Digital Petroleum Atlas
Wellsford Field
General Information
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Digital Petroleum Atlas |
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| Wellsford Field Oil & Gas Data | |||
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General Field Information | |
| Geologic Province: | Northern Shelf Anadarko Basin |
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| Exploration Method: | Subsurface Mapping |
| Surface Formation: | Pleistocene Sandstone |
| Oldest Formation Penetrated: | Arbuckle, SE SE SE of 28S-16W-12 |
| Drilling Casing Practices: | The wells drilled in the mid-1950s were not fractured. A mud acid treatment provided sufficient stimulus to start production. Later, drilling practices varied with the operators in the areas. In 1985, the mud system used was generally a chemical system with good weight, chloride, viscosity and water loss controls. Drillstem tests are usually run to aid in pipe setting decisions. The Cherokee Sandstone can be depleted so pressure data is important. Completion varies with potential; in some wells a light clean up acid is all that is required, tighter wells require a fracture treatment. A foam fracture is often used to complete the Cherokee Sandstone. |
| Electric Logging Practices: | This also varies with the operation, simple logs to complete log suites have been run throughout the area. |
| Comments: | Base of Pennsylvanian gas analysis: Hydrogen Sulfide: 0% Carbon Dioxide: 0% Oxygen: 0.2% Nitrogen: 0.76% Methane: 93.02% Ethane: 3.55% Propane: 1.35% Iso-Butane: 0.23% N-Butane: 0.46% Iso-Pentane: 0.05% N-Pentane: 0.2% Hexanes and heavier: 0.38% BTU calculated: 1088 Specific Gravity calculated: 0.615 Other Shows: Shows have been encountered in the Lansing-Kansas City Groups and the Marmaton Group. In 1985, there was not any known production from these groups. |
| Discussion: | The Wellsford and Wellsford NE fields were combined for the purpose of this study. These fields are very closely related and appear to have no separation. This field is a complex stratgraphic-structural trap of Lower Pennsylvanian and Mississippian rocks. Production is very diverse depending upon permeability and porosity developments. Often the Mississippian chert has porosity development but the permeability is not developed and the hydrocarbons can not be moved from within the pore space. Permeability is often not developed within the Cherokee Sandstones due to clay or shale plugging. New production in this field is from the Conglomerate Chert and the Kinderhook Chert. This study touches briefly on the Conglomerate, but does not separate Kinderhook Sandstone and Chert production. |
Discovery Well(s) |
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| Discovery Date | Well Name | Available Well Data | Oil Production | Gas Production | LAS File Viewer with Core Data Plots | Core Image | Core Data Table |
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| 04 OCT 1955 | PYLE-HERRING 1 | 
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No Digital LAS Files | No Core Images | No Core Data |
| Well Location: | NW NW NE 15-T28S-R16W |
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| Rotary Total Depth: | 4819 |
| Production Zone: | |
| Initial Oil Potential: | 939 MMCF |
| Initial Formation Pressure: | 1588 |
| Casing: | 5" @ 4819' |
| Perforations: | 4680 - 4688 Base of Pennsylvanian |
| Treatments: | Acidized and well kicked off flowing |
| Data Source: | KOGF, Vols. I and V; DISCOVERY 2208 |
Summary Production Information | |
| Field Size: | 5120 acres |
| Total Wells: | 90 |
| Productive Oil Wells: | 31 as of July 2024 |
| Productive Gas Wells: | 9 as of May 2015 |
| Abandoned Wells: | 17 |
| Cumulative Oil: | 749,089.13 bbls as of July 2024 |
| Cumulative Gas: | 4,988,229.00 mcf as of May 2015 |
Producing Formation:CHEROKEE |
| Depth Top: | 4720 feet |
| Geological Age: | Pennsylvanian |
| Depositional Environment: | As a result of deposition of an encroaching sea, the sandstone filled the Mississippian erosional features (James, 1956). |
| Formation Lithology: | White to brown, fine to medium grained, well to poorly sorted, subangular to rounded quartz grains. Often micaceous and silty or shaley. |
| Formation Geometry: | Thin to medium thickness bodies of sandstone often associated with Cherokee Shale to Mississippian thicks. The sand is associated with the top of the Mississippian erosional top. |
| Trap Type: | Stratigraphic/Structural |
| Continuity of Reservoir Rocks: | The Pennsylvanian basal sandstone is generally a porous, medium to fine, well to rather poorly sorted, subangular sandstone, grading and thinning laterally to sandy shale. |
CHEROKEE (Cherokee Group) |
| Thickness: | 100 feet |
CHEROKEE (Cherokee Group) |
