X

Track changes made to this page

If you find this page useful and would like to be notified of changes made to this page, start by inputting your email below.



Privacy policy
Close this window

powered by ChangeDetection

Difference between revisions of "0776091809000"

m
m
Line 3: Line 3:
 
{| class="wikitable welldetails" width="95%"
 
{| class="wikitable welldetails" width="95%"
 
| Well ID: 0776091809000
 
| Well ID: 0776091809000
| style="height=100%; align=center" rowspan="14" | {{#display_map: 55.69339999999999691, -119.37287099999997508 | width=100% | height=100% }}
+
| style="height=100%; align=center" rowspan="14" | {{#display_map: 55.6934, -119.372871 | width=100% | height=100% }}
 
|-
 
|-
 
| Location: 00/09-18-077-09W6/0
 
| Location: 00/09-18-077-09W6/0
 +
|-
 +
| Location Alias: 00/09-18-77-09 W6M
 +
|-
 +
| Location Alias 2: 00/09-18-077-09 W6/00
 +
|-
 +
| Province: Alberta
 +
|-
 +
| County/Municipality: [[Saddle Hills County,_Alberta|Saddle Hills County]]
 
|-
 
|-
 
| Well Name: KELT EXP PROGRESS 9-18-77-9
 
| Well Name: KELT EXP PROGRESS 9-18-77-9
 +
|-
 +
| Operator Name: [[Kelt Exploration Ltd.]]
 +
|-
 +
| License Number: 0454046
 
|-
 
|-
 
| License Date: 2013-01-23
 
| License Date: 2013-01-23
 
|-
 
|-
| Final Drilling Date: 2013-02-26
+
| License Status: Amended
 
|-
 
|-
| Total Depth: 4007.0m
+
| Spud Date: 2013-02-09
 
|-
 
|-
| Fluid Type: Crude Oil
+
| Final Drill Date: 2013-02-26
 
|-
 
|-
| Status: Pumping
+
| Well Total Depth: 4007 m
 
|-
 
|-
| Well Type: Not Applicable
+
| Surface Hole Latitude: 55.6934
 
|-
 
|-
| Configuration: Horizontal
+
| Surface Hole Longitude: -119.372871
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = General Well Data File - Licensing Data
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2018-05-09
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2018-05-14 }}</ref><ref>{{cite web
 +
| title = General Well Data File - Drilling Data
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2018-05-09
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2018-05-14 }}</ref>
 +
== Spud Table ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Spud Date
 +
!scope="col" | Contractor
 +
!scope="col" style="text-align: right;" | Rig Number
 +
!scope="col" style="text-align: right;" | New Projected Depth (m)
 +
!scope="col" | Activity Type
 
|-
 
|-
| Latitude: 55.69339999999999691
+
| 09 Feb 2013
 +
| [[Trinidad Drilling Ltd.]]
 +
| style="text-align: right;" | 60
 +
| style="text-align: right;" | N/A
 +
| Drill To LD
 
|-
 
|-
| Longitude: -119.37287099999997508
+
|}
 +
For data sources see<ref>{{cite web
 +
| title =ST49: Daily Spud and Drilling Activity List
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2018-04-30
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2018-05-14 }}</ref>
 +
== Directional Drilling ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Start Date
 +
!scope="col" style="text-align: right;" | Depth (m)
 +
!scope="col" | Reason
 
