The Experts below are selected from a list of 159 Experts worldwide ranked by ideXlab platform
Yi Wu - One of the best experts on this subject based on the ideXlab platform.
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orbital cyclostratigraphy of the devonian frasnian famennian transition in south china
Palaeogeography Palaeoclimatology Palaeoecology, 2001Co-Authors: Yiming Gong, Baohua Li, Chengyuan Wang, Yi WuAbstract:Abstract Superbundlesets, bundlesets, bundles and laminae were formed in the carbonate successions of the Devonian Frasnian–Famennian transition in Guangxi, South China. Their hierarchical structures, ratio relationships and arrangement order within conodont zones are lasting and stable in the stratigraphical sequences, and can be traced across the different facies belts and sedimentary basins. The hierarchically organized superbundlesets, bundlesets, bundles and laminae correspond to a long eccentricity, eccentricity, obliquity and precession and sub-Milankovitch cyclothem, respectively. The ratio of long eccentricity to eccentricity is 1:4 below the boundary between Frasnian–Famennian and 1:3 above the boundary between Frasnian–Famennian, eccentricity to obliquity is 1:3, and eccentricity to precession is 1:6 in the Devonian. Since the eccentricity periodicity of 100,000 years remains essentially steady through geological time, the periodicity of the long eccentricity, obliquity, precession and sub-Milankovitch Cycle was 400,000, 33,333, 16,667 and 8000 or 17,000 years. These ratios are different from those of the Permian, Cretaceous and Quaternary, and coincide well with those calculated theoretically by Berger et al. Science, 255 (1992) 560. This reinforces the hypothesis of the slowing of the earth's rotation and the lengthening of precession and obliquity periods since at least the Devonian time. On the basis of the hierarchical Milankovitch cyclothems, the chronostratigraphical subdivision and correlation of the Frasnian–Famennian transition can be made at the resolution of 100,000s and 10,000s of years. The duration of the upper rhenana Zone, linguiformis Zone, and lower, middle and upper triangularis Zone is 0.6, 0.8, 0.3, 0.3 and 0.3 Ma, respectively.
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Orbital cyclostratigraphy of the Devonian Frasnian–Famennian transition in South China
Palaeogeography Palaeoclimatology Palaeoecology, 2001Co-Authors: Yiming Gong, Baohua Li, Chengyuan Wang, Yi WuAbstract:Abstract Superbundlesets, bundlesets, bundles and laminae were formed in the carbonate successions of the Devonian Frasnian–Famennian transition in Guangxi, South China. Their hierarchical structures, ratio relationships and arrangement order within conodont zones are lasting and stable in the stratigraphical sequences, and can be traced across the different facies belts and sedimentary basins. The hierarchically organized superbundlesets, bundlesets, bundles and laminae correspond to a long eccentricity, eccentricity, obliquity and precession and sub-Milankovitch cyclothem, respectively. The ratio of long eccentricity to eccentricity is 1:4 below the boundary between Frasnian–Famennian and 1:3 above the boundary between Frasnian–Famennian, eccentricity to obliquity is 1:3, and eccentricity to precession is 1:6 in the Devonian. Since the eccentricity periodicity of 100,000 years remains essentially steady through geological time, the periodicity of the long eccentricity, obliquity, precession and sub-Milankovitch Cycle was 400,000, 33,333, 16,667 and 8000 or 17,000 years. These ratios are different from those of the Permian, Cretaceous and Quaternary, and coincide well with those calculated theoretically by Berger et al. Science, 255 (1992) 560. This reinforces the hypothesis of the slowing of the earth's rotation and the lengthening of precession and obliquity periods since at least the Devonian time. On the basis of the hierarchical Milankovitch cyclothems, the chronostratigraphical subdivision and correlation of the Frasnian–Famennian transition can be made at the resolution of 100,000s and 10,000s of years. The duration of the upper rhenana Zone, linguiformis Zone, and lower, middle and upper triangularis Zone is 0.6, 0.8, 0.3, 0.3 and 0.3 Ma, respectively.
Yunfeng Bai - One of the best experts on this subject based on the ideXlab platform.
