Organic matter accumulation in the Upper Cretaceous Qingshankou and Nenjiang Formations, Songliao Basin (NE China): Implications from high-resolution geochemical analysis
The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bo...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Xu, Jinjun [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2019transfer abstract |
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| Schlagwörter: |
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| Umfang: |
15 |
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| Übergeordnetes Werk: |
Enthalten in: Honesty-Humility and unethical behavior in adolescents: The mediating role of moral disengagement and the moderating role of system justification - Guo, Zhen ELSEVIER, 2021, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:102 ; year:2019 ; pages:187-201 ; extent:15 |
| Links: |
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| DOI / URN: |
10.1016/j.marpetgeo.2018.12.037 |
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ELV046138676 |
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| 245 | 1 | 0 | |a Organic matter accumulation in the Upper Cretaceous Qingshankou and Nenjiang Formations, Songliao Basin (NE China): Implications from high-resolution geochemical analysis |
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| 520 | |a The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. | ||
| 520 | |a The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. | ||
| 650 | 7 | |a Organic petrography |2 Elsevier | |
| 650 | 7 | |a Biomarker |2 Elsevier | |
| 650 | 7 | |a Inorganic geochemistry |2 Elsevier | |
| 650 | 7 | |a Organic matter accumulation |2 Elsevier | |
| 650 | 7 | |a Songliao basin |2 Elsevier | |
| 700 | 1 | |a Liu, Zhaojun |4 oth | |
| 700 | 1 | |a Bechtel, Achim |4 oth | |
| 700 | 1 | |a Sachsenhofer, Reinhard F. |4 oth | |
| 700 | 1 | |a Jia, Jianliang |4 oth | |
| 700 | 1 | |a Meng, Qingtao |4 oth | |
| 700 | 1 | |a Sun, Pingchang |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier Science |a Guo, Zhen ELSEVIER |t Honesty-Humility and unethical behavior in adolescents: The mediating role of moral disengagement and the moderating role of system justification |d 2021 |g Amsterdam [u.a.] |w (DE-627)ELV006295584 |
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10.1016/j.marpetgeo.2018.12.037 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000848.pica (DE-627)ELV046138676 (ELSEVIER)S0264-8172(18)30568-3 DE-627 ger DE-627 rakwb eng 610 VZ 44.67 bkl Xu, Jinjun verfasserin aut Organic matter accumulation in the Upper Cretaceous Qingshankou and Nenjiang Formations, Songliao Basin (NE China): Implications from high-resolution geochemical analysis 2019transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. Organic petrography Elsevier Biomarker Elsevier Inorganic geochemistry Elsevier Organic matter accumulation Elsevier Songliao basin Elsevier Liu, Zhaojun oth Bechtel, Achim oth Sachsenhofer, Reinhard F. oth Jia, Jianliang oth Meng, Qingtao oth Sun, Pingchang oth Enthalten in Elsevier Science Guo, Zhen ELSEVIER Honesty-Humility and unethical behavior in adolescents: The mediating role of moral disengagement and the moderating role of system justification 2021 Amsterdam [u.a.] (DE-627)ELV006295584 volume:102 year:2019 pages:187-201 extent:15 https://doi.org/10.1016/j.marpetgeo.2018.12.037 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 44.67 Kinderheilkunde VZ AR 102 2019 187-201 15 |
| spelling |
10.1016/j.marpetgeo.2018.12.037 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000848.pica (DE-627)ELV046138676 (ELSEVIER)S0264-8172(18)30568-3 DE-627 ger DE-627 rakwb eng 610 VZ 44.67 bkl Xu, Jinjun verfasserin aut Organic matter accumulation in the Upper Cretaceous Qingshankou and Nenjiang Formations, Songliao Basin (NE China): Implications from high-resolution geochemical analysis 2019transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. Organic petrography Elsevier Biomarker Elsevier Inorganic geochemistry Elsevier Organic matter accumulation Elsevier Songliao basin Elsevier Liu, Zhaojun oth Bechtel, Achim oth Sachsenhofer, Reinhard F. oth Jia, Jianliang oth Meng, Qingtao oth Sun, Pingchang oth Enthalten in Elsevier Science Guo, Zhen ELSEVIER Honesty-Humility and unethical behavior in adolescents: The mediating role of moral disengagement and the moderating role of system justification 2021 Amsterdam [u.a.] (DE-627)ELV006295584 volume:102 year:2019 pages:187-201 extent:15 https://doi.org/10.1016/j.marpetgeo.2018.12.037 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 44.67 Kinderheilkunde VZ AR 102 2019 187-201 15 |
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10.1016/j.marpetgeo.2018.12.037 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000848.pica (DE-627)ELV046138676 (ELSEVIER)S0264-8172(18)30568-3 DE-627 ger DE-627 rakwb eng 610 VZ 44.67 bkl Xu, Jinjun verfasserin aut Organic matter accumulation in the Upper Cretaceous Qingshankou and Nenjiang Formations, Songliao Basin (NE China): Implications from high-resolution geochemical analysis 2019transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. Organic petrography Elsevier Biomarker Elsevier Inorganic geochemistry Elsevier Organic matter accumulation Elsevier Songliao basin Elsevier Liu, Zhaojun oth Bechtel, Achim oth Sachsenhofer, Reinhard F. oth Jia, Jianliang oth Meng, Qingtao oth Sun, Pingchang oth Enthalten in Elsevier Science Guo, Zhen ELSEVIER Honesty-Humility and unethical behavior in adolescents: The mediating role of moral disengagement and the moderating role of system justification 2021 Amsterdam [u.a.] (DE-627)ELV006295584 volume:102 year:2019 pages:187-201 extent:15 https://doi.org/10.1016/j.marpetgeo.2018.12.037 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 44.67 Kinderheilkunde VZ AR 102 2019 187-201 15 |
