The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform
Yanbin Yao - One of the best experts on this subject based on the ideXlab platform.
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geological and hydrological controls on the accumulation of coalbed methane within the no 3 coal seam of the southern qinshui basin
International Journal of Coal Geology, 2017Co-Authors: Junyan Zhang, Yanbin Yao, Dameng Liu, Yidong Cai, Zhejun Pan, Yingjin WangAbstract:Abstract Since 2006, the Zhengzhuang (ZZ) block has been part of a commercial coalbed methane (CBM) production area in the southern Qinshui Basin, which has become one of the most productive CBM areas in China. However, hydrogeological study of the migration gas and groundwater of the ZZ block has not been systematically launched. This study focuses on geochemical analysis, including quality analysis and stable isotope analyses for the water from the CBM production wells, discusses the groundwater flow pathways and their influencing factors, and evaluates the geological and hydrological controls on gas accumulation in the study area. The results show that the produced waters produced with total dissolved solids (TDS) values of 152.8–5389.49 mg/L are typically fresh water and brackish water. The water type is primarily bicarbonate and the dissolved ions are effectively devoid of sulfate, calcium and magnesium. With the low desulfurization coefficients of 0.24–5.63, the hydrochemical condition is conductive to CBM preservation. The predominant flow of groundwater originates from the southwestern source, which flows to the north basin center and then shifts to the east deep graben due to the drastic structural variation. Four Hydrodynamic zones were distinguished through the differences in Hydrodynamic conditions. In the southwest Zone I and the central Zone II, the gas contents are relatively low (13.17–24.53 m3/t) despite the high thermal maturity (Ro,max = 3.31%–3.97%). However, the stagnant Zone III in the north and the deep stagnant Zone IV in the southeast show comparatively high gas content (16.5–31.44 m3/t). The complex geostructures act synergistically with the intense Hydrodynamic activities for gas accumulation. Three CBM enrichment modes were distinguished: Hydrodynamic Trapping at structure lows with high hydrostatic pressure; conventional trap of impermeable boundary; and hydraulic flushing and gas loss through the fault. These investigations may serve for CBM exploration and development in the study area.
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preliminary evaluation of gas content of the no 2 coal seam in the yanchuannan area southeast ordos basin china
Journal of Petroleum Science and Engineering, 2014Co-Authors: Yidong Cai, Yanbin Yao, Dameng Liu, Keming Zhang, Derek Elsworth, Dazhen TangAbstract:Abstract Gas contents are highly variable in coalbed methane (CBM) reservoirs of the Yanchuannan (YCN) area of the southeast (SE) Ordos Basin, China. We used diverse geologic data derived from more than five years of exploration to provide insight into the origin of this variability and the consequences of gas content on reservoir performance. Major factors affecting gas content variability include gas generation, migration, Trapping and preservation. Gas generation affects gas content variability on the scale of the total resource, whereas gas migration influences the inhomogeneous redistribution of gas content on a regional or local scale. Gas Trapping and preservation affect the “as-observed” content. The potential for high gas content is controlled directly by the composite result of gas generation, migration, Trapping and preservation. CBM in the YCN area is produced from the relatively thick seam (~2.09 m and 8.05 m, with an average of 5.97 m) that is distributed through 450–1200 m of the stratigraphic section. Gas content tends to be structurally and Hydrodynamically controlled in the order of simple structure (folds and small faults)>complex structure (large regional faults) and groundwater stagnant zones>runoff zones. Coal samples in the YCN area typically have Langmuir volumes between 31.86 and 46.51 cm3/g, which correlates with coal rank. Reservoir heterogeneity including coal composition, pore structure and matrix moisture content may contribute to the heterogeneous gas content. Gas content is generally high where Hydrodynamic Trapping of gases occurs and may be anomalously low in areas of active recharge with downward flow potential and/or convergent flow where there is no mechanism for entrapment. In the YCN area, the most favorable area for CBM exploration and development is in the center block (block B), where great coal thickness, moderate burial depth, favorable Hydrodynamics and an anticlinal trap coincide to yield high gas contents.
