The Experts below are selected from a list of 159147 Experts worldwide ranked by ideXlab platform
Peng Yang - One of the best experts on this subject based on the ideXlab platform.
-
tectono Thermal Evolution of cambrian ordovician source rocks and implications for hydrocarbon generation in the eastern tarim basin nw china
Journal of Asian Earth Sciences, 2020Co-Authors: Peng Yang, Zhanli Ren, Renjie Zhou, Jianxin Zhao, Liping ZhangAbstract:Abstract The tectono-Thermal Evolution is an important control on petroliferous basin development; however, this Evolution is difficult to reconstruct in sedimentary basins subjected to multiple tectono-Thermal events. The Tarim Basin is the largest petroliferous basin in northwestern China and hosts a complex oil–gas system comprising several sets of source, reservoir, and cap rocks that have experienced multiple tectonic, Thermal, and sedimentary events. Large oil and gas reserves have been discovered in the central and northern Tarim Basin during the last 30 years, but none in the eastern part of the basin. This is generally attributed to the high Thermal maturity reached by source rocks during the Late Ordovician, and subsequent hydrocarbon loss. Therefore, reconstructing the Cambrian–Ordovician tectono-Thermal Evolution is critical in facilitating successful oil and gas exploration in this region. We compiled equivalent vitrinite reflectance data (n = 178) of source rocks from seven wells in the Tarim Basin, which for Cambrian–Ordovician source rocks are >1.3%, beyond the hydrocarbon generation threshold and in the main gas and dry gas generation stages. The Cambrian–Ordovician source rocks experienced rapid burial and heating during the Caledonian period, entered the hydrocarbon generation stage during the Middle–Late Ordovician, and reached peak hydrocarbon generation at the end-Caledonian period. They might have experienced secondary hydrocarbon generation after the Jurassic. Homogenization temperatures of fluid inclusions (n = 616) from wells GC4, LX1, MD1, and YD2 as well as the modeled Thermal Evolution reveal a main hydrocarbon generation event during the Caledonian period and a secondary event in the Yanshanian and Himalayan period in other wells (LX1, MD1, and YD2). Hercynian and Indosinian uplift and exhumation in the eastern Tarim Basin controlled the main structures, and faulting created favorable conditions for secondary hydrocarbon generation and migration at this time. Since the Yanshanian and Himalayan, the Tarim Basin has experienced further sedimentation and heating, and the tectono-Thermal Evolution might have been related to the formation of the Tibetan Plateau. In summary, our reconstruction of the tectono-Thermal Evolution of Cambrian–Ordovician strata and the hydrocarbon generation history of the Tarim Basin suggests that the eastern Tarim Basin may also have hydrocarbon generation potential and can guide future oil and gas exploration.
Zarija Lukic - One of the best experts on this subject based on the ideXlab platform.
-
new constraints on igm Thermal Evolution from the lyα forest power spectrum
The Astrophysical Journal, 2019Co-Authors: Michael Walther, Jose Onorbe, Joseph F Hennawi, Zarija LukicAbstract:Author(s): Walther, M; Onorbe, J; Hennawi, JF; Lukic, Z | Abstract: © 2019. The American Astronomical Society. All rights reserved. We determine the Thermal Evolution of the intergalactic medium (IGM) over 3 Gyr of cosmic time 1.8 l z l 5.4 by comparing measurements of the Ly forest power spectrum to a suite of 70 hydrodynamical simulations. We conduct Bayesian inference of IGM Thermal parameters using an end-to-end forward modeling framework whereby mock spectra generated from our simulation grid are used to build a custom emulator that interpolates the power spectrum between Thermal grid points. The temperature at mean density T0 rises steadily from T0 ∼ 6000 K at z=5.4, peaks at 14,000 K for z3.4, and decreases at lower redshift, reaching T07000 K by z1.8. This Evolution provides conclusive evidence for photoionization heating resulting from the reionization of He II, as well as the subsequent cooling of the IGM due to the expansion of the universe after all reionization events are complete. Our results are broadly consistent with previous measurements of Thermal Evolution based on a variety of approaches, but the sensitivity of the power spectrum, the combination of high-precision measurements of largescale modes (k 0.02 s km-1) from the Baryon Oscillation Spectroscopic Survey with our recent determination of the small-scale power, our large grid of models, and our careful statistical analysis allow us to break the wellknown degeneracy between the temperature at mean density T0 and the slope of the temperature-density relation that has plagued previous analyses. At the highest redshifts, z5, we infer lower temperatures than expected from the standard picture of IGM Thermal Evolution leaving little room for additional smoothing of the Ly forest by free streaming of warm dark matter.