| Produces Oil: | Yes | Produces Gas: | Yes |
| Maximum Net Pay: | 12 feet | Average Net Pay: | 7 feet |
| Gas Oil Ratio: | Varies from well to well | Drive Mechanism: | Gas expansion or solution gas drive |
| Initial Pressure: | 1458 | Data Source of Initial Pressure: | KOGF, Vol. V |
CHEROKEE (Cherokee Group) |
| Minimum BTU: | 1016 | Maximum BTU: | 1088 |
| Nitrogen: | 10.54 % |
| Methane: | 79.71 % | Ethane: | 6.18 % |
| Propane: | 2.79 % |
CHEROKEE (Cherokee Group) |
| Oil Color: | Black / Dark green % |
| Oil Base: | 1.1% by weight % |
| Oil Pour Point: | -7 | Concentration of Sulphur: | 1.1 % |
CHEROKEE (Cherokee Group) |
| Porosity Type: | Intergranular | Maximum Porosity: | 32 % | Average Porosity: | 15 % |
CHEROKEE (Cherokee Group) |
| Maximum Horizontal: | 243 md |
Producing Formation:MISSISSIPPIAN |
| Depth Top: | 4729 feet |
| Geological Age: | Mississippian Osage |
| Depositional Environment: | A massive chert body deposited during the latest Mississippian time. This sequence is a residual chert deposited as a result of weathering. |
| Formation Lithology: | Osage chert, white, tan, occasionally yellow. Angular to slightly rounded chert. Severe weathering (tripolitic) and fracturing creates the porosity in the better wells. Conglomerate: Multi-colored chert, red, yellow, brown. Angular to rounded chert grains. Better reservoir rock is weathered and often fractured. Sometimes shaley. |
| Formation Geometry: | The Osage chert blankets this area and appears to be present in all wells in varying thickness. Conglomerate: Lenses of chert and weathered material associated with Mississippian erosional surface. Conglormerate production in this area is difficult to differentiate from "true" Mississippian. |
| Trap Type: | Stratigraphic/Structural The basal Pennsylvanian sand producing in the Wellsford discovery well overlies the Mississippian in most of the area of the Haviland and Wellsford fields, with probable communication to the Mississippian, thereby constituting essentially one reservoir in most or all of the immediate area. As seen on Mississippian structural and isopachous maps, this reservoir may be classified as a complex stratigraphic trap with structural relationships. As the first deposit of an encroaching sea, the Pennsylvanian basal sandstone tended to fill irregularities of the Mississippian land surface. Ultimately, the pinchout of this erratic sand body and changes in reservoir conditions in the Mississippian residuum will define the field. |
| Continuity of Reservoir Rocks: | The Mississippian section consists of a chert pebble breccia or conglomerate, with reservoir qualities dependent upon degree of fracturing and weathering, as well as the amount of clay shales forming the matrix. |
MISSISSIPPIAN (Mississippian System) |
| Produces Oil: | Yes | Produces Gas: | Yes |
| Maximum Net Pay: | 72 feet | Average Net Pay: | 28 feet |
| Drive Mechanism: | Solution gas or gas expansion |
| Initial Pressure: | 1458 | Data Source of Initial Pressure: | KOGF, Vol. V |
MISSISSIPPIAN (Mississippian System) |
| Minimum BTU: | 1088 | Maximum BTU: | 1016 |
MISSISSIPPIAN (Mississippian System) |
| Oil Color: | Dark green % |
| Oil Base: | Paraffin % |
| Average Oil API Gravity: | 35.5 |
| Oil Pour Point: | -7 |
MISSISSIPPIAN (Mississippian System) |
| Porosity Type: | Fracture and Tripolitic (weathered) some vuggy | Maximum Porosity: | 25 % | Average Porosity: | 10 % |
MISSISSIPPIAN (Mississippian System) |
| Average Horizontal: | 17 md |
Producing Formation:KINDERHOOKIAN |
| Geological Age: | Mississippian Kinderhookian |
| Depositional Environment: | This sandstone appears to be well sorted bar or beach type deposits. They are often lense-like with porosity development. |
| Formation Lithology: | Fine grained, brown, white or tan well rounded and well sorted quartz sand grains. Often well cemented and quartzitic in nature. |
| Formation Geometry: | Deposition of the sandstone appears to be bar or beach type in nature but the cleaniness of the sand varys and is often very shaley. |
| Trap Type: | Stratigraphic/Structural |
KINDERHOOKIAN (Kinderhookian Stage) |
| Produces Oil: | Yes |
| Maximum Net Pay: | 18 feet | Average Net Pay: | 11.6 feet |
| Drive Mechanism: | Solution gas drive |
| Initial Pressure: | 1450 | Data Source of Initial Pressure: | KOGF, Vol. V |
KINDERHOOKIAN (Kinderhookian Stage) |
| Average Oil API Gravity: | 36 |
KINDERHOOKIAN (Kinderhookian Stage) |
| Porosity Type: | Intergranular | Maximum Porosity: | 24 % | Average Porosity: | 15.5 % |
Producing Formation:WABAUNSEE |
WABAUNSEE (Wabaunsee Group) |
| Produces Gas: | Yes |
Producing Formation:MARMATON |
| Depth Top: | 4680 feet |
MARMATON (Marmaton Group) |
| Produces Gas: | Yes |
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