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Depth and thickness conversion (view source)
Revision as of 20:41, 29 April 2014
, 20:41, 29 April 2014→Measured depth versus true vertical depth
Table 1 shows values for the percentage difference between measured depth and true vertical depth for varying degrees of deviation, and for the horizontal displacement (also as a percentage of measured depth) for a well segment of constant deviation. For most map and cross section scales, depth corrections for wells deviated less than 3′ are almost undetectable. For wells deviated by a larger number of degrees, large depth and horizontal displacement deviations could lead to substantial misplacements of a geological marker and the consequent distortion of structural and stratigraphic relationships.
Table 1 shows values for the percentage difference between measured depth and true vertical depth for varying degrees of deviation, and for the horizontal displacement (also as a percentage of measured depth) for a well segment of constant deviation. For most map and cross section scales, depth corrections for wells deviated less than 3′ are almost undetectable. For wells deviated by a larger number of degrees, large depth and horizontal displacement deviations could lead to substantial misplacements of a geological marker and the consequent distortion of structural and stratigraphic relationships.
{| class = "wikitable"
|-
|+ {{table number|1}}True vertical depth correction and horizontal displacement as a function of well deviation
|-
! rowspan = 2 | Deviation (α°) || colspan = 2 | Correction Factor (% of MD)
|-
! TVD || HD
| 1
| 0.02
| 1.75
|-
| 2
| 0.06
| 3.49
|-
| 3
| 0.14
| 5.23
|-
| 4
| 0.24
| 6.98
|-
| 5
| 0.38
| 8.72
|-
| 10
| 1.52
| 17.36
|-
| 15
| 3.41
| 25.88
|-
| 45
| 70.71
| 70.71
|}
==True stratigraphic thickness==
==True stratigraphic thickness==