General Field Information |
| Produces Oil: Yes Produces Gas: No |
| Geologic Province: |
Central Kansas Uplift |
| Exploration Method: |
Subsurface |
| Surface Formation: |
Niobrara |
| Oldest Formation Penetrated: |
Weathered Granite |
| Drilling Casing Practices: |
Due to the Dakota water, surface casing is set in the anhydrite. Good mud practices are maintained while drilling in the Arbuckle-Dolomite to prevent lost circulation. Approximately 57% of the wells are open hole completed with little or no acid. Wells perforated are completed naturally or with stimulation as needed. |
| Electric Logging Practices: |
Gamma Ray-Neutron, Guard & Caliper were run on most of the wells. A few fracture finder logs run. Cement bond logs run before perforating. |
| Comments: |
Other Shows: Topeka - Limestone, light tan, crystalline, fossiliferous, scattered pinpoint porosity.
Marmaton Sand - clear, medium grained, good intercrystalline porosity. |
| Discussion: |
The discovery well for the Riffe Field was the Rim Oil Co. Riffe 1, SE NE NW, Sec. 30-7s-7w, drilled in April 1978 and was based on a subsurface play. The well was a marginal Toronto producer. The Arbuckle discovery well was drilled in July 1979 and was also a marginal producer. Both wells were structurally high but tight. The first good Arbuckle producer was drilled in December 1980 in the NW NW NE, Sec. 30-7s-7w finding porous Dolomite, over 2 1/2 years after the first well was drilled. This well started the rapid development that was to continue until 1984. The field is essentially Arbuckle production with 10 Lansing and 3 Toronto wells. Three Arbuckle wells have been twinned for Lansing production. One Arbuckle well has been plugged back for Lansing production.
Riffe Field trends NW-SE with the production in the south, west, and northwest being mostly controlled by a porosity pinchout. In the east half of section 19, the net pay ranges up to 60' with a majority of the wells being open hole completions. Lost circulation zones, are present all though the Arbuckle section. Two wells had such severe problems that cement plugs had to be spotted before production casing could be run. One well cable tooled through the plug and established production for a short time. The Lansing "G" zone exhibits its maximum thickness in the east half of section 19 also. The porosity thins to the south and pinches out to the northwest. Arbuckle "sinkholes" are present in and on the flanks of the field. There is some evidence for a NW SE trending fault east of the Riffe that may separate this area from the Wordston Anticline. The Riffe Field would be on the downthrown side of the fault. The Arbuckle is higher on the Wordston Anticline but the structures along the trend contain water in the Arbuckle. |
|
| Depth Top: |
2937 feet |
| Geological Age: |
Pennsylvanian |
| Depositional Environment: |
The carbonates and shales of the Lansing were deposited on a broad shelf in a series of transgressive and regressive layers. The "G" zone in this area appears to have undergone more winowing, as this zone exhibits cleaner and thicker carbonate material in the central portion of the field than is present in the north and south. The north portion is thinnest and has the least porosity. |
| Formation Lithology: |
Limestone, light grey, oolicastic, fair intercrystalline porosity, Limestone, tan, crystalline, highly fossilifereous, good intercrystalline porosity |
| Trap Type: |
Structural - Stratigraphic |
| Depth Top: |
3235 feet |
| Geological Age: |
Lower Ordovician |
| Depositional Environment: |
The Arbuckle was deposited on the ancestral Central Kansas Uplift in thick beds of carbonate strata with relatively little shale and sand due to the area being relatively stable. Near the end of Mississippian time a major structural change took place. Because of prolonged erosion, some of the younger Ordovician strata was removed and the Arbuckle that remained exhibits the karst topography resulting in the porosity that makes excellent hydrocarbon reservoirs. |
| Formation Lithology: |
Dolomite, cream crystalline, no visible porosity, Dolomite, white, fine grained, good intercrystalline porosity. Dolomite, tan, medium to coarse grained, good intercrystalline porosity |
| Formation Geometry: |
Karst topography |
| Trap Type: |
Structural - Stratigraphic |