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variable gas content saturation and accumulation characteristics of weibei coalbed methane pilot production field in the southeastern ordos basin china
AAPG Bulletin, 2013Co-Authors: Yanbin Yao, Dameng Liu, Yongkai QiuAbstract:Using diverse geologic and geophysical data from recent exploration and development, and experimental results of analysis of gas content, gas capacity, and gas composition, this article discusses how geologic, structural, and hydrological factors determine the heterogeneous distribution of gas in the Weibei coalbed methane (CBM) field. The coal rank of the Pennsylvanian no. 5 coal seam is mainly low-volatile bituminous and semianthracite. The total gas content is 2.69 to 16.15 m3/t (95.00–570.33 scf/t), and gas saturation is 26.0% to 93.2%. Burial coalification followed by tectonically driven hydrothermal activity controls not only thermal maturity, but also the quality and quantity of thermogenic gas generated from the coal. Gas composition indicates that the CBM is dry and of dominantly thermogenic origin. The thermogenic gases have been altered by fractionation that may be related to subsurface water movement in the southern part of the study area. Three gas accumulation models are identified: (1) gas diffusion and long-distance migration of thermogenic gases to no-flow boundaries for sorption and minor conventional Trapping, (2) Hydrodynamic Trapping of gas in structural lows, and (3) gas loss by Hydrodynamic flushing. The first two models are applicable for the formation of two CBM enrichment areas in blocks B3 and B4, whereas the last model explains extremely low gas content and gas saturation in block B5. The variable gas content, saturation, and accumulation characteristics are mainly controlled by these gas accumulation models.
Dameng Liu - One of the best experts on this subject based on the ideXlab platform.
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geological and hydrological controls on the accumulation of coalbed methane within the no 3 coal seam of the southern qinshui basin
International Journal of Coal Geology, 2017Co-Authors: Junyan Zhang, Yanbin Yao, Dameng Liu, Yidong Cai, Zhejun Pan, Yingjin WangAbstract:Abstract Since 2006, the Zhengzhuang (ZZ) block has been part of a commercial coalbed methane (CBM) production area in the southern Qinshui Basin, which has become one of the most productive CBM areas in China. However, hydrogeological study of the migration gas and groundwater of the ZZ block has not been systematically launched. This study focuses on geochemical analysis, including quality analysis and stable isotope analyses for the water from the CBM production wells, discusses the groundwater flow pathways and their influencing factors, and evaluates the geological and hydrological controls on gas accumulation in the study area. The results show that the produced waters produced with total dissolved solids (TDS) values of 152.8–5389.49 mg/L are typically fresh water and brackish water. The water type is primarily bicarbonate and the dissolved ions are effectively devoid of sulfate, calcium and magnesium. With the low desulfurization coefficients of 0.24–5.63, the hydrochemical condition is conductive to CBM preservation. The predominant flow of groundwater originates from the southwestern source, which flows to the north basin center and then shifts to the east deep graben due to the drastic structural variation. Four Hydrodynamic zones were distinguished through the differences in Hydrodynamic conditions. In the southwest Zone I and the central Zone II, the gas contents are relatively low (13.17–24.53 m3/t) despite the high thermal maturity (Ro,max = 3.31%–3.97%). However, the stagnant Zone III in the north and the deep stagnant Zone IV in the southeast show comparatively high gas content (16.5–31.44 m3/t). The complex geostructures act synergistically with the intense Hydrodynamic activities for gas accumulation. Three CBM enrichment modes were distinguished: Hydrodynamic Trapping at structure lows with high hydrostatic pressure; conventional trap of impermeable boundary; and hydraulic flushing and gas loss through the fault. These investigations may serve for CBM exploration and development in the study area.
