Changes

==Outcrop gamma-ray logging==

==Outcrop gamma-ray logging==

Outcrop [[Basic open hole tools#Gamma ray|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.

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:

Two methods of outcrop gamma-ray logging are currently in use:

* Hand-held scintillometer

* 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.

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. (See [[Basic open  hole tools]].) Gamma radiation is the most commonly used data set to correlate stratigraphy laterally.

==Shallow coring==

==Shallow coring==