The Quseir Formation consists mainly of dark gray mudstones with a high organic matter content and excellent hydrocarbon-generating potential.The main objectives of this study are to highlight the dominant structural ...The Quseir Formation consists mainly of dark gray mudstones with a high organic matter content and excellent hydrocarbon-generating potential.The main objectives of this study are to highlight the dominant structural elements in the Komombo Basin,Egypt,and evaluate the geochemical characteristics of the Quseir Formation.Depth maps and a 3 D structural model indicate two normal fault trends NW–SE and ENE–WSW.The NW–SE trend is the dominant one that created the primary half-graben system.The depth to the top of the Quseir Formation gradually decreases from the eastern and central parts towards the corners of the basin.The thickness of the Quseir Formation ranges from about 300 to 1000 ft.The 3 D facies model shows that the shale has a large probability distribution in the study area,compared with the sandstone and siltstone.The source rock potential varies between good in the western part to very good in the eastern part of the basin.The organic-rich interval is dominated by gas-prone kerogen type III based on TOC and Rock-Eval.The pyrolysis data vitrinite reflectance(%Ro)(0.5–0.74%)and Tmax values(406–454 C°)suggest a maturity level that ranges from immature to early maturity stage for hydrocarbon generation.展开更多
The petroliferous province of the Western Desert comprises several sedimentary basins with different hydrocarbon potentiality and production capability.The middle Jurassic Khatatba Formation was proved a potential sou...The petroliferous province of the Western Desert comprises several sedimentary basins with different hydrocarbon potentiality and production capability.The middle Jurassic Khatatba Formation was proved a potential source rock in some basins and active/effective in others.The current study aims to give a comprehensive assessment and evaluation of the potential organic-rich intervals of the Khatatba Formation across JG and JD fields,northeast Abu Gharadig Basin(NEAG).The hydrocarbon generating capability and sourcing of the Khatatba Formation studied through organic geochemistry calibrated with well logging.However,the efficiency of some widely used plots of geochemistry is re-evaluated according to their accuracy and consistency.Forty cuttings,thirteen cores and two oil samples obtained from three wells(JG-2,JG-3 and JD-4)were evaluated.The samples revealed total organic carbon(TOC)values ranging from 1 to 9 wt%,exhibiting a good-excellent potential source rock.A single sample in the JD-4 well attained a TOC value of 21.3 wt%with a generating potential(represented by S2 parameter)exceeding 146 mgHc/g rock required a special evaluation.Most of the samples(mainly in the JD-4 well)attained a sufficient level of thermal maturity for hydrocarbon generation with a Tmax up to 449C.The vitrinite reflectance(%Ro)values(a common maturity-related indicator)acquired from the JD-4 well ranging between 0.76%and 0.92%.These values are tediously increasing with depth indicating a uniform geothermal regime.The Khatatba organofacies,with wide variety of kerogen types(I,II,II-S and II/III),contain marine organic matter with a slight terrigenous input,exhibiting anoxic-suboxic environmental conditions.Oil-source correlations define the organic-rich intervals responsible for charging the accumulated hydrocarbon in the NEAG concession.展开更多
文摘The Quseir Formation consists mainly of dark gray mudstones with a high organic matter content and excellent hydrocarbon-generating potential.The main objectives of this study are to highlight the dominant structural elements in the Komombo Basin,Egypt,and evaluate the geochemical characteristics of the Quseir Formation.Depth maps and a 3 D structural model indicate two normal fault trends NW–SE and ENE–WSW.The NW–SE trend is the dominant one that created the primary half-graben system.The depth to the top of the Quseir Formation gradually decreases from the eastern and central parts towards the corners of the basin.The thickness of the Quseir Formation ranges from about 300 to 1000 ft.The 3 D facies model shows that the shale has a large probability distribution in the study area,compared with the sandstone and siltstone.The source rock potential varies between good in the western part to very good in the eastern part of the basin.The organic-rich interval is dominated by gas-prone kerogen type III based on TOC and Rock-Eval.The pyrolysis data vitrinite reflectance(%Ro)(0.5–0.74%)and Tmax values(406–454 C°)suggest a maturity level that ranges from immature to early maturity stage for hydrocarbon generation.
文摘The petroliferous province of the Western Desert comprises several sedimentary basins with different hydrocarbon potentiality and production capability.The middle Jurassic Khatatba Formation was proved a potential source rock in some basins and active/effective in others.The current study aims to give a comprehensive assessment and evaluation of the potential organic-rich intervals of the Khatatba Formation across JG and JD fields,northeast Abu Gharadig Basin(NEAG).The hydrocarbon generating capability and sourcing of the Khatatba Formation studied through organic geochemistry calibrated with well logging.However,the efficiency of some widely used plots of geochemistry is re-evaluated according to their accuracy and consistency.Forty cuttings,thirteen cores and two oil samples obtained from three wells(JG-2,JG-3 and JD-4)were evaluated.The samples revealed total organic carbon(TOC)values ranging from 1 to 9 wt%,exhibiting a good-excellent potential source rock.A single sample in the JD-4 well attained a TOC value of 21.3 wt%with a generating potential(represented by S2 parameter)exceeding 146 mgHc/g rock required a special evaluation.Most of the samples(mainly in the JD-4 well)attained a sufficient level of thermal maturity for hydrocarbon generation with a Tmax up to 449C.The vitrinite reflectance(%Ro)values(a common maturity-related indicator)acquired from the JD-4 well ranging between 0.76%and 0.92%.These values are tediously increasing with depth indicating a uniform geothermal regime.The Khatatba organofacies,with wide variety of kerogen types(I,II,II-S and II/III),contain marine organic matter with a slight terrigenous input,exhibiting anoxic-suboxic environmental conditions.Oil-source correlations define the organic-rich intervals responsible for charging the accumulated hydrocarbon in the NEAG concession.