|-
 
|-
 +
| 2013-02-13
 +
| style="text-align: right;" | 1662
  
 +
|-
 +
| 2013-02-16
 +
| style="text-align: right;" | 2033
 +
| Horizontal
 +
|-
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = General Well Data File - Tour-Direction Drilling Data
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2018-05-09
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2018-05-14 }}</ref>
 +
== Perforation Treatments ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Perforation Date
 +
!scope="col" | Perforation Type
 +
!scope="col" style="text-align: right;" | Interval Top (m)
 +
!scope="col" style="text-align: right;" | Interval Base (m)
 +
!scope="col" style="text-align: right;" | Number of Shots
 +
|-
 +
| 2013-03-13
 +
| Open Hole/Barefoot Completion
 +
| style="text-align: right;" | 3997
 +
| style="text-align: right;" | 4007
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3985.6
 +
| style="text-align: right;" | 3985.7
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3969.5
 +
| style="text-align: right;" | 3969.6
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3865.8
 +
| style="text-align: right;" | 3865.9
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3752.6
 +
| style="text-align: right;" | 3752.7
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3627
 +
| style="text-align: right;" | 3627.1
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3500.4
 +
| style="text-align: right;" | 3500.5
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3374.9
 +
| style="text-align: right;" | 3375
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3248.5
 +
| style="text-align: right;" | 3248.6
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3123.9
 +
| style="text-align: right;" | 3124
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 3011
 +
| style="text-align: right;" | 3011.1
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 2885.1
 +
| style="text-align: right;" | 2885.2
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 2786.5
 +
| style="text-align: right;" | 2786.6
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 2686.9
 +
| style="text-align: right;" | 2687
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 2588.3
 +
| style="text-align: right;" | 2588.4
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 2475.2
 +
| style="text-align: right;" | 2475.3
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 2376.6
 +
| style="text-align: right;" | 2376.7
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 2223.4
 +
| style="text-align: right;" | 2223.5
 +
| style="text-align: right;" | 0
 +
|-
 +
| 2013-03-13
 +
| Multi-Stage Fracture
 +
| style="text-align: right;" | 2097.3
 +
| style="text-align: right;" | 2097.4
 +
| style="text-align: right;" | 0
 +
|-
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = General Well Data File - Tour-Perforation/Treatment Data
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2018-05-09
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2018-05-14 }}</ref>
 +
== Fracking Activities ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Start Date
 +
!scope="col" | End Date
 +
!scope="col" | Chemical Name
 +
!scope="col" style="text-align: right;" | CAS Number
 +
!scope="col" | Purpose
 +
!scope="col" style="text-align: right;" | Job Percentage
