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• W1997593941 abstract "Abstract A surface microseismic array was utilized to perform hydraulic fracture diagnostics during stimulation of the Chevron Skinner Ridge (SR) #698–22–1 well, Williams Fork Formation (Late Cretaceous), Garfield County, western Piceance Basin, western Colorado. Production from very low permeability Williams Fork gas sandstones requires fracture stimulation to enhance wellbore-to-reservoir connectivity. The use of surface microseismic monitors without borehole equipment in downhole configurations represents a relatively new and untested technology for hydraulic fracture diagnostics. Analysis of the surface microseismic data was carried out for five (5) hydraulic fracture stages to:determine the applicability of the surface microseismic approach in the absence of an offset observation well; andcharacterize fracture height, azimuth, length and symmetry with respect to rock properties. Hydraulic fracture stimulations to date at SR have encompassed limited entry waterfrac treatment techniques. The hydraulic fracture characteristics were interpreted to document possible influences that natural fractures, horizontal stress trends and sandstone channel orientations may have had on hydraulic fracture emplacement. The Williams Fork Formation at SR contains natural fractures, and the primary open natural fracture sets strike generally east-west. Healed natural fracture sets strike generally northwest-southeast. The current principal horizontal stress trends are roughly east-west. The fluvial Williams Fork sandstone bodies have highly variable orientations due to meandering and braided stream depositional origins, but many channels trend roughly east-west and northwest-southeast. The SR #22–1 well is located in a deep and relatively narrow (1–2 mi wide) north-northwest-south-southeast trending valley roughly 2,000 ft below the adjacent mesa tops, which is an important geomechanical consideration. The surface microseismic data were of sufficient quality to enable successful interpretations of hydraulic fracture geometries. The hydraulic fracture stimulations were emplaced progressively uphole between 5,298 to 3,372 ft measured depth. The deeper stages grew mainly along east-west and northwest-southeast orientations, and the upper stages formed largely along northwest-southeast orientations. All stages showed asymmetric geometry. The lower stages may have been influenced by the northwest-southeast sandstone body and healed natural fracture orientations, along with east-west sandstone body, primary open natural fracture and horizontal stress directions. The upper stages may have been more influenced by the northwest-southeast sandstone body and healed natural fracture orientations, and topographic effects. Additionally, during some stimulation treatments, shallower stages appeared to be in vertical communication with previous deeper stages. A possible tectonic fault that had not been mapped due to widely spaced well control may have further influenced hydraulic fracture growth in one stage. Introduction / Purpose of Study The purpose of this paper is to present a case study of a passive surface emission tomography (PSET®) microseismic experiment conducted in a well in the Williams Fork Formation, Piceance Basin, western Colorado. The Williams Fork is widely recognized as a classic Western Interior USA low permeability (tight) gas sandstone (TGS) play, and is being actively developed by a host of major and independent companies. Chevron amassed approximately 100,000 acres of fee land over many years at Skinner Ridge (SR) in Garfield County, centered roughly 15 mi northwest of Debeque, at the time for the vast oil shale resource potential. The TGS potential at SR has been known since the late 1980's, partly as a result of tests of the coal gas potential in six (6) wells in the Cameo coal zones at the base of the Williams Fork Formation. A combination of recent price, technology, and portfolio drivers resulted in a 14-well Williams Fork delineation program at SR in summer 2005 through summer 2006. The delineation well production rates, decline curve profiles and estimated ultimate recoveries (EUR's) satisfied economic hurdles, and planning for full field development starting in mid-2007 was authorized." @default.
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• W1997593941 date "2007-04-16" @default.
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• W1997593941 title "Hydraulic Fracture Diagnostics In The Williams Fork Formation, Piceance Basin, Colorado Using Surface Microseismic Monitoring Technology" @default.
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• W1997593941 doi "https://doi.org/10.2118/108142-ms" @default.
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