- Industry: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
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Pertaining to minerals or materials that grow in place with a rock, rather than having been transported and deposited. These include quartz, chlorite and other pore-filling minerals or cements that grow during diagenesis. Evaporite minerals are authigenic, or formed in situ.
Industry:Oil & gas
Pertaining to minerals or igneous rocks composed of minerals that are rich in iron and magnesium, dense, and typically dark in color. The term comes from the words magnesium and ferric. Common mafic minerals are olivine and pyroxene. Basalt is a mafic igneous rock. (Compare with felsic. )
Industry:Oil & gas
Pertaining to minerals or igneous rocks composed of minerals such as quartz and feldspar that are relatively light in color and density. The word comes from the terms feldspar and silica. Granite is a felsic igneous rock. (Compare with mafic. )
Industry:Oil & gas
Pertaining to materials, particularly rock masses, that formed somewhere other than their present location, and were transported by fault movements, large-scale gravity sliding, or similar processes. Autochthonous material, in contrast, formed in its present location. Landslides can result in large masses of allochthonous rock, which typically can be distinguished from autochthonous rocks on the basis of their difference in composition. Faults and folds can also separate allochthons from autochthons.
Industry:Oil & gas
Pertaining to material that possesses little or no cementitious value, but that is capable of reacting chemically with calcium hydroxide at ordinary temperatures to form compounds with cementitious properties.
Industry:Oil & gas
Pertaining to logs that measure the properties of electromagnetic waves as they move through a formation. Measurements-while-drilling (MWD) propagation resistivity logs work between about 100 kHz and 10 MHz. Dielectric propagation logs work between 20 and 200 MHz. Logs made above 200 MHz and into the GHz range are known as electromagnetic propagation logs. Below about 100 kHz, the measurements are based on the properties of standing waves, not of propagation. Induction and laterolog tools work in this range.
Industry:Oil & gas
Pertaining to hot fluids, particularly hot water, or the activity of hot water, or precipitates thereof. Hydrothermal alteration can change the mineralogy of rock, producing different minerals, including quartz, calcite and chlorite. Hydrothermal activity is commonly associated with hot water that accompanies, or is heated by, magma.
Industry:Oil & gas
Pertaining to equipment, facilities or systems that are located in the production train after the surface choke, typically attached or close to the Christmas tree.
Industry:Oil & gas
Pertaining to equipment, facilities or systems located in the wellbore or production train above the surface choke or Christmas tree.
Industry:Oil & gas
Pertaining to crude oil or natural gas lacking appreciable amounts of sulfur or sulfur compounds.
Industry:Oil & gas