 +
!scope="col" | Supplier
 +
|- valign="top"
 +
| rowspan="21"| 03/13/2013
 +
| rowspan="21"| 03/13/2013
 +
| non-hazardous ingredients
 +
| style="text-align: right;" | Not Available
 +
| Bactericide/Biocide
 +
| style="text-align: right;" | 0.0101
 +
| Trican
 +
|-
 +
| water
 +
| style="text-align: right;" | 7732-18-5
 +
|
 +
| style="text-align: right;" | 74.2413
 +
|
 +
|-
 +
| silica crystalline
 +
| style="text-align: right;" | 14808-60-7
 +
|
 +
| style="text-align: right;" | 22.3719
 +
| Trican
 +
|-
 +
| 2.2-dibromo-3-nitrilopropionamide
 +
| style="text-align: right;" | 10222-01-2
 +
| Bactericide/Biocide
 +
| style="text-align: right;" | 0.0101
 +
| Trican
 +
|-
 +
| dibromoacetonitrile
 +
| style="text-align: right;" | 3252-43-5
 +
| Bactericide/Biocide
 +
| style="text-align: right;" | 0.0101
 +
| Trican
 +
|-
 +
| non-hazardous ingredients
 +
| style="text-align: right;" | Not Available
 +
| Bactericide/Biocide
 +
| style="text-align: right;" | 0.0101
 +
| Trican
 +
|-
 +
| polyethylene glycol
 +
| style="text-align: right;" | 25322-68-3
 +
| Bactericide/Biocide
 +
| style="text-align: right;" | 0.0101
 +
| Trican
 +
|-
 +
| sodium bromide
 +
| style="text-align: right;" | 7647-15-6
 +
| Bactericide/Biocide
 +
| style="text-align: right;" | 0.0101
 +
| Trican
 +
|-
 +
| ammonium persulfate
 +
| style="text-align: right;" | 7727-54-0
 +
| Breaker
 +
| style="text-align: right;" | 0.0134
 +
| Trican
 +
|-
 +
| cured acrylic resin
 +
| style="text-align: right;" | Not Available
 +
| Breaker
 +
| style="text-align: right;" | 0.0134
 +
| Trican
 +
|-
 +
| silica crystalline
 +
| style="text-align: right;" | 14808-60-7
 +
| Breaker
 +
| style="text-align: right;" | 0.0134
 +
| Trican
 +
|-
 +
| non-hazardous ingredients
 +
| style="text-align: right;" | Not Available
 +
| Buffer
 +
| style="text-align: right;" | 0.0641
 +
| Trican
 +
|-
 +
| 1.3-propanediaminium-2-substitued. -hexaalkyl-. di halide
 +
| style="text-align: right;" | 7744
 +
| Clay Control
 +
| style="text-align: right;" | 0.1678
 +
| Trican
 +
|-
 +
| formic acid
 +
| style="text-align: right;" | 64-18-6
 +
| Clay Control
 +
| style="text-align: right;" | 0.1678
 +
| Trican
 +
|-
 +
| non-hazardous ingredients
 +
| style="text-align: right;" | Not Available
 +
| Clay Control
 +
| style="text-align: right;" | 0.1678
 +
| Trican
 +
|-
 +
| borate salts
 +
| style="text-align: right;" | 1319-33-1
 +
| Crosslinker
 +
| style="text-align: right;" | 0.2042
 +
| Trican
 +
|-
 +
| distillates (petroleum). hydrotreated light
 +
| style="text-align: right;" | 64742-47-8
 +
| Crosslinker
 +
| style="text-align: right;" | 0.2042
 +
| Trican
 +
|-
 +
| non-hazardous ingredients
 +
| style="text-align: right;" | Not Available
 +
| Demulsifier
 +
| style="text-align: right;" | 0.0759
 +
| Trican
 +
|-
 +
| propylene glycol
 +
| style="text-align: right;" | 57-55-6
 +
| Demulsifier
 +
| style="text-align: right;" | 0.0759
 +
| Trican
 +
|-
 +
| distillates (petroleum). hydrotreated middle
 +
| style="text-align: right;" | 64742-46-7
 +
| Gelling Agent
 +
| style="text-align: right;" | 0.4647
 +
| Trican
 +
|-
 +
| polysaccharide blend
 +
| style="text-align: right;" | Not Available
 +
| Gelling Agent
 +
| style="text-align: right;" | 0.4647
 +
| Trican
 +
|-
 