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petrological characteristics and shale oil enrichment of lacustrine fine grained sedimentary system a case study of organic rich shale in first member of cretaceous qingshankou formation in gulong sag songliao basin ne china
Petroleum Exploration and Development, 2018Co-Authors: Bo Liu, Jiaxin Shi, F U Xiaofei, Yanfang Lyu, Xianda Sun, Lei Gong, Yunfeng BaiAbstract:Abstract Taking organic-rich shale in the first member of Cretaceous Qingshankou Formation in the Gulong Sag, northern Songliao Basin as an example, this study examined the lithofacies classification, petrological characteristics, pore size distribution and their implications on the enrichment of shale oil of lacustrine detrital fine-grained shale. The spatial variation of lithofacies, controlled by Milankovitch Cycle and influenced by sediment provenance, has an obvious sequence. The fine-grained sedimentary rocks of studied section could be classified into seven lithofacies according to a three-step classification criterion that consists of total organic carbon (TOC), sedimentary structure and mineral composition. Among them, the laminated siliceous mudstone lithofacies with moderate TOC has high hydrocarbon generation potential and abundant reservoir space, making it the most favorable lithofacies for the enrichment of matrix shale oil. Under the background of abnormally high pressure, the laminated siliceous mudstone lithofacies with moderate TOC deposited between the top of SSC2 and the bottom of SSC3 is stable in lateral distribution in the delta-lacustrine transition zone, with continuous thickness greater than 30 m. The massive siliceous mudstone lithofacies with high and moderate TOC developed in the middle of the these two Cycles can act as the roof and floor seal for shale oil, therefore, the study area has good conditions for forming matrix type shale oil reservoirs.
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Petrological characteristics and shale oil enrichment of lacustrine fine-grained sedimentary system: A case study of organic-rich shale in first member of Cretaceous Qingshankou Formation in Gulong Sag, Songliao Basin, NE China
KeAi Communications Co. Ltd., 2018Co-Authors: Bo Liu, Jiaxin Shi, Yanfang Lyu, Xianda Sun, Lei Gong, Yunfeng BaiAbstract:Taking organic-rich shale in the first member of Cretaceous Qingshankou Formation in the Gulong Sag, northern Songliao Basin as an example, this study examined the lithofacies classification, petrological characteristics, pore size distribution and their implications on the enrichment of shale oil of lacustrine detrital fine-grained shale. The spatial variation of lithofacies, controlled by Milankovitch Cycle and influenced by sediment provenance, has an obvious sequence. The fine-grained sedimentary rocks of studied section could be classified into seven lithofacies according to a three-step classification criterion that consists of total organic carbon (TOC), sedimentary structure and mineral composition. Among them, the laminated siliceous mudstone lithofacies with moderate TOC has high hydrocarbon generation potential and abundant reservoir space, making it the most favorable lithofacies for the enrichment of matrix shale oil. Under the background of abnormally high pressure, the laminated siliceous mudstone lithofacies with moderate TOC deposited between the top of SSC2 and the bottom of SSC3 is stable in lateral distribution in the delta-lacustrine transition zone, with continuous thickness greater than 30 m. The massive siliceous mudstone lithofacies with high and moderate TOC developed in the middle of the these two Cycles can act as the roof and floor seal for shale oil, therefore, the study area has good conditions for forming matrix type shale oil reservoirs. Key words: Songliao Basin, Gulong Sag, Cretaceous, Qingshankou Formation, Milankovitch Cycle, shale lithofacies, shale oi
Bo Liu - One of the best experts on this subject based on the ideXlab platform.
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petrological characteristics and shale oil enrichment of lacustrine fine grained sedimentary system a case study of organic rich shale in first member of cretaceous qingshankou formation in gulong sag songliao basin ne china
Petroleum Exploration and Development, 2018Co-Authors: Bo Liu, Jiaxin Shi, F U Xiaofei, Yanfang Lyu, Xianda Sun, Lei Gong, Yunfeng BaiAbstract:Abstract Taking organic-rich shale in the first member of Cretaceous Qingshankou Formation in the Gulong Sag, northern Songliao Basin as an example, this study examined the lithofacies classification, petrological characteristics, pore size distribution and their implications on the enrichment of shale oil of lacustrine detrital fine-grained shale. The spatial variation of lithofacies, controlled by Milankovitch Cycle and influenced by sediment provenance, has an obvious sequence. The fine-grained sedimentary rocks of studied section could be classified into seven lithofacies according to a three-step classification criterion that consists of total organic carbon (TOC), sedimentary structure and mineral composition. Among them, the laminated siliceous mudstone lithofacies with moderate TOC has high hydrocarbon generation potential and abundant reservoir space, making it the most favorable lithofacies for the enrichment of matrix shale oil. Under the background of abnormally high pressure, the laminated siliceous mudstone lithofacies with moderate TOC deposited between the top of SSC2 and the bottom of SSC3 is stable in lateral distribution in the delta-lacustrine transition zone, with continuous thickness greater than 30 m. The massive siliceous mudstone lithofacies with high and moderate TOC developed in the middle of the these two Cycles can act as the roof and floor seal for shale oil, therefore, the study area has good conditions for forming matrix type shale oil reservoirs.
