The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Hiroshi Kurikami - One of the best experts on this subject based on the ideXlab platform.
-
The relationships among brittleness, deformation behavior, and transport properties in Mudstones: An example from the Horonobe Underground Research Laboratory, Japan
Journal of Geophysical Research, 2011Co-Authors: Eiichi Ishii, Hiroyuki Sanada, Hironori Funaki, Yutaka Sugita, Hiroshi KurikamiAbstract:[1] Mudstones are low-permeability sedimentary rocks; however, when shear stresses induced by tectonic movement or nonhydrostatic stresses exceed the shear strength of the rock, brittle or ductile deformation occurs. The nature of this deformation is controlled by the brittleness of the Mudstone. If brittle deformation occurs, the resulting dilatant structures may increase the permeability and change the transport properties of the strata. This paper addresses the relationships among brittleness, deformation behavior, and transport properties in Mudstones at the Horonobe Underground Research Laboratory, Japan. Geological, mechanical, and hydrogeological data from borehole investigations and laboratory tests were systematically interpreted using a brittleness index (BRI), which is the ratio of the unconfined compressive strength to the effective vertical stress. For Mudstones under natural strain rates and low temperatures, ductile deformation occurs when BRI 8, although semibrittle behavior may also occur at the brittle-ductile boundary. When BRI >8 and faulting is well developed, the Mudstone behaves hydrogeologically as a fractured medium at the mesoscopic scale, whereas for BRI
-
the relationships among brittleness deformation behavior and transport properties in Mudstones an example from the horonobe underground research laboratory japan
Journal of Geophysical Research, 2011Co-Authors: Eiichi Ishii, Hiroyuki Sanada, Hironori Funaki, Yutaka Sugita, Hiroshi KurikamiAbstract:[1] Mudstones are low-permeability sedimentary rocks; however, when shear stresses induced by tectonic movement or nonhydrostatic stresses exceed the shear strength of the rock, brittle or ductile deformation occurs. The nature of this deformation is controlled by the brittleness of the Mudstone. If brittle deformation occurs, the resulting dilatant structures may increase the permeability and change the transport properties of the strata. This paper addresses the relationships among brittleness, deformation behavior, and transport properties in Mudstones at the Horonobe Underground Research Laboratory, Japan. Geological, mechanical, and hydrogeological data from borehole investigations and laboratory tests were systematically interpreted using a brittleness index (BRI), which is the ratio of the unconfined compressive strength to the effective vertical stress. For Mudstones under natural strain rates and low temperatures, ductile deformation occurs when BRI 8, although semibrittle behavior may also occur at the brittle-ductile boundary. When BRI >8 and faulting is well developed, the Mudstone behaves hydrogeologically as a fractured medium at the mesoscopic scale, whereas for BRI <8 the Mudstone behaves hydrogeologically as a porous medium, even if faulting is extensive. The BRI concept is a useful tool for systematically characterizing the hydromechanical behavior of Mudstones; for example, when assessing the effectiveness of Mudstone as a long-term barrier in disposal repositories for radioactive waste.
Eiichi Ishii - One of the best experts on this subject based on the ideXlab platform.
