TVD meaning in Earth Science ?

Answer:

What is True Vertical Depth mean?

True vertical depth[1] is the measurement of a straight line perpendicularly downwards from a horizontal plane.

In the petroleum industry, true vertical depth, abbreviated as TVD, is the measurement from the surface to the bottom of the borehole (or anywhere along its length) in a straight perpendicular line represented by line (a) in the image.

Line (b) is the actual borehole and its length would be considered the "measured depth" in oil industry terminology. The TVD is always equal to or less than (≤) the measured depth. If you imagine line (b) were a piece of string and pull it straight down, you would see that it would be longer than line (a). This example oil well would be considered a directional well because it deviates from a straight vertical line.

reference

Full Form	Category
Travel Volunteer Dream	Community
Ticket Validation Database	Computing
Tv Device	Computing
Trace Vector Decoder	Computing
Total Virus Defence	Computing
Tennessee Valley Divide	Earth Science
True Vertical Depth	Earth Science
Dvd (digital Video Disc) for Television	Electronics
tal Variation Diminishing	General
Time Varying Densities	General
Transmissible Virus Dementia	General
Tal Vertical Depth	General
Truncal Vagotomy and Drainage	General
Target Value Design	General
Team of Volunteer Doctors	General
Tour Van Design	General
The Vinyl District	General
Torque Vectoring Differential	General
Throttle Valve Delete	General
Tudor Vladimirescu Diesel	General
Total Vehicle Distance	General
Trade Van Driver	General
The Vampire Diaries	General
Torque Velocity Dynamometer	Governmental
TVD	Indian Railway Station
Total Variation Diminishing	Maths
Turbo Viterbi Decoder	Maths
Triple Vessel Disease	Medical
Tricuspid Valve Dysplasia	Medical
Total Virus Defense	Medical
Tuvaluan dollar	Regional