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preliminary evaluation of gas content of the no 2 coal seam in the yanchuannan area southeast ordos basin china
Journal of Petroleum Science and Engineering, 2014Co-Authors: Yidong Cai, Yanbin Yao, Dameng Liu, Keming Zhang, Derek Elsworth, Dazhen TangAbstract:Abstract Gas contents are highly variable in coalbed methane (CBM) reservoirs of the Yanchuannan (YCN) area of the southeast (SE) Ordos Basin, China. We used diverse geologic data derived from more than five years of exploration to provide insight into the origin of this variability and the consequences of gas content on reservoir performance. Major factors affecting gas content variability include gas generation, migration, Trapping and preservation. Gas generation affects gas content variability on the scale of the total resource, whereas gas migration influences the inhomogeneous redistribution of gas content on a regional or local scale. Gas Trapping and preservation affect the “as-observed” content. The potential for high gas content is controlled directly by the composite result of gas generation, migration, Trapping and preservation. CBM in the YCN area is produced from the relatively thick seam (~2.09 m and 8.05 m, with an average of 5.97 m) that is distributed through 450–1200 m of the stratigraphic section. Gas content tends to be structurally and Hydrodynamically controlled in the order of simple structure (folds and small faults)>complex structure (large regional faults) and groundwater stagnant zones>runoff zones. Coal samples in the YCN area typically have Langmuir volumes between 31.86 and 46.51 cm3/g, which correlates with coal rank. Reservoir heterogeneity including coal composition, pore structure and matrix moisture content may contribute to the heterogeneous gas content. Gas content is generally high where Hydrodynamic Trapping of gases occurs and may be anomalously low in areas of active recharge with downward flow potential and/or convergent flow where there is no mechanism for entrapment. In the YCN area, the most favorable area for CBM exploration and development is in the center block (block B), where great coal thickness, moderate burial depth, favorable Hydrodynamics and an anticlinal trap coincide to yield high gas contents.
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variable gas content saturation and accumulation characteristics of weibei coalbed methane pilot production field in the southeastern ordos basin china
AAPG Bulletin, 2013Co-Authors: Yanbin Yao, Dameng Liu, Yongkai QiuAbstract:Using diverse geologic and geophysical data from recent exploration and development, and experimental results of analysis of gas content, gas capacity, and gas composition, this article discusses how geologic, structural, and hydrological factors determine the heterogeneous distribution of gas in the Weibei coalbed methane (CBM) field. The coal rank of the Pennsylvanian no. 5 coal seam is mainly low-volatile bituminous and semianthracite. The total gas content is 2.69 to 16.15 m3/t (95.00–570.33 scf/t), and gas saturation is 26.0% to 93.2%. Burial coalification followed by tectonically driven hydrothermal activity controls not only thermal maturity, but also the quality and quantity of thermogenic gas generated from the coal. Gas composition indicates that the CBM is dry and of dominantly thermogenic origin. The thermogenic gases have been altered by fractionation that may be related to subsurface water movement in the southern part of the study area. Three gas accumulation models are identified: (1) gas diffusion and long-distance migration of thermogenic gases to no-flow boundaries for sorption and minor conventional Trapping, (2) Hydrodynamic Trapping of gas in structural lows, and (3) gas loss by Hydrodynamic flushing. The first two models are applicable for the formation of two CBM enrichment areas in blocks B3 and B4, whereas the last model explains extremely low gas content and gas saturation in block B5. The variable gas content, saturation, and accumulation characteristics are mainly controlled by these gas accumulation models.
William D Demis - One of the best experts on this subject based on the ideXlab platform.
