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  2. Electrode array - Wikipedia

    Schlumberger (Wenner) Wenner alpha; Wenner beta; Wenner gamma; Pole-pole; Dipole-dipole; Pole-dipole; Equatorial dipole-dipole; Resistivity. Resistivity measurement of bulk materials is a frequent application of electrode arrays. The figure shows a Wenner array, one of the possible ways of achieving this.

  3. Casing (borehole) - Wikipedia

    Casing is a large diameter pipe that is assembled and inserted into a recently drilled section of a borehole.Similar to the bones of a spine protecting the spinal cord, casing is set inside the drilled borehole to protect and support the wellstream.

  4. Schlumbergera - Wikipedia

    Schlumbergera is a small genus of cacti with six to nine species found in the coastal mountains of south-eastern Brazil.These plants grow on trees or rocks in habitats that are generally shady with high humidity, and can be quite different in appearance from their desert-dwelling cousins.

  5. Portal:Companies/Index by industry - Wikipedia

    Welcome to Wikipedia's companies portal, which seeks to analyse companies by country and industry. Contents: Associated Wikimedia • Categorical index • Did you know? • Index by industry • List of good and featured articles • Related portals • Selected article • Selected picture • Selected ranking • Things you can do

  6. Well logging - Wikipedia

    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).

  7. Spontaneous potential - Wikipedia

    Schlumberger Chart SP-2 can then be used to convert R we to obtain R w. Applications on the surface [ edit ] Electrodes can be placed on the ground surface to map relative changes in the SP value (in millivolts , or mV), typically with the goal of identifying the path of groundwater flow in the subsurface, or seepage from an earthen dam .

  8. Petroleum trap - Wikipedia

    An anticline is an area of the subsurface where the strata have been pushed into forming a domed shape. If there is a layer of impermeable rock present in this dome shape, then hydrocarbons can accumulate at the crest until the anticline is filled to the spill point - the highest point where hydrocarbons can escape the anticline.

  9. Perforation (oil well) - Wikipedia

    A perforation in the context of oil wells refers to a hole punched in the casing or liner of an oil well to connect it to the reservoir.Creating a channel between the pay zone and the wellbore to cause oil and gas to flow to the wellbore easily.