-
new constraints on igm Thermal Evolution from the lyα forest power spectrum
The Astrophysical Journal, 2019Co-Authors: Michael Walther, Jose Onorbe, Joseph F Hennawi, Zarija LukicAbstract:Author(s): Walther, M; Onorbe, J; Hennawi, JF; Lukic, Z | Abstract: We determine the Thermal Evolution of the intergalactic medium (IGM) over 3 Gyr of cosmic time 1.8 l z l 5.4 by comparing measurements of the Ly forest power spectrum to a suite of 70 hydrodynamical simulations. We conduct Bayesian inference of IGM Thermal parameters using an end-to-end forward modeling framework whereby mock spectra generated from our simulation grid are used to build a custom emulator that interpolates the power spectrum between Thermal grid points. The temperature at mean density T0 rises steadily from T0 ∼ 6000 K at z=5.4, peaks at 14,000 K for z3.4, and decreases at lower redshift, reaching T07000 K by z1.8. This Evolution provides conclusive evidence for photoionization heating resulting from the reionization of He II, as well as the subsequent cooling of the IGM due to the expansion of the universe after all reionization events are complete. Our results are broadly consistent with previous measurements of Thermal Evolution based on a variety of approaches, but the sensitivity of the power spectrum, the combination of high-precision measurements of largescale modes (k 0.02 s km-1) from the Baryon Oscillation Spectroscopic Survey with our recent determination of the small-scale power, our large grid of models, and our careful statistical analysis allow us to break the wellknown degeneracy between the temperature at mean density T0 and the slope of the temperature-density relation that has plagued previous analyses. At the highest redshifts, z5, we infer lower temperatures than expected from the standard picture of IGM Thermal Evolution leaving little room for additional smoothing of the Ly forest by free streaming of warm dark matter.
-
new constraints on igm Thermal Evolution from the ly alpha forest power spectrum
arXiv: Cosmology and Nongalactic Astrophysics, 2018Co-Authors: Michael Walther, Jose Onorbe, Joseph F Hennawi, Zarija LukicAbstract:We determine the Thermal Evolution of the intergalactic medium (IGM) over $3\, \mathrm{Gyr}$ of cosmic time $1.8
Xiaofang Wang - One of the best experts on this subject based on the ideXlab platform.
-
Thermal Evolution and maturation of sinian and cambrian source rocks in the central sichuan basin southwest china
Journal of Asian Earth Sciences, 2018Co-Authors: Nansheng Qiu, Anjiang Shen, Wen Liu, Xiaofang WangAbstract:Abstract The Sichuan Basin is among the basins with the most abundant oil and gas resources in China. The Sinian and Cambrian strata are the most important source rocks. Previous studies of the Thermal history of the central Sichuan Basin have focused on the Late Paleozoic and studies of the Early Paleozoic Thermal history are not available in literature and the Thermal Evolution of the Sinian and Cambrian source rocks are yet to be examined. A new Thermal history was reconstructed using integrated Thermal indicators, including apatite and zircon (U-Th)/He, zircon fission tracks, and equivalent vitrinite reflectance. The modeled results indicated that the heat flow was relatively low (
Liping Zhang - One of the best experts on this subject based on the ideXlab platform.