-
The relationships among brittleness, deformation behavior, and transport properties in Mudstones: An example from the Horonobe Underground Research Laboratory, Japan
Journal of Geophysical Research, 2011Co-Authors: Eiichi Ishii, Hiroyuki Sanada, Hironori Funaki, Yutaka Sugita, Hiroshi KurikamiAbstract:[1] Mudstones are low-permeability sedimentary rocks; however, when shear stresses induced by tectonic movement or nonhydrostatic stresses exceed the shear strength of the rock, brittle or ductile deformation occurs. The nature of this deformation is controlled by the brittleness of the Mudstone. If brittle deformation occurs, the resulting dilatant structures may increase the permeability and change the transport properties of the strata. This paper addresses the relationships among brittleness, deformation behavior, and transport properties in Mudstones at the Horonobe Underground Research Laboratory, Japan. Geological, mechanical, and hydrogeological data from borehole investigations and laboratory tests were systematically interpreted using a brittleness index (BRI), which is the ratio of the unconfined compressive strength to the effective vertical stress. For Mudstones under natural strain rates and low temperatures, ductile deformation occurs when BRI 8, although semibrittle behavior may also occur at the brittle-ductile boundary. When BRI >8 and faulting is well developed, the Mudstone behaves hydrogeologically as a fractured medium at the mesoscopic scale, whereas for BRI
-
the relationships among brittleness deformation behavior and transport properties in Mudstones an example from the horonobe underground research laboratory japan
Journal of Geophysical Research, 2011Co-Authors: Eiichi Ishii, Hiroyuki Sanada, Hironori Funaki, Yutaka Sugita, Hiroshi KurikamiAbstract:[1] Mudstones are low-permeability sedimentary rocks; however, when shear stresses induced by tectonic movement or nonhydrostatic stresses exceed the shear strength of the rock, brittle or ductile deformation occurs. The nature of this deformation is controlled by the brittleness of the Mudstone. If brittle deformation occurs, the resulting dilatant structures may increase the permeability and change the transport properties of the strata. This paper addresses the relationships among brittleness, deformation behavior, and transport properties in Mudstones at the Horonobe Underground Research Laboratory, Japan. Geological, mechanical, and hydrogeological data from borehole investigations and laboratory tests were systematically interpreted using a brittleness index (BRI), which is the ratio of the unconfined compressive strength to the effective vertical stress. For Mudstones under natural strain rates and low temperatures, ductile deformation occurs when BRI 8, although semibrittle behavior may also occur at the brittle-ductile boundary. When BRI >8 and faulting is well developed, the Mudstone behaves hydrogeologically as a fractured medium at the mesoscopic scale, whereas for BRI <8 the Mudstone behaves hydrogeologically as a porous medium, even if faulting is extensive. The BRI concept is a useful tool for systematically characterizing the hydromechanical behavior of Mudstones; for example, when assessing the effectiveness of Mudstone as a long-term barrier in disposal repositories for radioactive waste.
Yu Qi - One of the best experts on this subject based on the ideXlab platform.
-
organic matter provenance and depositional environment of marine to continental Mudstones and coals in eastern ordos basin china evidence from molecular geochemistry and petrology
International Journal of Coal Geology, 2020Co-Authors: Leon Bowen, Kun Yu, Yiwen Ju, Yu Qi, Cheng Huang, Weilai ZhangAbstract:Abstract Cyclothems, composed of interbedded Mudstone, coal and sandstone layers, make up the Taiyuan and Shanxi Formations in the Late Carboniferous to Early Permian in North China under a marine-to-continental depositional environment. The cyclothems act as important fossil energy hosts, such as coalbeds, hydrocarbon source rocks and unconventional natural gas reservoirs. Organic geochemistry and petrology of Mudstones and coals in the Taiyuan and Shanxi Formations in the eastern Ordos Basin were studied to reveal the organic matter sources and paleoenvironments. Total organic carbon (TOC) contents vary from 1.1 wt% (Mudstone) to 72.6 wt% (coal). The samples are mainly within the oil window, with the Tmax values ranging from 433 to 469 °C. Organic petrology and source biomarkers indicate that the Mudstones were sourced from a mixed organic matter input, and terrigenous organic matter predominates over aquatic organic matter. The coals are mostly sourced by terrigenous organic matter inputs. High concentrations of hopanes argue for a strong bacterial input. Some m/z 217 mass chromatograms have peaks at the hopanes' retention times as a result of high hopane to sterane ratios. These hopane-derived peaks do not interfere the identification of the steranes because the hopanes and the steranes have different retention times. Maturity-dependent biomarkers demonstrate that the samples have been thermally mature, which agree with the Tmax values. Anomalously low C29 20S/(20S + 20R) and C29 ββ/(ββ + αα) sterane ratios are present in all the samples, and are interpreted as due to the terrigenous organic matter input or the coal-related depositional environment. In addition, biomarkers and iron sulfide morphology indicate that the organic matter of the Mudstones deposited in a proximal setting with shallow, brackish/fresh water bodies. With consideration of preservation of organic matter, the redox conditions are dysoxic. Redox oscillations resulted in the records of oxic conditions in some samples. Finally, the coals and the Mudstones mainly generate gas and have poor oil generative potential.
