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Surprise production from the Lansing Kansas City Formation Cimarex, Mendota Ranch wells, Hemphill County, Texas


The Mendota Ranch 41-1H well in Hemphill County, Texas was completed in the Pennsylvanian Lansing-Kansas City Formation at 8,900′ TVD. Logs showed five thin, organic-rich zones about 100 feet apart separated by tight, organic lean silica and carbonate. The well had an IP of 100 bopd of 41 API degree oil. The Mendota Ranch 12-1H well was drilled five miles SW of the Mendota Ranch 41-1H well and a conventional core was taken over most of the Lansing-Kansas City Formation. TOC in four organic rich zones ranged from about 4 to 13%, kerogen was type II, and the maturity was 0.9% Ro. Rock extracts correlated with the produced oil from the Mendota Ranch 41-1H well, indicating that the oil is indigenous and most likely originated primarily in the thin, organic rich zones. When the Mendota Ranch 12-1H lateral reached half of its designed length, the well began producing 240 bopd of 63 API condensate and 9,000 mcfgpd from the un-stimulated open hole. This condensate and gas were very similar to the 69 API degree condensate and gas produced from the Granite Wash in nearby wells. Biomarker analysis indicated the condensate is primarily from the Granite Wash and mixed with a minor amount of Mendota Ranch 41–1 Lansing-Kansas City crude oil, which is consistent with the open-hole completion. The lateral encountered a deep fracture zone through which condensate and gas migrated about 2,000′ vertically from Granite Wash reservoirs into the Lansing-Kansas City Formation.