|}
 
|}
 
For data sources see<ref>{{cite web
 
For data sources see<ref>{{cite web
  | title = ST37: List of Wells in Alberta
+
  | title = Hydraulic Fracturing Water Use Data (Annual)
 
|publisher = [[Alberta Energy Regulator]]
 
|publisher = [[Alberta Energy Regulator]]
| date = 2015-07-02
+
| date = 2017-12-31
 
  | url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 
  | url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
  | accessdate = 2015-07-14 }}</ref>
+
  | accessdate = 2018-05-14 }}</ref>
 +
== Water Sources ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Water Diversion Start Date
 +
!scope="col" | Water Diversion End Date
 +
!scope="col" | Water Source Type
 +
!scope="col" style="text-align: right;" | Total Water Volume (m<sup>3</sup>)
 +
|-
 +
| 3/11/2013
 +
| 3/13/2013 0:00
 +
| Municipal Water
 +
| style="text-align: right;" | 137
 +
|-
 +
| 3/9/2013 0
 +
| 3/11/2013 0:00
 +
| Surface Water - Runoff
 +
| style="text-align: right;" | 789
 +
|-
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = Hydraulic Fracturing Water Source Data (Annual)
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2017-12-31
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2018-05-14 }}</ref>
 +
== Production Data ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Period
 +
!scope="col" style="text-align: right;" | Total Production Hours
 +
!scope="col" style="text-align: right;" | Gas Quantity (m<sup>3</sup>)
 +
!scope="col" style="text-align: right;" | Oil Quantity (m<sup>3</sup>)
 +
!scope="col" style="text-align: right;" | Water Quantity (m<sup>3</sup>)
 +
|-
 +
| 2013
 +
| style="text-align: right;" | 6437
 +
| style="text-align: right;" | 1207.8
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 1879.5
 +
|-
 +
| 2014
 +
| style="text-align: right;" | 8090
 +
| style="text-align: right;" | 1394.6
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 1942.8
 +
|-
 +
| 2015
 +
| style="text-align: right;" | 5912
 +
| style="text-align: right;" | 958.7
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 1269.5
 +
|-
 +
| 2016
 +
| style="text-align: right;" | 7442
 +
| style="text-align: right;" | 1142.0
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 1323.4
 +
|-
 +
| 2017
 +
| style="text-align: right;" | 7513
 +
| style="text-align: right;" | 883.3
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 565.6
 +
|-
 +
| 2018
 +
| style="text-align: right;" | 4203
 +
| style="text-align: right;" | 735.0
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 812.2
 +
|-
 +
| 2019
 +
| style="text-align: right;" | 2124
 +
| style="text-align: right;" | 338.9
 +
| style="text-align: right;" | 0.0
 +
| style="text-align: right;" | 294.0
 +
|-
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = Well Production Data - All Alberta
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2018-04-24
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2018-05-14 }}</ref>
 +
== Occurences ==
 +
{| class="wikitable sortable" width="95%"
 +
!scope="col" | Occurence Date
 +
!scope="col" | Occurence Type
 +
!scope="col" style="text-align: right;" | Occurence Depth (m)
 +
!scope="col" style="text-align: right;" | Occurence Control Depth (m)
 +
|-
 +
| 2013-02-19
 +
| Lost Circulation
 +
| style="text-align: right;" | 2621.00
 +
| style="text-align: right;" | 4007.00
 +
|-
 +
| 2013-03-19
 +
| No Incident
 +
| style="text-align: right;" | N/A
 +
| style="text-align: right;" | N/A
 +
|-
 +
|}
 +
For data sources see<ref>{{cite web
 +
| title = General Well Data File - Tour-Occurence Data
 +
|publisher = [[Alberta Energy Regulator]]
 +
| date = 2018-05-09
 +
| url = http://wellwiki.org/wiki/Alberta_Oil_and_Gas_Data_Sources
 +
| accessdate = 2018-05-14 }}</ref>
 
==References==
 
==References==
 
+
<references/>
 
__NOEDITSECTION__
 
__NOEDITSECTION__
[[Category:Wells]]
+
[[Category:Alberta]][[Category:Wells]]
 +
[[Category:FracFocus]]

Revision as of 17:03, 9 June 2019

Well Details

Well ID: 0776091809000
Loading map...
Location: 00/09-18-077-09W6/0
Location Alias: 00/09-18-77-09 W6M
Location Alias 2: 00/09-18-077-09 W6/00
Province: Alberta
County/Municipality: Saddle Hills County
Well Name: KELT EXP PROGRESS 9-18-77-9
Operator Name: Kelt Exploration Ltd.
License Number: 0454046
License Date: 2013-01-23
License Status: Amended
Spud Date: 2013-02-09
Final Drill Date: 2013-02-26
Well Total Depth: 4007 m
Surface Hole Latitude: 55.6934
Surface Hole Longitude: -119.372871

For data sources see[1][2]

Spud Table

Spud Date Contractor Rig Number New Projected Depth (m) Activity Type
09 Feb 2013 Trinidad Drilling Ltd. 60 N/A Drill To LD

For data sources see[3]

Directional Drilling

Start Date Depth (m) Reason
2013-02-13 1662
2013-02-16 2033 Horizontal

For data sources see[4]

