Log ASCII file format
PROPERTY WELLBORE Name
REFERENCE ReferenceName
[PTYPE PropertyTemplate PropertyUnit]
[PCLASS ClassName ClassValue ClassRed ClassGreen ClassBlue [ClassAlpha]
....]
[DEPTHUNIT DepthUnit]
[COLOR Red Green Blue [Alpha]]
[UNKNOWN UnknownValue]
TOP TopAhd
[BASE BaseAhd]
INCREMENT Increment
[SCALETYPE ScaleType]
[LEFTSCALE LeftScale]
[RIGHTSCALE RightScale]
Reading
....
Keywords (the order of these keywords does not matter, except from the OBJECT keyword – this keyword should always be the first one – and that the Readings are always at the end)
| Keyword | Description | Optional | Comment |
|---|---|---|---|
|
WELLBORE |
Specifies the corresponding object type for this property |
No |
One value is expected: 1. Name of the object |
|
DEPTHUNIT |
Specifies the depth units |
Yes |
One value is expected: 1. Depth unit (Default = m) For the Depth the unit can be: 1. m (meter) – default unit 2. ft (feet) When this keyword is not included, the default unit is applied. |
|
TOP |
Specifies the top (start) along hole depth value of this log |
No |
One value is expected: 1. TopAhd |
|
BASE |
Specifies the base (end) along hole depth value of this log |
Yes |
One value is expected: 1. BaseAhd When this keyword is not found, the BaseAhd will be calculated from the TopAhd + Increment * Number of Readings |
|
INCREMENT |
Specifies the log increment (step size) |
Yes |
One value is expected: 1. Increment When this keyword is not found the log is treated as a MD log. Meaning the value column has to have 2 values specified: MD & value. |
|
SCALETYPE |
Specifies the log scaletype |
Yes |
One value is expected: 1. ScaleType (Default = linear) When this keyword is not found in the file, the default scaletype will be used (linear) |
|
LEFTSCALE |
Specifies the left log scale (absolute minimum) |
Yes |
One value is expected: 1. Left scale When this keyword is not found, the minimum value of all log readings will be used as LeftScale |
|
RIGHTSCALE |
Specifies the right log scale (absolute maximum) |
Yes |
One value is expected: 1. Right scale When this keyword is not found, the maximum value of all log readings will be used as RightScale |
Variables
| Variable | Description | Type | Min | Max | Comment |
|---|---|---|---|---|---|
|
DepthUnit |
Depth unit to be used |
string |
- |
- |
Default = m |
|
TopAhd |
Along hole depth position of the start position in the wellbore |
double |
- |
< BaseAhd |
|
|
BaseAhd |
Along hole depth position of the start position in the wellbore |
double |
> TopAhd |
- |
|
|
Increment |
Increment step size of the log readings |
double |
|||
|
ScaleType |
Log scale type |
int |
0 |
1 |
0 = Linear 1 = Logarithmic |
|
LeftScale |
Left scale value |
double |
- |
- |
|
|
RightScale |
Right scale value |
double |
- |
- |
|
|
Reading |
Log value |
double |
- |
- |
List of reading in incremental ahd order, starting from TopAhd |
Example 1:
PROPERTY WELLBORE Porosity
REFERENCE WellBore1
PTYPE Porosity volume fraction
UNKNOWN -999.0
DEPTHUNIT M
COLOR 0 255 255 255
TOP 100
BASE 550
INCREMENT 0.2
SCALETYPE 1
LEFTSCALE 0
RIGHTSCALE 1
0.18808
0.18808
0.18808
0.18808
0.18808
0.17944
0.17944
0.17944
0.17944
…
0.2256
0.2256
0.2256
0.22752
0.22464
0.22656
0.22656
0.22176
0.216
click to enlarge
Example 2 (discrete log example):
PROPERTY WELLBORE Lithology
REFERENCE WellBore1
PTYPE Lithology -
PCLASS MySand1 0 255 0 0 255
PCLASS MySand2 1 255 120 0 255
PCLASS MySand3 2 255 120 120 255
PCLASS MySand4 3 120 255 0 255
PCLASS MySand5 4 125 0 120 255
PCLASS MySand6 5 0 230 210 255
UNKNOWN -999.0
DEPTHUNIT M
COLOR 255 0 255 255
TOP 100
BASE 550
INCREMENT 5
SCALETYPE 1
LEFTSCALE 0
RIGHTSCALE 5
1
1
1
1
1
1
1
…
4
4
4
5
5
5
5
5
5
5
click to enlarge
Example 3 (minimum / all optional fields left out):
PROPERTY WELLBORE Porosity
REFERENCE Well5
TOP 500
INCREMENT 10
0.1880
0.1880
0.1880
0.1880
0.2256
0.2256
0.2275
0.1880
0.1794
0.1794
0.1794
0.1794
0.2256
0.2256
0.2256
0.2275
0.2246
0.1880
0.1880
0.1794
0.1794
0.2265
0.2265
0.2217
0.2164
click to enlarge
Example 4 (Multiple logs with column separated values):
PROPERTY WELLBORE Porosity
REFERENCE WellBore1
PTYPE Porosity volume fraction
UNKNOWN -999.0
DEPTHUNIT M
COLOR 0 0 255 255
TOP 100
BASE 550
INCREMENT 0.2
SCALETYPE 1
LEFTSCALE 0
RIGHTSCALE 1
PROPERTY WELLBORE Saturation
REFERENCE WellBore1
PTYPE Saturation volume fraction
UNKNOWN -999.0
DEPTHUNIT M
COLOR 0 192 0 255
TOP 100
BASE 550
INCREMENT 0.2
SCALETYPE 1
LEFTSCALE 0
RIGHTSCALE 1
0.18808 0.24384
0.18808 0.24384
0.18808 0.24384
0.18808 0.24384
0.18808 0.24
0.17944 0.24
0.17944 0.23808
0.17944 0.23808
0.17944 0.23328
0.17944 0.23328
0.18712 0.20928
…
0.2256 0.18048
0.2256 0.18048
0.2256 0.18336
0.22752 0.18336
0.22464 0.19776
0.22656 0.19776
0.22656 0.20352
0.22176 0.20352
0.216 0.18816
click to enlarge
PROPERTY WELLBORE INC
REFERENCE Well
PTYPE Dip deg
CATEGORY Geometrical
UNKNOWN -999.25
COLOR 0 0 255 255
DEPTHUNIT ft
TOP 503.781
BASE 9900
SCALETYPE 1
LEFTSCALE 0
RIGHTSCALE 91.95
153.552 0.0245237
154.552 0.0490471
155.552 0.0735706
156.552 0.098094
157.552 0.122617
158.552 0.147141
159.552 0.171664
160.552 0.196188
161.552 0.220711
162.552 0.245235
163.552 0.269758
164.552 0.294282
165.552 0.318805
166.552 0.343329
167.552 0.367852
167.64 0.37
168.64 0.367375
169.64 0.364751
170.64 0.362126
171.64 0.359501
172.64 0.356877
173.64 0.354252
174.64 0.351627
175.64 0.349003
176.64 0.346378
177.64 0.343753
178.64 0.341129
179.64 0.338504
180.64 0.335879
181.64 0.333255
182.64 0.33063
182.88 0.33
click to enlarge