- Settore: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
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Pertaining to two or more logging curves that have been aligned in depth. Logs recorded on different runs will not be exactly aligned at all depths because of the difficulty of perfect depth control. If the two logs are offset by the same amount throughout the log, then only a simple depth shift is required. If the offset varies, then the logs need to be depth matched. <br><br>Depth matching is simplest if both runs contain the same type of log, such as a gamma ray. The two gamma rays can then be aligned, either manually or with software, and the other logs shifted by the same amount. Otherwise the alignment is based on two logs that respond in a similar fashion, such as a neutron porosity and a shallow laterolog. <br><br>Depth matching also may be needed for logs recorded on the same run. Although there is a fixed distance between the measure points and the depth reference, the apparent distance will vary if the tool moves unevenly up the hole, due to stick and slip or yo-yo effects. Depth matching is then necessary.
Industry:Oil & gas
Pertaining to traces that have the same offset, or distance between source and receiver.
Industry:Oil & gas
Pertaining to treatments performed on subsea wells where the fluids and associated pump-down equipment, such as plugs or darts, are pumped through the flowline normally used for production fluids.
Industry:Oil & gas
Pertaining to traces that have a different source but share a receiver.
Industry:Oil & gas
Pertaining to the subaerial (as opposed to submarine) environment, action and products of a stream or river on its floodplain, usually consisting of detrital clastic sediments, and distinct from subaqueous deposition such as in lakes or oceans and lower energy fluvial deposition. Sediments deposited in an alluvial environment can be subject to high depositional energy, such as fast-moving flood waters, and may be poorly sorted or chaotic.
Industry:Oil & gas
Pertaining to the environment of deposition of sediments by wind, such as the sand dunes in a desert. Because fine-grained sediments such as clays are removed easily from wind-blown deposits, eolian sandstones are typically clean and well-sorted.
Industry:Oil & gas
Pertaining to the environment of deposition and the organisms of the ocean between depths of 200 m (656 ft), the edge of the continental shelf, and 2000 m (6560 ft). The bathyal environment is intermediate between the neritic environment and the abyss.
Industry:Oil & gas
Pertaining to the preference of a solid to be in contact with an oil phase rather than a water or gas phase. Oil-wet rocks preferentially imbibe oil. Generally, polar compounds or asphaltenes deposited from the crude oil onto mineral surfaces cause the oil-wet condition. Similar compounds in oil-base mud also can cause a previously water-wet rock to become partially or totally oil-wet.
Industry:Oil & gas
Pertaining to the detection of the Earth's gravitational field within a wellbore. Subtle vertical variations of the Earth's gravity field may be detected over the length of a borehole. These depend on the variations in the formation density not only above and below the sensor, but also laterally away from the borehole. Thus, borehole gravity measurements may be used to detect the following phenomena:<br><br>- overburden pressure<br><br>- lateral formation density changes arising from porosity changes away from the borehole (fracture fields, vugs)<br><br>- lateral proximity to lithology changes, such as major faulting or salt intrusions<br><br>- time-lapse density measurements to monitor fluid saturation changes during the life of a reservoir. <br><br><br>In borehole gravity measurements, highly accurate formation density measurements, averaged over a large volume, may be made by comparing changes of gravity between measurement stations.
Industry:Oil & gas
