formation density
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Formation evaluation — In petroleum exploration and development, formation evaluation is used to determine the ability of a borehole to produce petroleum. Essentially, it is the process of recognizing a commercial well when you drill one .Modern rotary drilling usually … Wikipedia
Density logging — Well logging Gamma ray logging Spontaneous potential logging Resistivity logging Density logging Sonic logging Caliper logging Mud logging LWD/MWD v · … Wikipedia
Formation and evolution of the Solar System — Artist s conception of a protoplanetary disk The formation and evolution of the Solar System is estimated to have begun 4.568 billion years ago with the gravitational collapse of a small part of a giant molecular cloud … Wikipedia
Density wave theory — Image of spiral galaxy M81 combining data from the Hubble, Spitzer, and GALEX space telescopes. Density wave theory or the Lin Shu density wave theory is a theory proposed by C.C. Lin and Frank Shu in the mid 1960s to explain spiral arm structure … Wikipedia
Formation evaluation gamma ray — In the field of formation evaluation, gamma ray log records natural radioactivity emission of formation. Measurement of natural emission of gamma rays in oil and gas wells are particularly helpful because shales and sandstones typically have… … Wikipedia
Formation evaluation neutron porosity — In the field of formation evaluation, porosity is one of the key measurements to quantify an oil and gas reserves. Neutron porosity measurement employs neutron source to measure hydrogen index in a reservoir, which is directly related to porosity … Wikipedia
Formation and evolution of black holes — From the exotic nature of black holes, it is natural to question if such bizarre objects could actually exist in nature or that they are merely pathological solutions to Einstein s equations. However in 1970, Hawking and Penrose proved the… … Wikipedia
density current — Geol., Oceanog. See turbidity current. * * * Any current in either a liquid or a gas that is kept in motion by the force of gravity acting on small differences in density. A density difference can exist between two fluids or between different… … Universalium
Formation de Medusae Fossae — L expression informelle « formation de Medusae Fossae » souvent abrégée en MFF, pour Medusae Fossae Formation désigne une vaste région équatoriale de la planète Mars, située dans les quadrangles d Elysium, d Aeolis, de Memnonia et d… … Wikipédia en Français
Density contrast — The Density Contrast is a parameter used in galaxy formation to indicate where there are local enhancements in matter density. It is believed that after inflation, although the universe was mostly uniform, some regions were slightly denser than… … Wikipedia
Structure formation — refers to a fundamental problem in physical cosmology. The universe, as is now known from observations of the cosmic microwave background radiation, began in a hot, dense, nearly uniform state approximately 13.7 Gyr ago. [cite journal |author=D.… … Wikipedia
