A wildcat may not result in a petroleum prospect; however, it may indicate potential need for frontier explo- ration, since petroleum could leak into economic accumu- lations. Carbazoles and benzocarbazoles are nitrog...A wildcat may not result in a petroleum prospect; however, it may indicate potential need for frontier explo- ration, since petroleum could leak into economic accumu- lations. Carbazoles and benzocarbazoles are nitrogen compounds in petroleum and can be employed to explicitly explain migration direction and distance of leaking petro- leum. The hypothesis of this study is that the mechanism of the reaction involving the attraction of carbazoles to clay minerals on the matrix of the walls along their migration pathways determines the isomer that is preferentially attached to the mineral matrix. The objectives of this study are （a） to produce a profile for carbazoles and benzocar- bazoles ratios in the cap rock overlying the reservoir, （b） to compare carbazole and benzocarbazole ratios to 20S/ （20S ＋ 20R） （^（^C29 Sterane maturity ratios （c） to infer migration direction from the carbazoles and benzocar- bazoles ratio. Samples used were side wall cores and drill cuttings of water-based mud drilling. The EOM （ex- tractable organic matter） from various formations overlying the reservoir was obtained using Soxtherm Automatic Equipment. The TPH （total petroleum hydrocarbon） was obtained from the EOM by using a precleaned isolute C18 500 mg / 3 mL column, eluted with hexane, while the polars were eluted with dichloromethane. Fractionation into satu- rates and aromatics was done using a silver nitrate-silica gel column. The profiles of 1,8/1,3 and 1,8/2,4 dimethyl car- bazoles and the benzocarbazoles ratios show a vertical gra- dient of decreasing ratio with increasing vertical distance from the reservoir. This corroborates the %VRo equivalent of 20S/（20S ＋ 20R） αααC29 Sterane and the carbazole ratios infer vertical migration of leaked petroleum.展开更多
The phenomena of geochemical migration during the formation of the Karamay Oil Field have been revealed by correlating the compositions of non-hydrocarbon, asphaltene, steranes and terpanes from between oils and rocks...The phenomena of geochemical migration during the formation of the Karamay Oil Field have been revealed by correlating the compositions of non-hydrocarbon, asphaltene, steranes and terpanes from between oils and rocks. The study on abnormal compaction observed in a deep well, which is located between the source area and the oil field, and the corresponding depletion of hydrocarbons further clarifies the conditions of the migration of oil and gas. Results show that the necessary condition for the formation of this giant oil field is a long distance of lateral migration of oil and gas followed by a redistribution along Ka.-Ur. large fault before accumulation in a large uplift.展开更多
文摘A wildcat may not result in a petroleum prospect; however, it may indicate potential need for frontier explo- ration, since petroleum could leak into economic accumu- lations. Carbazoles and benzocarbazoles are nitrogen compounds in petroleum and can be employed to explicitly explain migration direction and distance of leaking petro- leum. The hypothesis of this study is that the mechanism of the reaction involving the attraction of carbazoles to clay minerals on the matrix of the walls along their migration pathways determines the isomer that is preferentially attached to the mineral matrix. The objectives of this study are （a） to produce a profile for carbazoles and benzocar- bazoles ratios in the cap rock overlying the reservoir, （b） to compare carbazole and benzocarbazole ratios to 20S/ （20S ＋ 20R） （^（^C29 Sterane maturity ratios （c） to infer migration direction from the carbazoles and benzocar- bazoles ratio. Samples used were side wall cores and drill cuttings of water-based mud drilling. The EOM （ex- tractable organic matter） from various formations overlying the reservoir was obtained using Soxtherm Automatic Equipment. The TPH （total petroleum hydrocarbon） was obtained from the EOM by using a precleaned isolute C18 500 mg / 3 mL column, eluted with hexane, while the polars were eluted with dichloromethane. Fractionation into satu- rates and aromatics was done using a silver nitrate-silica gel column. The profiles of 1,8/1,3 and 1,8/2,4 dimethyl car- bazoles and the benzocarbazoles ratios show a vertical gra- dient of decreasing ratio with increasing vertical distance from the reservoir. This corroborates the %VRo equivalent of 20S/（20S ＋ 20R） αααC29 Sterane and the carbazole ratios infer vertical migration of leaked petroleum.
文摘The phenomena of geochemical migration during the formation of the Karamay Oil Field have been revealed by correlating the compositions of non-hydrocarbon, asphaltene, steranes and terpanes from between oils and rocks. The study on abnormal compaction observed in a deep well, which is located between the source area and the oil field, and the corresponding depletion of hydrocarbons further clarifies the conditions of the migration of oil and gas. Results show that the necessary condition for the formation of this giant oil field is a long distance of lateral migration of oil and gas followed by a redistribution along Ka.-Ur. large fault before accumulation in a large uplift.