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Petrological characteristics and shale oil enrichment of lacustrine fine-grained sedimentary system: A case study of organic-rich shale in first member of Cretaceous Qingshankou Formation in Gulong Sag, Songliao Basin, NE China
KeAi Communications Co. Ltd., 2018Co-Authors: Bo Liu, Jiaxin Shi, Yanfang Lyu, Xianda Sun, Lei Gong, Yunfeng BaiAbstract:Taking organic-rich shale in the first member of Cretaceous Qingshankou Formation in the Gulong Sag, northern Songliao Basin as an example, this study examined the lithofacies classification, petrological characteristics, pore size distribution and their implications on the enrichment of shale oil of lacustrine detrital fine-grained shale. The spatial variation of lithofacies, controlled by Milankovitch Cycle and influenced by sediment provenance, has an obvious sequence. The fine-grained sedimentary rocks of studied section could be classified into seven lithofacies according to a three-step classification criterion that consists of total organic carbon (TOC), sedimentary structure and mineral composition. Among them, the laminated siliceous mudstone lithofacies with moderate TOC has high hydrocarbon generation potential and abundant reservoir space, making it the most favorable lithofacies for the enrichment of matrix shale oil. Under the background of abnormally high pressure, the laminated siliceous mudstone lithofacies with moderate TOC deposited between the top of SSC2 and the bottom of SSC3 is stable in lateral distribution in the delta-lacustrine transition zone, with continuous thickness greater than 30 m. The massive siliceous mudstone lithofacies with high and moderate TOC developed in the middle of the these two Cycles can act as the roof and floor seal for shale oil, therefore, the study area has good conditions for forming matrix type shale oil reservoirs. Key words: Songliao Basin, Gulong Sag, Cretaceous, Qingshankou Formation, Milankovitch Cycle, shale lithofacies, shale oi
Chengshan Wang - One of the best experts on this subject based on the ideXlab platform.
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astrochronology of the early turonian early campanian terrestrial succession in the songliao basin northeastern china and its implication for long period behavior of the solar system
Palaeogeography Palaeoclimatology Palaeoecology, 2013Co-Authors: Shihong Zhang, Ganqing Jiang, Linda A Hinnov, Tianshui Yang, Xiaoqiao Wan, Chengshan WangAbstract:Abstract The first complete Early Turonian–Early Campanian lacustrine succession has been recovered from the SK-I south (SK-Is) borehole in the Songliao Basin (SLB), northeastern China. We conducted a detailed cyclostratigraphic study of natural gamma-ray (GR) log, thorium (Th) log, and magnetic susceptibility (MS) data from this core. Spectral analysis of the upper Quantou Formation (K 2 q 3 + 4 ), Qingshankou Formation (K 2 qn), Yaojia Formation (K 2 y), and lower Nenjiang Formation (K 2 n 1 + 2 ) reveals a hierarchy of meter- to decameter-scale cycling in the data. The wavelength ratios of the Cycles in these stratigraphic units are ~ 20:5:2:1, corresponding with those of Milankovitch Cycle periods of 405 kyr (long eccentricity):100 kyr (short eccentricity):37 kyr (obliquity):20 kyr (precession), indicating astronomical control on sedimentation. An astronomical time scale (ATS) was established by tuning interpreted 405 kyr Cycles to a 405 kyr orbital eccentricity target curve, and to four SIMS U–Pb zircon radioisotope ages. This ‘absolute’ ATS provides precise numerical ages for stratigraphic boundaries, biozones, geological and geophysical events, and serves as a basis for correlation of strata and events between marine and terrestrial systems. The ages of the C33r/C34n geomagnetic polarity boundary in K 2 n 2 and three short reversal events in K 2 y are estimated as 83.633 Ma, 84.819–84.862 Ma, 84.982–85.092 Ma and 85.240–85.629 Ma, respectively. Long-period amplitude modulations in the obliquity and eccentricity bands of the 405-kyr-tuned GR-Th series provide strong evidence that long-period orbital forcing influenced climate change and depositional processes in the SLB. The extracted amplitude modulations provide evidence that the orbits of Earth and Mars were not in secular resonance, and were undergoing chaotic interactions during this time, although the modulations do not match those of recent astronomical models.
