Digital Petroleum Atlas
Round Mound North Field
General Information
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Digital Petroleum Atlas |
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| Round Mound North Field Oil & Gas Data | ||||
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General Field Information | |
| Geologic Province: | Central Kansas Uplift |
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| Exploration Method: | Subsurface geology complemented with a seismic survey |
| Surface Formation: | Niobrara (cretaceous) |
| Oldest Formation Penetrated: | Arbuckle Dolomite |
| Drilling Casing Practices: | Wells were drilled with rotary drilling equipment. The salt water disposal well was cased with 5 1/2" and the eight productive wells were cased with 4 1/2" through all potential pay zones. In the development of the field two wells penetrated the Arbuckle, two wells penetrated the Viola, six wells penetrated the Conglomerate section, four wells stopped in the Marmaton and one well stopped in the Pleasanton. All potential zones were drillstem tested in the discovery well, but in the development wells there was no further testing after the first positive drillstem test. Wells were generally completed by perforating all the zones believed to be productive and then attempting to selectively acidize each zone with at least 300 gallons of 28% mud acid using a bridge plug and packer. Five of the wells were given 20,000 to 25,000 gallon 28% acid jobs following zone communication problems. |
| Electric Logging Practices: | At total depth all producing wells were logged with a Radiation Guard Log. A Bore Hole Compensated Sonic Log was run only in the discovery well. |
| Comments: | Other Shows: As of 1985, all of the potential zones in the eight productive wells had been perforated. |
| Discussion: | The Round Mound North Field is a closed low relief anticlinal feature of Post-Mississippian Age located on the northeast flank of the Central Kansas Uplift. Axis of the structure appears to trend northwesterly as does the large Central Kansas Uplift on which it is located. Structural relief on the shallow Stone Corral anhydrite is as much or more than on the Heebner Shale. Closure on the Heebner Shale is 21 feet or more, 19 feet or more on the Base of the Lansing-Kansas City and over 38 feet on the Viola and Arbuckle. The Round Mound North Field was discovered by the completion of the Graham-Michaelis Corporation Schultz 1-27 in November, 1980. It was completed for 72 BOPD and 0 BWPD from the Toronto and Lansing-Kansas City "A","B","C-D","G","H","I"," J", and "K" Zones. It was drilled about 2 miles northwest of the Round Mound Field, which produced over 139,000 barrels of oil from 1967 - 1985 from 3 wells in the Lansing-Kansas City. Development continued in 1980 and 1981 with last producers, the Schultz 4-27 and Beisner 1-21 completed in September, 1981. Production performance of the Beisner 1-21 well has been poor and is apparently due to the fact that it is the lowest producer on the structure and has poor zone development. These were followed by seven dry holes, five by Graham-Michaelis Corporation, one by N-B Company and one by Gear Petroleum Company Inc. There are 10 productive Lansing-Kansas-City zones in addition to the Toronto; each zone, however, does not produce in every well. Based on a study of the open hole electric logs and limited drillstem test data, it is believed that the Lansing-Kansas City "B","C-D","G","H" and "I" Zones are probably the best zones. The Toronto and remaining Lansing-Kansas City zones are important only in some areas of the field. Based on the information available, the Toronto and Lansing-Kansas City reservoirs in this field appear to produce primarily by solution gas drive. Water production has averaged less than 100 BWPD for the total field and has now declined to 35 BWPD or less. |
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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| 12 MAR 1981 | SCHULTZE-CRAWFORD was SCHULTZE 1-27 7 | 
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No Gas Production | No Digital LAS Files | No Core Images | No Core Data |
| Well Location: | C NE NW 27-T9S-R15W |