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10.1016/j.marpetgeo.2018.12.037 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000848.pica (DE-627)ELV046138676 (ELSEVIER)S0264-8172(18)30568-3 DE-627 ger DE-627 rakwb eng 610 VZ 44.67 bkl Xu, Jinjun verfasserin aut Organic matter accumulation in the Upper Cretaceous Qingshankou and Nenjiang Formations, Songliao Basin (NE China): Implications from high-resolution geochemical analysis 2019transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. Organic petrography Elsevier Biomarker Elsevier Inorganic geochemistry Elsevier Organic matter accumulation Elsevier Songliao basin Elsevier Liu, Zhaojun oth Bechtel, Achim oth Sachsenhofer, Reinhard F. oth Jia, Jianliang oth Meng, Qingtao oth Sun, Pingchang oth Enthalten in Elsevier Science Guo, Zhen ELSEVIER Honesty-Humility and unethical behavior in adolescents: The mediating role of moral disengagement and the moderating role of system justification 2021 Amsterdam [u.a.] (DE-627)ELV006295584 volume:102 year:2019 pages:187-201 extent:15 https://doi.org/10.1016/j.marpetgeo.2018.12.037 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 44.67 Kinderheilkunde VZ AR 102 2019 187-201 15 |
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10.1016/j.marpetgeo.2018.12.037 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000000848.pica (DE-627)ELV046138676 (ELSEVIER)S0264-8172(18)30568-3 DE-627 ger DE-627 rakwb eng 610 VZ 44.67 bkl Xu, Jinjun verfasserin aut Organic matter accumulation in the Upper Cretaceous Qingshankou and Nenjiang Formations, Songliao Basin (NE China): Implications from high-resolution geochemical analysis 2019transfer abstract 15 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. Organic petrography Elsevier Biomarker Elsevier Inorganic geochemistry Elsevier Organic matter accumulation Elsevier Songliao basin Elsevier Liu, Zhaojun oth Bechtel, Achim oth Sachsenhofer, Reinhard F. oth Jia, Jianliang oth Meng, Qingtao oth Sun, Pingchang oth Enthalten in Elsevier Science Guo, Zhen ELSEVIER Honesty-Humility and unethical behavior in adolescents: The mediating role of moral disengagement and the moderating role of system justification 2021 Amsterdam [u.a.] (DE-627)ELV006295584 volume:102 year:2019 pages:187-201 extent:15 https://doi.org/10.1016/j.marpetgeo.2018.12.037 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U 44.67 Kinderheilkunde VZ AR 102 2019 187-201 15 |
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organic matter accumulation in the upper cretaceous qingshankou and nenjiang formations, songliao basin (ne china): implications from high-resolution geochemical analysis |
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Organic matter accumulation in the Upper Cretaceous Qingshankou and Nenjiang Formations, Songliao Basin (NE China): Implications from high-resolution geochemical analysis |
| abstract |
The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. |
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The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. |
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The Songliao Basin is well-known as one of most prolific petroleum basins in China. Information regarding Upper Cretaceous organic matter (OM) accumulation within black shales of the Qingshankou and Nenjiang Formations (Fm) can be obtained by geochemical analyses. Two oil shale successions at the bottom of the Qingshankou Fm first member (K2qn1) and Nenjiang Fm second member (K2n2) are investigated in high resolution to reveal the factors that govern OM accumulation. Within the two target profiles, combined petrological and geochemical results indicate that OM accumulation can be divided into two phases: (i) a lower phase characterized by high primary productivity, enhanced input of terrigenous OM and anaerobic conditions of OM deposition (TOC maximum 18.25 wt%) and (ii) an upper phase of lower primary productivity and anoxic to dysoxic conditions in bottom water (TOC maximum 9.45 wt%). Alternations of warmer and wetter climatic conditions provided the nutrients, and fluctuations in lake level are suggested to be responsible for differences in redox conditions and bioproductivity between the two phases. Marine ingressions enhanced OM preservation by promoting bottom water salinity (e.g., anaerobic conditions with brackish-saline water within K2qn1 lower phase). The identification of different OM accumulation mechanisms by high-resolution geochemical analyses are expected to improve the prediction of high quality source rocks within uniform depositional environments. |
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