Search results
Results from the WOW.Com Content Network
In the petroleum industry, lithology, or more specifically mud logging, is the graphic representation of geological formations being drilled through and drawn on a log called a mud log. As the cuttings are circulated out of the borehole , they are sampled, examined (typically under a 10× microscope) and tested chemically when needed.
Petroleum geology is the study of the origins, occurrence, movement, ... Mud log in process, a common way to study the lithology when drilling oil wells.
The combination of neutron and density logs takes advantage of the fact that lithology has opposite effects on these two porosity measurements. The average of neutron and density porosity values is usually close to the true porosity, regardless of lithology. Another advantage of this combination is the "gas effect."
Mud logging is usually performed by a third-party mud logging company. This provides well owners and producers with information about the lithology and fluid content of the borehole while drilling. Historically it is the earliest type of well log.
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).
Lithology: A description of the rock's physical characteristics, such as grain size, composition and texture. [4] By studying the lithology of local geological outcrops and core samples, geoscientists can use a combination of log measurements, such as natural gamma, neutron, density and resistivity, [2] to determine the lithology down the well.
This equation is very popular in petroleum exploration because it can provide information about the lithology from interval velocities obtained from seismic data. The constants α {\displaystyle \alpha } and β {\displaystyle \beta } are usually calibrated from sonic and density well log information but in the absence of these, Gardner's ...
The Brown Dense limestone is an informal name used by petroleum geologists for a layer of rock that lies beneath large parts of southern Arkansas and northwest Louisiana. The Brown Dense is a 300- to 500-foot thick interval within organic-rich, fine-grained carbonate rock that comprise the Lower Member of the Smackover Formation.