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| Rotary Total Depth: | 3830 |
| Production Zone: | Lansing - Kansas City Supergroup |
| Initial Oil Potential: | Pumped 72 BOPD |
| Casing: | 8 5/8" @ 256' w/ 175 sx 4 1/2" @ 3829' w/ 200 sx |
| Perforations: | 3439-3442 Lansing 3404-3407 Lansing 3391-3395 Lansing 3362-3365 Lansing 3370-3372 Lansing 3375-3377 Lansing 3314-3317 Lansing 3326-3329 Lansing 3271-3275 Lansing 3252-3256 Lansing 3235-3239 Lansing 3196-3199 Toronto |
| Treatments: | 3500 gallons 28% acid |
| Comments: | Bottom hole pressures from the drillstem test covering the Toronto and different zones within the Lansing/Kansas City ranged from 780 psi to 1231 psi. Each of the five drillstem tests covered more than one zone. |
| Data Source: | KOGF, VOl. V; DISCOVERY 2897 |
| 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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| 11 NOV 1982 | SCHULTZE-CRAWFORD was SCHULTZ 3-27 5 |
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No Gas Production | No Digital LAS Files | No Core Images | No Core Data |
| Well Location: | NW NW NW 27-T9S-R15W |
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| Rotary Total Depth: | 3550 |
| Production Zone: | SHAWNEE OIL |
| Data Source: | DISCOVERY 9308 |
Summary Production Information | |
| Field Size: | 480 acres |
| Total Wells: | 21 |
| Productive Oil Wells: | 15 as of October 2024 |
| Abandoned Wells: | 8 |
| Cumulative Oil: | 704,402.63 bbls as of October 2024 |
Producing Formation:SHAWNEE |
| Depth Top: | 3189 feet |
| Geological Age: | Pennsylvanian |
| Depositional Environment: | Mississippian and Maquoketa rocks are absent by removal as a result of uplift and erosion prior to the Pennsylvanian sedimentation. A Conglomerate section that includes chert, shale and sand was deposited on a pre-Pennsylvanian Viola surface of Ordovician Age. Limestone and shale of the Marmaton and Pleasanton Groups overlie this Pennsylvanian Conglomerate section. Alternating limestone and shale of the Lansing-Kansas City were deposited in sequence above the Pleasanton Group. Douglas Shale and the Toronto Limestone and Heebner Shale of the Shawnee Group overlie the Lansing-Kansas City. |
| Formation Lithology: | The Toronto is a 14 foot bed of white to cream and light tan fine crystalline, fossiliferous, cherty and slightly chalky limestone with poor to fair inter-crystalline and pin point to vugular porosity. This porosity is found in most of the wells just above a 2 foot shaley interval in the lower portion of the Toronto. |
| Formation Geometry: | The Toronto and Lansing-Kansas City section of the Pennsylvanian age has a gross thickness of 296 feet in the Round Mound North Field. They are composed of alternate beds of Limestone and Shale. The Toronto top is about 20 feet below the Heebner Shale and 30 feet above the Lansing "A" Zone top. The 3 to 4 foot Heebner Black Shale is probably the most distinctive datum in the Pennsylvanian System. From the structure map using this datum, it can be seen that the field produces from a low relief structural trap with almost all of the production occurring from wells that encounter the Heebner above -1155 subsea. |
| Trap Type: | Structural |
SHAWNEE (Shawnee Group) |
| Thickness: | 28 feet |
SHAWNEE (Shawnee Group) |
| Produces Oil: | Yes |
| Maximum Net Pay: | 4 feet | Average Net Pay: | 2 feet |
| Average Oil Column: | 12 | Average Gas Column: | 0 |
| Oil Water Contact: | Some water was produced with the oil but no oil-water datum was established. It is possible to recover water on drill stem tests in wells that encounter the Heebner Shale below -1155 subsea. |
| Drive Mechanism: | Solution gas drive |
| Initial Pressure: | 1005 | Data Source of Initial Pressure: | KOGF, Vol. V: avg from DST rpt of 780 to 1231 psi |
| Pressure Maintenance or EOR: | In 1985, a water flood feasibility study of the Toronto and Lansing-Kansas City reservoirs was planned. | Estimated Ultimate Recovery: | 600000 |
| Estimated Primary Oil Recovery: | 400000 | Estimated Ultimate Recovery: | 600000 |
| Proven Production: | 100 acres | Production Well Spacing: | 10 acres |
SHAWNEE (Shawnee Group) |
| Oil Color: | Light brown % |
| Oil Type: | Sweet % |
