HOME /

Glossary- Geophysical Terminology (U - Z)...   | A - F |G - M | N - T | Conversion Table |

U | V | W | X | Y | Z

U

V

Velocity panels. A set of stacked test sections with a progression of assumed normal-moveout velocities applied. A powerful method for determining velocities if distinct reflection events are present, as the reflections will be coherent where the velocities are correct and be degraded in appearance at higher or lower NMO velocities.

Variabledensity log (VDL). Also called 3-dimensional log; a log of the acoustic wave train that is recorded photographically, so that variations in darkness are related to the relative amplitude of the waves.

W

Well log. A record describing geologic formations and well testing or development techniques used during well construction. Often refers to a geophysical well log in which the physical properties of the formations are measured by geophysical tools, E-logs, neutron logs, etc.

X

Y

Z

Z/A effect. Ratio of the atomic number (Z) to the atomic weight (A), which affects the relation between the response of gamma-gamma logs and bulk density

Home | About This Site | Solution Matrix | Engineering Applications | Geophysical Methods | Glossary | Bibliography | Site Map USDOT | FHWA | FLHP Comments regarding this web manual may be forwarded to the CFLHD Geotechnical Team Problems with this site should be forwarded to webmaster@cflhd.gov