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Hydrodynamic Trapping in mission canyon formation mississippian reservoirs elkhorn ranch field north dakota
AAPG Bulletin, 1991Co-Authors: William D DemisAbstract:Hydrocarbons in Mission Canyon dolomite reservoirs in the Elkhorn Ranch field are trapped by downdip flow of formation water to the northeast. Elkhorn Ranch field is located on a north-plunging anticline with only 10 ft (3 m) of crestal closure. The Mission Canyon is a regressive, shallowing upward sequence of subtidal dolomitized mudstones and wackestones grading upward into sebkha-salina evaporites. Mission Canyon oil production is localized on the north and northeast side of the structure. Maps of porosity pinch-outs and permeability barriers defined from core data, superimposed upon the Mission Canyon structure, show that most of the oil cannot be trapped by stratigraphic facies change. Southwest-trending, updip porosity pinch-outs cross the north-plunging structural axis at an angle so low that hydrocarbons would leak out to the southwest under hydrostatic conditions. Downdip Hydrodynamic flow to the northeast provides the critical Trapping component. Regional maps of apparent formation water resistivity and water salinity show a region of fresher water south and southwest of the field. A regional potentiometric map constructed using Horner-plot extrapolated shut-in pressure data indicates a head gradient of about 20 ft/mi (4 m/km) to the northeast at Elkhorn Ranch field. This gradient corresponds to a calculated water-oil tilt ofmore » about 50 ft/mi (20 m/km). Observed tilt of the oil accumulation is actually about 25 ft/mi (5 m/km) to the northeast. This discrepancy might be the result of the field having not yet reached equilibrium with the invading water.« less
Wesley P Wong - One of the best experts on this subject based on the ideXlab platform.
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stretching dna to twice the normal length with single molecule Hydrodynamic Trapping
Lab on a Chip, 2020Co-Authors: Yan Jiang, Theodore Feldman, Julia A M Bakx, Darren Yang, Wesley P WongAbstract:Single-molecule force spectroscopy has brought many new insights into nanoscale biology, from the functioning of molecular motors to the mechanical response of soft materials within the cell. To expand the single-molecule toolbox, we have developed a surface-free force spectroscopy assay based on a high-speed Hydrodynamic trap capable of applying extremely high tensions for long periods of time. High-speed single-molecule Trapping is enabled by a rigid and gas-impermeable microfluidic chip, rapidly and inexpensively fabricated out of glass, double-sided tape and UV-curable adhesive. Our approach does not require difficult covalent attachment chemistries, and enables simultaneous force application and single-molecule fluorescence. Using this approach, we have induced a highly extended state with twice the contour length of B-DNA in regions of partially intercalated double-stranded (dsDNA) by applying forces up to 250 pN. This highly extended state resembles the hyperstretched state of dsDNA, which was initially discovered as a structure fully intercalated by dyes under high tension. It has been hypothesized that hyperstretched DNA could also be induced without the aid of intercalators if high-enough forces were applied, which matches our observation. Combining force application with single-molecule fluorescence imaging is critical for distinguishing hyperstretched DNA from single-stranded DNA that can result from peeling. High-speed Hydrodynamic Trapping is a powerful yet accessible force spectroscopy method that enables the mechanics of biomolecules to be probed in previously difficult to access regimes.
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stretching dna to twice the normal length with single molecule Hydrodynamic Trapping
bioRxiv, 2019Co-Authors: Yan Jiang, Theodore Feldman, Julia A M Bakx, Darren Yang, Wesley P WongAbstract:Abstract Single-molecule force spectroscopy has brought many new insights into nanoscale biology, from the functioning of molecular motors, to the mechanical response of soft materials within the cell. Yet in the extreme-force regime, limitations in current approaches have restricted biomolecular studies, particularly under conditions of constant-force and when combined with single-molecule fluorescence. We have met these challenges with a surface-free force spectroscopy approach based on high-speed single-molecule Hydrodynamic Trapping, which is not only inexpensive and accessible, but also able to probe extremely high tensions. Furthermore, our approach does not require difficult covalent attachment chemistries, and enables simultaneous force application and single-molecule fluorescence. Using this approach, we have induced a recently discovered hyperstretched (HS) state in regions of partially intercalated double-stranded (dsDNA) by applying forces up to 250 pN. The HS state of dsDNA has twice the contour length of B-DNA and was initially discovered under conditions of high tension in the presence of free intercalating dyes. It was hypothesized that regions of HS DNA could also be induced without the aid of intercalators if high-enough forces were applied, but this hypothesis had not been tested until now. Combining force application with single-molecule fluorescence imaging was critical for distinguishing HS DNA from single-stranded DNA that can result from peeling. High-speed Hydrodynamic Trapping is a powerful yet accessible force spectroscopy method that will be a significant addition to the single-molecule toolbox, enabling the mechanics of nanostructures to be probed in previously difficult to access regimes.
