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• W2009675012 abstract "Abstract A near-surface soil-gas geochemical survey was executed in conjunction with the Phase II experiment at the North Knobs, Wyoming, GR and DC-DOE UCG facility from July 22, 1981, through December 12, 1981. The soil-gas detection method offers a unique new technique for locating potential gas leakage areas before any significant migration avenues can develop. This approach has the advantage over atmospheric measurements because the soil gases are not greatly affected by winds and other varying meteorological conditions; therefore a much lower level anomaly may be resolved. One hundred and twenty-two, 18 foot deep permanent sites, based upon the local geology, permanent sites, based upon the local geology, were located and installed over the areas of both the previous Phase I and the current Phase II retorts. All sites were routinely monitored for methane, ethane, propane, i-butane, n-butane, ethylene, propylene, helium, hydrogen, carbon dioxide and carbon monoxide. Selected sites were periodically monitored for carbon disulphide, periodically monitored for carbon disulphide, carbonyl sulphide, hydrogen sulphide and sulphur dioxide. The survey demonstrates that residual gases from the Phase I burn are still present in the near surface and product gases generated during the Phase II burn were clearly evident. Maps are presented showing the areal distribution of these presented showing the areal distribution of these products during: (1) the preburn, prepressure products during:(1)the preburn, prepressure period;(2)the air-pressured interval during period;(2)the air-pressured interval during system checkout;(3)the ignition and early burn period; and(4)the late-burn and early post-burn period; and(4)the late-burn and early post-burn interval. These maps and the tabulated data indicate a recognizable surface response occurred 3–6 days after changes in the burn retort pressures. Product gases migrated into the near Product gases migrated into the near surface both vertically and laterally along well developed cross-joints and near-strike joint sets within the sandstones stratigraphically above the coal seam being burned. Additional leakage is probably associated with poor cementing of the probably associated with poor cementing of the casing in some of the deep boreholes. Casing leakage explains most of those anomalies located in the rock sequence stratigraphically below the coal. While throughout the survey abnormally high values were found in the near surface at many geochemical sites, ambient air samples routinely taken near those sites consistently had low values. It is concluded that a properly designed and operated UCG facility would not experience any adverse product gas leakage and would pose no hazard problems from either a safety or environmental point of view. Introduction The North Knobs UCG facility is located approximately eight miles west of Rawlins, Wyoming, in south-central Wyoming (Figure 1). It is situated on the southwest flank of the asymmetrical Rawlins uplift adjacent to the Washakie Basin. Throughout the area, the well exposed resistant sandstones all exhibit a remarkably consistent and well developed near-rectalinear joint pattern. The dominant (systematic) joint set strikes about 6 (N14W) from the strike of the beds (N20W) and is well exposed throughout the area. A well developed, but subordinate, non-systematic cross-joint set having a strike of approximately N49E is also present in all exposures. Figure 2, modified from McCurdy, schematically illustrates the rectalinear joint system and proposes a mechanism for possible migration, to the surface, of leaked gas from the coal burn." @default.
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• W2009675012 date "1982-09-26" @default.
• W2009675012 modified "2023-09-30" @default.
• W2009675012 title "Surface Detection of Retort Gases From an Underground Coal Gasification Reactor in Steeply Dipping Beds Near Rawlins, Wyoming" @default.
• W2009675012 doi "https://doi.org/10.2118/11050-ms" @default.
• W2009675012 hasPublicationYear "1982" @default.
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