Yiming Gong - One of the best experts on this subject based on the ideXlab platform.
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orbital cyclostratigraphy of the devonian frasnian famennian transition in south china
Palaeogeography Palaeoclimatology Palaeoecology, 2001Co-Authors: Yiming Gong, Baohua Li, Chengyuan Wang, Yi WuAbstract:Abstract Superbundlesets, bundlesets, bundles and laminae were formed in the carbonate successions of the Devonian Frasnian–Famennian transition in Guangxi, South China. Their hierarchical structures, ratio relationships and arrangement order within conodont zones are lasting and stable in the stratigraphical sequences, and can be traced across the different facies belts and sedimentary basins. The hierarchically organized superbundlesets, bundlesets, bundles and laminae correspond to a long eccentricity, eccentricity, obliquity and precession and sub-Milankovitch cyclothem, respectively. The ratio of long eccentricity to eccentricity is 1:4 below the boundary between Frasnian–Famennian and 1:3 above the boundary between Frasnian–Famennian, eccentricity to obliquity is 1:3, and eccentricity to precession is 1:6 in the Devonian. Since the eccentricity periodicity of 100,000 years remains essentially steady through geological time, the periodicity of the long eccentricity, obliquity, precession and sub-Milankovitch Cycle was 400,000, 33,333, 16,667 and 8000 or 17,000 years. These ratios are different from those of the Permian, Cretaceous and Quaternary, and coincide well with those calculated theoretically by Berger et al. Science, 255 (1992) 560. This reinforces the hypothesis of the slowing of the earth's rotation and the lengthening of precession and obliquity periods since at least the Devonian time. On the basis of the hierarchical Milankovitch cyclothems, the chronostratigraphical subdivision and correlation of the Frasnian–Famennian transition can be made at the resolution of 100,000s and 10,000s of years. The duration of the upper rhenana Zone, linguiformis Zone, and lower, middle and upper triangularis Zone is 0.6, 0.8, 0.3, 0.3 and 0.3 Ma, respectively.
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Orbital cyclostratigraphy of the Devonian Frasnian–Famennian transition in South China
Palaeogeography Palaeoclimatology Palaeoecology, 2001Co-Authors: Yiming Gong, Baohua Li, Chengyuan Wang, Yi WuAbstract:Abstract Superbundlesets, bundlesets, bundles and laminae were formed in the carbonate successions of the Devonian Frasnian–Famennian transition in Guangxi, South China. Their hierarchical structures, ratio relationships and arrangement order within conodont zones are lasting and stable in the stratigraphical sequences, and can be traced across the different facies belts and sedimentary basins. The hierarchically organized superbundlesets, bundlesets, bundles and laminae correspond to a long eccentricity, eccentricity, obliquity and precession and sub-Milankovitch cyclothem, respectively. The ratio of long eccentricity to eccentricity is 1:4 below the boundary between Frasnian–Famennian and 1:3 above the boundary between Frasnian–Famennian, eccentricity to obliquity is 1:3, and eccentricity to precession is 1:6 in the Devonian. Since the eccentricity periodicity of 100,000 years remains essentially steady through geological time, the periodicity of the long eccentricity, obliquity, precession and sub-Milankovitch Cycle was 400,000, 33,333, 16,667 and 8000 or 17,000 years. These ratios are different from those of the Permian, Cretaceous and Quaternary, and coincide well with those calculated theoretically by Berger et al. Science, 255 (1992) 560. This reinforces the hypothesis of the slowing of the earth's rotation and the lengthening of precession and obliquity periods since at least the Devonian time. On the basis of the hierarchical Milankovitch cyclothems, the chronostratigraphical subdivision and correlation of the Frasnian–Famennian transition can be made at the resolution of 100,000s and 10,000s of years. The duration of the upper rhenana Zone, linguiformis Zone, and lower, middle and upper triangularis Zone is 0.6, 0.8, 0.3, 0.3 and 0.3 Ma, respectively.