Darren Yang - One of the best experts on this subject based on the ideXlab platform.
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stretching dna to twice the normal length with single molecule Hydrodynamic Trapping
Lab on a Chip, 2020Co-Authors: Yan Jiang, Theodore Feldman, Julia A M Bakx, Darren Yang, Wesley P WongAbstract:Single-molecule force spectroscopy has brought many new insights into nanoscale biology, from the functioning of molecular motors to the mechanical response of soft materials within the cell. To expand the single-molecule toolbox, we have developed a surface-free force spectroscopy assay based on a high-speed Hydrodynamic trap capable of applying extremely high tensions for long periods of time. High-speed single-molecule Trapping is enabled by a rigid and gas-impermeable microfluidic chip, rapidly and inexpensively fabricated out of glass, double-sided tape and UV-curable adhesive. Our approach does not require difficult covalent attachment chemistries, and enables simultaneous force application and single-molecule fluorescence. Using this approach, we have induced a highly extended state with twice the contour length of B-DNA in regions of partially intercalated double-stranded (dsDNA) by applying forces up to 250 pN. This highly extended state resembles the hyperstretched state of dsDNA, which was initially discovered as a structure fully intercalated by dyes under high tension. It has been hypothesized that hyperstretched DNA could also be induced without the aid of intercalators if high-enough forces were applied, which matches our observation. Combining force application with single-molecule fluorescence imaging is critical for distinguishing hyperstretched DNA from single-stranded DNA that can result from peeling. High-speed Hydrodynamic Trapping is a powerful yet accessible force spectroscopy method that enables the mechanics of biomolecules to be probed in previously difficult to access regimes.
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stretching dna to twice the normal length with single molecule Hydrodynamic Trapping
bioRxiv, 2019Co-Authors: Yan Jiang, Theodore Feldman, Julia A M Bakx, Darren Yang, Wesley P WongAbstract:Abstract Single-molecule force spectroscopy has brought many new insights into nanoscale biology, from the functioning of molecular motors, to the mechanical response of soft materials within the cell. Yet in the extreme-force regime, limitations in current approaches have restricted biomolecular studies, particularly under conditions of constant-force and when combined with single-molecule fluorescence. We have met these challenges with a surface-free force spectroscopy approach based on high-speed single-molecule Hydrodynamic Trapping, which is not only inexpensive and accessible, but also able to probe extremely high tensions. Furthermore, our approach does not require difficult covalent attachment chemistries, and enables simultaneous force application and single-molecule fluorescence. Using this approach, we have induced a recently discovered hyperstretched (HS) state in regions of partially intercalated double-stranded (dsDNA) by applying forces up to 250 pN. The HS state of dsDNA has twice the contour length of B-DNA and was initially discovered under conditions of high tension in the presence of free intercalating dyes. It was hypothesized that regions of HS DNA could also be induced without the aid of intercalators if high-enough forces were applied, but this hypothesis had not been tested until now. Combining force application with single-molecule fluorescence imaging was critical for distinguishing HS DNA from single-stranded DNA that can result from peeling. High-speed Hydrodynamic Trapping is a powerful yet accessible force spectroscopy method that will be a significant addition to the single-molecule toolbox, enabling the mechanics of nanostructures to be probed in previously difficult to access regimes.
