well drilling rig can be strategically positioned for collecting such samples.
==See also==
* [[Helpful field practices]]
* [[Gathering data]]
* [[Influencing decisions]]
* [[Avoiding problems]]
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch19/ch19.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]
[[Category:Predicting the occurrence of oil and gas traps]]
[[Category:Value of geological fieldwork]]
| image = exploring-for-oil-and-gas-traps.png
| width = 120px
| series = Treatise in Petroleum Geology
| title = Exploring for Oil and Gas Traps
| part = Predicting the occurrence of oil and gas traps
| chapter = Value of geological fieldwork
| frompg = 19-1
| topg = 19-42
| author = Denise M. Stone
| link = http://archives.datapages.com/data/specpubs/beaumont/ch19/ch19.htm
| pdf =
| store = http://store.aapg.org/detail.aspx?id=545
| isbn = 0-89181-602-X
}}
==Magellans and GPS positioning==
Magellans and GPS positioning devices offer a handy way to find your location with respect to surface maps. Latitude and longitude coordinates are read from a lightweight, hand-held device that determines position by triangulating with functioning satellites overhead. Coordinates are particularly useful when making numerous road stops and can be input into a computer for plotting.
==Outcrop gamma-ray logging==
Outcrop gamma-ray logging can be a valuable technique for stratigraphic correlation. It allows a quantitative tie between surface and subsurface using a measurement common to both: the gamma-ray curve. This kind of tie can be more credible than “jump correlating” (identifying events on noncontiguous seismic records or lithologic horizons on well logs, separated by distance, as the same or correlative interfaces in the earth), particularly when significant distance is involved.
Two methods of outcrop gamma-ray logging are currently in use:
* Truck-mounted gamma-ray sonde
* Hand-held scintillometer
These tools measure the surface gamma radiation signature emitted by sedimentary outcrops. The data collected can be used to compare and correlate to subsurface sedimentary sections whose radiation signature is measurable only with sophisticated downhole wireline logging tools. Gamma radiation is the most commonly used data set to correlate stratigraphy laterally.
==Shallow coring==
Surface outcrop samples of a given formation are assumed to be the best available example of that same formation at depth. If this isn't the case, though, another approach exists. A shallow coring program is a cost-effective way to obtain surface geologic data in areas of limited outcrops, severe surface weathering, thick vegetation, and/or thin alluvial cover. A seismic shot hole or water well drilling rig can be strategically positioned for collecting such samples.
==See also==
* [[Helpful field practices]]
* [[Gathering data]]
* [[Influencing decisions]]
* [[Avoiding problems]]
==External links==
{{search}}
* [http://archives.datapages.com/data/specpubs/beaumont/ch19/ch19.htm Original content in Datapages]
* [http://store.aapg.org/detail.aspx?id=545 Find the book in the AAPG Store]
[[Category:Predicting the occurrence of oil and gas traps]]
[[Category:Value of geological fieldwork]]