Cheng Huang - One of the best experts on this subject based on the ideXlab platform.
-
organic matter provenance and depositional environment of marine to continental Mudstones and coals in eastern ordos basin china evidence from molecular geochemistry and petrology
International Journal of Coal Geology, 2020Co-Authors: Leon Bowen, Kun Yu, Yiwen Ju, Yu Qi, Cheng Huang, Weilai ZhangAbstract:Abstract Cyclothems, composed of interbedded Mudstone, coal and sandstone layers, make up the Taiyuan and Shanxi Formations in the Late Carboniferous to Early Permian in North China under a marine-to-continental depositional environment. The cyclothems act as important fossil energy hosts, such as coalbeds, hydrocarbon source rocks and unconventional natural gas reservoirs. Organic geochemistry and petrology of Mudstones and coals in the Taiyuan and Shanxi Formations in the eastern Ordos Basin were studied to reveal the organic matter sources and paleoenvironments. Total organic carbon (TOC) contents vary from 1.1 wt% (Mudstone) to 72.6 wt% (coal). The samples are mainly within the oil window, with the Tmax values ranging from 433 to 469 °C. Organic petrology and source biomarkers indicate that the Mudstones were sourced from a mixed organic matter input, and terrigenous organic matter predominates over aquatic organic matter. The coals are mostly sourced by terrigenous organic matter inputs. High concentrations of hopanes argue for a strong bacterial input. Some m/z 217 mass chromatograms have peaks at the hopanes' retention times as a result of high hopane to sterane ratios. These hopane-derived peaks do not interfere the identification of the steranes because the hopanes and the steranes have different retention times. Maturity-dependent biomarkers demonstrate that the samples have been thermally mature, which agree with the Tmax values. Anomalously low C29 20S/(20S + 20R) and C29 ββ/(ββ + αα) sterane ratios are present in all the samples, and are interpreted as due to the terrigenous organic matter input or the coal-related depositional environment. In addition, biomarkers and iron sulfide morphology indicate that the organic matter of the Mudstones deposited in a proximal setting with shallow, brackish/fresh water bodies. With consideration of preservation of organic matter, the redox conditions are dysoxic. Redox oscillations resulted in the records of oxic conditions in some samples. Finally, the coals and the Mudstones mainly generate gas and have poor oil generative potential.
-
influences of organic matter and kaolinite on pore structures of transitional organic rich Mudstone with an emphasis on s2 controlling specific surface area
Fuel, 2019Co-Authors: Cheng Huang, Hongjian Zhu, Yuan Bao, Shangzhi Meng, Wangang ChenAbstract:Abstract Nanopore networks in organic-rich Mudstone play a key role in providing pore space, surface area and channels for gas storage and migration. Controls of nanopore development are still poorly understood, especially for transitional Mudstone. Differing from marine and lacustrine Mudstone, transitional Mudstone is characterized by high kaolinite and low illite contents, and complex organic input. Six transitional Mudstones in Linxing Area, eastern Ordos Basin were selected to figure out the influence of kaolinite and organic matter (OM) on pore structures. Sample preparation (OM-removal and kerogen isolation), mineralogical, organic petrographic and geochemical analyses and textural analysis (low-pressure Ar and CO2 adsorption) were performed. Data in other publications were used to test and perfect our conclusion of specific surface area changing with S2 (second peak in Rock-Eval pyrolysis). Our study demonstrates the pores within 5–50 nm are mainly controlled by quartz contents and are negatively correlated with kaolinite or clay mineral contents. Kaolinite content has little influence on specific surface area, but organic pores, most of which are within 0.3 to ∼5 nm, contribute much to specific surface area. Higher proportion of marine OM has larger organic pores. “Quasi-parabolic +” was used to describe the firstly increasing, secondly decreasing and then uncertain relationship between specific surface area and S2 values. The relationship was found in both transitional and marine Mudstones. Surface area changing with S2 is because TOC, thermal maturity and organic input affect organic pore development and also control S2 values. Micropore specific area of kerogen has a firstly increasing and secondly decreasing trend with hydrogen index (HI) values while S2 affects micropore surface area of Mudstones. Our findings can be used to estimate pore parameters of organic-rich Mudstone.