Perforation Treatments

Perforation Date Perforation Type Interval Top (m) Interval Base (m) Number of Shots
2013-03-13 Open Hole/Barefoot Completion 3997 4007 0
2013-03-13 Multi-Stage Fracture 3985.6 3985.7 0
2013-03-13 Multi-Stage Fracture 3969.5 3969.6 0
2013-03-13 Multi-Stage Fracture 3865.8 3865.9 0
2013-03-13 Multi-Stage Fracture 3752.6 3752.7 0
2013-03-13 Multi-Stage Fracture 3627 3627.1 0
2013-03-13 Multi-Stage Fracture 3500.4 3500.5 0
2013-03-13 Multi-Stage Fracture 3374.9 3375 0
2013-03-13 Multi-Stage Fracture 3248.5 3248.6 0
2013-03-13 Multi-Stage Fracture 3123.9 3124 0
2013-03-13 Multi-Stage Fracture 3011 3011.1 0
2013-03-13 Multi-Stage Fracture 2885.1 2885.2 0
2013-03-13 Multi-Stage Fracture 2786.5 2786.6 0
2013-03-13 Multi-Stage Fracture 2686.9 2687 0
2013-03-13 Multi-Stage Fracture 2588.3 2588.4 0
2013-03-13 Multi-Stage Fracture 2475.2 2475.3 0
2013-03-13 Multi-Stage Fracture 2376.6 2376.7 0
2013-03-13 Multi-Stage Fracture 2223.4 2223.5 0
2013-03-13 Multi-Stage Fracture 2097.3 2097.4 0

For data sources see[5]

Fracking Activities

Start Date End Date Chemical Name CAS Number Purpose Job Percentage Supplier
03/13/2013 03/13/2013 non-hazardous ingredients Not Available Bactericide/Biocide 0.0101 Trican
water 7732-18-5 74.2413
silica crystalline 14808-60-7 22.3719 Trican
2.2-dibromo-3-nitrilopropionamide 10222-01-2 Bactericide/Biocide 0.0101 Trican
dibromoacetonitrile 3252-43-5 Bactericide/Biocide 0.0101 Trican
non-hazardous ingredients Not Available Bactericide/Biocide 0.0101 Trican
polyethylene glycol 25322-68-3 Bactericide/Biocide 0.0101 Trican
sodium bromide 7647-15-6 Bactericide/Biocide 0.0101 Trican
ammonium persulfate 7727-54-0 Breaker 0.0134 Trican
cured acrylic resin Not Available Breaker 0.0134 Trican
silica crystalline 14808-60-7 Breaker 0.0134 Trican
non-hazardous ingredients Not Available Buffer 0.0641 Trican
1.3-propanediaminium-2-substitued. -hexaalkyl-. di halide 7744 Clay Control 0.1678 Trican
formic acid 64-18-6 Clay Control 0.1678 Trican
non-hazardous ingredients Not Available Clay Control 0.1678 Trican
borate salts 1319-33-1 Crosslinker 0.2042 Trican
distillates (petroleum). hydrotreated light 64742-47-8 Crosslinker 0.2042 Trican
non-hazardous ingredients Not Available Demulsifier 0.0759 Trican
propylene glycol 57-55-6 Demulsifier 0.0759 Trican
distillates (petroleum). hydrotreated middle 64742-46-7 Gelling Agent 0.4647 Trican
polysaccharide blend Not Available Gelling Agent 0.4647 Trican

For data sources see[6]

Water Sources

Water Diversion Start Date Water Diversion End Date Water Source Type Total Water Volume (m3)
3/11/2013 3/13/2013 0:00 Municipal Water 137
3/9/2013 0 3/11/2013 0:00 Surface Water - Runoff 789

For data sources see[7]

Production Data

Period Total Production Hours Gas Quantity (m3) Oil Quantity (m3) Water Quantity (m3)
2013 6437 1207.8 0.0 1879.5
2014 8090 1394.6 0.0 1942.8
2015 5912 958.7 0.0 1269.5
2016 7442 1142.0 0.0 1323.4
2017 7513 883.3 0.0 565.6
2018 4203 735.0 0.0 812.2
2019 2124 338.9 0.0 294.0

For data sources see[8]

Occurences

Occurence Date Occurence Type Occurence Depth (m) Occurence Control Depth (m)
2013-02-19 Lost Circulation 2621.00 4007.00
2013-03-19 No Incident N/A N/A

For data sources see[9]

References