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Well logging, also known as borehole logging is the practice of making a detailed record (a well log) of the geologic formations penetrated by a borehole.The log may be based either on visual inspection of samples brought to the surface (geological logs) or on physical measurements made by instruments lowered into the hole (geophysical logs).
[1] [2] These documents include maps, field notes and well logs relevant to geothermal exploration and development. Some of the information was originally gathered for use by the oil industry. [ 3 ] NGDS facilitates the digitization of this data, and ensures that data from various sources is stored in a compatible format to facilitate ...
The crater is buried beneath 75 to 200 feet (23–60 m) of glacial till and can only be seen as a series of faults and deformations in well logs and seismic surveys. [3] Faulting in the structure has produced as much as 600 feet (180 m) of vertical displacement. [3]
Resistivity logging is used in mineral exploration (for example for exploration for iron and copper ore bodies), geological exploration (deep geological disposal, geothermal wells), and water-well drilling. It is an indispensable tool for formation evaluation in oil- and gas-well drilling.
The earliest Carboniferous rocks sit conformably on top of the youngest Devonian in Illinois; Carboniferous rocks in the state are areally extensive, regionally very well-exposed, and form a large percentage of the state's bedrock. Illinois remained marine for much of the Carboniferous, with limestones making up most of the rock deposited ...
Composite wireline log for the Lisburne 1 well, Alaska - the neutron and density logs used radioactive sources. Sealed radioactive sources are routinely used in formation evaluation of both hydraulically fractured and non-fracked wells.
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An API well number can have up to 14 digits divided by dashes as follows: Example: 42-501-20130-03-00 [7] The "42" means that this well is located in "State Code" 42 which is Texas. The "501" means that this well is located in "County Code" 501 which is Yoakum County. The "20130" is a "Unique Well Identifier" within the county.