Hiroyuki Sanada - One of the best experts on this subject based on the ideXlab platform.
-
The relationships among brittleness, deformation behavior, and transport properties in Mudstones: An example from the Horonobe Underground Research Laboratory, Japan
Journal of Geophysical Research, 2011Co-Authors: Eiichi Ishii, Hiroyuki Sanada, Hironori Funaki, Yutaka Sugita, Hiroshi KurikamiAbstract:[1] Mudstones are low-permeability sedimentary rocks; however, when shear stresses induced by tectonic movement or nonhydrostatic stresses exceed the shear strength of the rock, brittle or ductile deformation occurs. The nature of this deformation is controlled by the brittleness of the Mudstone. If brittle deformation occurs, the resulting dilatant structures may increase the permeability and change the transport properties of the strata. This paper addresses the relationships among brittleness, deformation behavior, and transport properties in Mudstones at the Horonobe Underground Research Laboratory, Japan. Geological, mechanical, and hydrogeological data from borehole investigations and laboratory tests were systematically interpreted using a brittleness index (BRI), which is the ratio of the unconfined compressive strength to the effective vertical stress. For Mudstones under natural strain rates and low temperatures, ductile deformation occurs when BRI 8, although semibrittle behavior may also occur at the brittle-ductile boundary. When BRI >8 and faulting is well developed, the Mudstone behaves hydrogeologically as a fractured medium at the mesoscopic scale, whereas for BRI
-
the relationships among brittleness deformation behavior and transport properties in Mudstones an example from the horonobe underground research laboratory japan
Journal of Geophysical Research, 2011Co-Authors: Eiichi Ishii, Hiroyuki Sanada, Hironori Funaki, Yutaka Sugita, Hiroshi KurikamiAbstract:[1] Mudstones are low-permeability sedimentary rocks; however, when shear stresses induced by tectonic movement or nonhydrostatic stresses exceed the shear strength of the rock, brittle or ductile deformation occurs. The nature of this deformation is controlled by the brittleness of the Mudstone. If brittle deformation occurs, the resulting dilatant structures may increase the permeability and change the transport properties of the strata. This paper addresses the relationships among brittleness, deformation behavior, and transport properties in Mudstones at the Horonobe Underground Research Laboratory, Japan. Geological, mechanical, and hydrogeological data from borehole investigations and laboratory tests were systematically interpreted using a brittleness index (BRI), which is the ratio of the unconfined compressive strength to the effective vertical stress. For Mudstones under natural strain rates and low temperatures, ductile deformation occurs when BRI 8, although semibrittle behavior may also occur at the brittle-ductile boundary. When BRI >8 and faulting is well developed, the Mudstone behaves hydrogeologically as a fractured medium at the mesoscopic scale, whereas for BRI <8 the Mudstone behaves hydrogeologically as a porous medium, even if faulting is extensive. The BRI concept is a useful tool for systematically characterizing the hydromechanical behavior of Mudstones; for example, when assessing the effectiveness of Mudstone as a long-term barrier in disposal repositories for radioactive waste.
