翻訳と辞書
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・ Densitation
・ Densities of the elements (data page)
・ Densitometer
・ Densitometry
・ Density
・ Density (disambiguation)
・ Density (polytope)
・ Density 21.5
・ Density altitude
・ Density contrast
・ Density Cup
・ Density dependence
・ Density estimation
・ Density functional theory
・ Density gradient
Density logging
・ Density matrix
・ Density matrix embedding theory
・ Density matrix renormalization group
・ Density meter
・ Density of air
・ Density of states
・ Density on a manifold
・ Density theorem
・ Density theorem for Kleinian groups
・ Density wave theory
・ Denslows Island, Bermuda
・ Densmore
・ Densmore and LeClear
・ Densmore Maxon


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Density logging : ウィキペディア英語版
Density logging

Density logging is a well logging tool that can provide a continuous record of a formation's bulk density along the length of a borehole. In geology, bulk density is a function of the density of the minerals forming a rock (i.e. matrix) and the fluid enclosed in the pore spaces. This is one of three well logging tools that are commonly used to calculate porosity, the other two being sonic logging and neutron porosity logging
==History & Principle==
The tool was initially developed in the 1950s and was in use throughout the hydrocarbon industry by the 1960s. A type of active nuclear tool, a radioactive source and detector are lowered down the borehole and the source emits medium-energy gamma rays into the formation. Radioactive sources are typically a directional Cs-137 source. These gamma rays interact with electrons in the formation and are scattered in an interaction known as Compton scattering. The number of scattered gamma rays that reach the detector, placed at a set distance from the emitter, is related to the formation's electron density,〔Gluyas, J. & Swarbrick, R. (2004) Petroleum Geoscience. Publ. Blackwell Publishing. p32〕 which itself is related to the formation's bulk density (\rho_\text) via
:\rho_\text = 2\rho_\text \ \frac
where Z is the atomic number, and A is the molecular weight of the compound. For most elements Z/A is about 1/2 (except for hydrogen where this ratio is 1). The electron density (\rho_\text) in g/cm³ determines the response of the density tool.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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