− | In this case history, the client conducted a [[Surficial geochemistry and hydrocarbon detection methods|soil gas hydrocarbon survey]] along the [[trace]] of the [[seismic line]] to look for evidence of hydrocarbon [[Seepage activity and surficial geochemistry|microseepage]] from a seismically defined trap at [[commom depth point (CDP)]] 1070 ([[:file:surface-geochemical-exploration-for-petroleum_fig18-6.png|Figure 1]]). Propane soil gas anomalies were detected at CDP 1070 and 1096. The wildcat well drilled at CDP 1070 resulted in a new field discovery. The geochemical lead at CDP 1096 was reevaluated seismically. After additional processing, a revised interpretation (right) also predicted [[porosity]] development there and coincident with the surface geochemical anomaly. A second productive well was drilled at CDP 1096. | + | In this case history, the client conducted a [[Surficial geochemistry and hydrocarbon detection methods|soil gas hydrocarbon survey]] along the [[trace]] of the [[seismic line]] to look for evidence of hydrocarbon [[Macroseepage vs. microseepage in surficial geochemistry|microseepage]] from a seismically defined trap at [[commom depth point (CDP)]] 1070 ([[:file:surface-geochemical-exploration-for-petroleum_fig18-6.png|Figure 1]]). Propane soil gas anomalies were detected at CDP 1070 and 1096. The [[wildcat]] well drilled at CDP 1070 resulted in a new field discovery. The geochemical lead at CDP 1096 was reevaluated seismically. After additional [[Seismic processing basics|processing]], a revised interpretation (right) also predicted [[porosity]] development there and coincident with the surface geochemical anomaly. A second productive well was drilled at CDP 1096. |
| [[file:surface-geochemical-exploration-for-petroleum_fig18-6.png|300px|thumb|{{figure number|1}}seismic section and soil gas profile of a stratigraphic trap located at approximately 5,600 ft (1.5 sec) in the Cretaceous Escondido Sandstone in La Salle County, Texas. Modified. Copyright: Rice, 1989<ref name=Rice_1989>Rice, G., 1989, Exploration Enhancement by integrating near-surface geochemical and seismic methods: Oil & Gas Journal, v. 87, no. 14 (April 3), p. 66-71.</ref>; courtesy Oil & Gas Journal.]] | | [[file:surface-geochemical-exploration-for-petroleum_fig18-6.png|300px|thumb|{{figure number|1}}seismic section and soil gas profile of a stratigraphic trap located at approximately 5,600 ft (1.5 sec) in the Cretaceous Escondido Sandstone in La Salle County, Texas. Modified. Copyright: Rice, 1989<ref name=Rice_1989>Rice, G., 1989, Exploration Enhancement by integrating near-surface geochemical and seismic methods: Oil & Gas Journal, v. 87, no. 14 (April 3), p. 66-71.</ref>; courtesy Oil & Gas Journal.]] |
| [[:file:surface-geochemical-exploration-for-petroleum_fig18-6.png|Figure 1]] is a seismic section and soil gas profile of a stratigraphic trap located at approximately [[depth::5,600 ft]] (1.5 sec) in the Cretaceous Escondido Sandstone in La Salle County, Texas. | | [[:file:surface-geochemical-exploration-for-petroleum_fig18-6.png|Figure 1]] is a seismic section and soil gas profile of a stratigraphic trap located at approximately [[depth::5,600 ft]] (1.5 sec) in the Cretaceous Escondido Sandstone in La Salle County, Texas. |