| Minimum Oil API Gravity: | 36 | Maximum Oil API Gravity: | 38 % |
SHAWNEE (Shawnee Group) |
| Total Solids: | 93000 ppm | Resistivity: | .06 |
| Chloride Equivalent: | 55400 ppm | Barium: | 0 ppm |
| Bicarbonates: | 0 ppm | Calcium: | 0 ppm |
| Calcium Bicarbonate: | 0 ppm | Calcium Sulfate: | 0 ppm |
| Iron: | 0 | Magnesium: | 0 ppm |
| Magnesium Sulfate: | 0 ppm | Silica: | 0 |
| Sodium Sulfate: | 0 ppm | Sodium Chloride: | 0 ppm |
| Strontium: | 0 | Sulfates: | 0 ppm |
SHAWNEE (Shawnee Group) |
| Porosity Type: | Inter-crystalline, Inter-fossiliferous, pinpoint to vugular and oolicastic | Maximum Porosity: | 17 % | Average Porosity: | 14 % |
Producing Formation:LANSING-KANSAS CITY |
| Depth Top: | 3169 feet |
| Geological Age: | Pennsylvanian |
| Depositional Environment: | Mississippian and Maquoketa rocks are absent by removal as a result of uplift and erosion prior to the Pennsylvanian sedimentation. A Conglomerate section that includes chert, shale and sand was deposited on a pre-Pennsylvanian Viola surface of Ordovician Age. Limestone and shale of the Marmaton and Pleasanton Groups overlie this Pennsylvanian Conglomerate section. Alternating limestone and shale of the Lansing-Kansas City were deposited in sequence above the Pleasanton Group. Douglas Shale and the Toronto Limestone and Heebner Shale of the Shawnee Group overlie the Lansing-Kansas City. |
| Formation Lithology: | The Toronto is a 14 foot bed of white to cream and light tan fine crystalline, fossiliferous, cherty and slightly chalky limestone with poor to fair inter-crystalline and pin point to vugular porosity. This porosity is found in most of the wells just above a 2 foot shaley interval in the lower portion of the Toronto. |
| Formation Geometry: | The Toronto and Lansing-Kansas City section of the Pennsylvanian age has a gross thickness of 296 feet in the Round Mound North Field. They are composed of alternate beds of Limestone and Shale. The Toronto top is about 20 feet below the Heebner Shale and 30 feet above the Lansing "A" Zone top. The 3 to 4 foot Heebner Black Shale is probably the most distinctive datum in the Pennsylvanian System. From the structure map using this datum, it can be seen that the field produces from a low relief structural trap with almost all of the production occurring from wells that encounter the Heebner above -1155 subsea. |
| Trap Type: | Structural |
LANSING-KANSAS CITY (Lansing - Kansas City Supergroup) |
| Thickness: | 273 feet |
LANSING-KANSAS CITY (Lansing - Kansas City Supergroup) |
| Produces Oil: | Yes |
| Maximum Net Pay: | 10 feet | Average Net Pay: | 4 feet |
| Average Oil Column: | 12 | Average Gas Column: | 0 |
| Oil Water Contact: | Some water was produced with the oil but no oil-water datum was established. It is possible to recover water on drill stem tests in wells that encounter the Heebner Shale below -1155 subsea. |
| Drive Mechanism: | Solution gas drive |
| Initial Pressure: | 1005 | Data Source of Initial Pressure: | KOGF, Vol. V: avg from DST rpt of 780 to 1231 psi |
| Pressure Maintenance or EOR: | In 1985, a water flood feasibility study of the Toronto and Lansing-Kansas City reservoirs was planned. | Estimated Ultimate Recovery: | 600000 |
| Estimated Primary Oil Recovery: | 400000 | Estimated Ultimate Recovery: | 600000 |
| Proven Production: | 100 acres | Production Well Spacing: | 10 acres |
LANSING-KANSAS CITY (Lansing - Kansas City Supergroup) |
| Oil Color: | Light brown % |
| Oil Type: | Sweet % |
| Minimum Oil API Gravity: | 36 | Maximum Oil API Gravity: | 38 % |
LANSING-KANSAS CITY (Lansing - Kansas City Supergroup) |
| Total Solids: | 93000 ppm | Resistivity: | .06 |
| Chloride Equivalent: | 55400 ppm | Barium: | 0 ppm |
| Bicarbonates: | 0 ppm | Calcium: | 0 ppm |
| Calcium Bicarbonate: | 0 ppm | Calcium Sulfate: | 0 ppm |
| Iron: | 0 | Magnesium: | 0 ppm |
| Magnesium Sulfate: | 0 ppm | Silica: | 0 |
| Sodium Sulfate: | 0 ppm | Sodium Chloride: | 0 ppm |
| Strontium: | 0 | Sulfates: | 0 ppm |
LANSING-KANSAS CITY (Lansing - Kansas City Supergroup) |
| Porosity Type: | Inter-crystalline, Inter-fossiliferous, pinpoint to vugular and oolicastic | Maximum Porosity: | 23 % | Average Porosity: | 12 % |
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