-
tectono Thermal Evolution of cambrian ordovician source rocks and implications for hydrocarbon generation in the eastern tarim basin nw china
Journal of Asian Earth Sciences, 2020Co-Authors: Peng Yang, Zhanli Ren, Renjie Zhou, Jianxin Zhao, Liping ZhangAbstract:Abstract The tectono-Thermal Evolution is an important control on petroliferous basin development; however, this Evolution is difficult to reconstruct in sedimentary basins subjected to multiple tectono-Thermal events. The Tarim Basin is the largest petroliferous basin in northwestern China and hosts a complex oil–gas system comprising several sets of source, reservoir, and cap rocks that have experienced multiple tectonic, Thermal, and sedimentary events. Large oil and gas reserves have been discovered in the central and northern Tarim Basin during the last 30 years, but none in the eastern part of the basin. This is generally attributed to the high Thermal maturity reached by source rocks during the Late Ordovician, and subsequent hydrocarbon loss. Therefore, reconstructing the Cambrian–Ordovician tectono-Thermal Evolution is critical in facilitating successful oil and gas exploration in this region. We compiled equivalent vitrinite reflectance data (n = 178) of source rocks from seven wells in the Tarim Basin, which for Cambrian–Ordovician source rocks are >1.3%, beyond the hydrocarbon generation threshold and in the main gas and dry gas generation stages. The Cambrian–Ordovician source rocks experienced rapid burial and heating during the Caledonian period, entered the hydrocarbon generation stage during the Middle–Late Ordovician, and reached peak hydrocarbon generation at the end-Caledonian period. They might have experienced secondary hydrocarbon generation after the Jurassic. Homogenization temperatures of fluid inclusions (n = 616) from wells GC4, LX1, MD1, and YD2 as well as the modeled Thermal Evolution reveal a main hydrocarbon generation event during the Caledonian period and a secondary event in the Yanshanian and Himalayan period in other wells (LX1, MD1, and YD2). Hercynian and Indosinian uplift and exhumation in the eastern Tarim Basin controlled the main structures, and faulting created favorable conditions for secondary hydrocarbon generation and migration at this time. Since the Yanshanian and Himalayan, the Tarim Basin has experienced further sedimentation and heating, and the tectono-Thermal Evolution might have been related to the formation of the Tibetan Plateau. In summary, our reconstruction of the tectono-Thermal Evolution of Cambrian–Ordovician strata and the hydrocarbon generation history of the Tarim Basin suggests that the eastern Tarim Basin may also have hydrocarbon generation potential and can guide future oil and gas exploration.
D Blaschke - One of the best experts on this subject based on the ideXlab platform.
-
population synthesis as a probe of neutron star Thermal Evolution
Astronomy and Astrophysics, 2006Co-Authors: S B Popov, H Grigorian, R Turolla, D BlaschkeAbstract:The study of Thermal emission from isolated, cooling neutron stars plays a key role in probing the physical conditions of both the star crust and the core. The comparison of theoretical models for the star Thermal Evolution with the surface temperature derived from X-ray observations of sources of different age is one of the main tools to investigate the properties of the interior and constrain the equation of state. Here we propose to use population synthesis studies as an independent approach to test the physics governing the star cooling. Theoretical LogN - Log S distributions depend on the assumed neutron star Thermal Evolution. We have competed distributions for several different cooling scenarios and found that comparison with the observed Log N - Log S of isolated neutron stars is effective in discriminating among cooling models. Among the eleven cooling models considered in this paper, all of which may reproduce the observed temperature vs. age diagram, only at most three can explain the Log N - Log S distribution of close-by cooling neutron stars. The Log N - Log S test, being a "global" one and despite some limitations, appears indeed capable to ideally complement the standard temperature vs. age test used up to now.
-
population synthesis as a probe of neutron star Thermal Evolution
arXiv: Astrophysics, 2004Co-Authors: S B Popov, H Grigorian, R Turolla, D BlaschkeAbstract:The study of Thermal emission from isolated, cooling neutron stars plays a key role in probing the physical conditions of both the star crust and the core. The comparison of theoretical models for the star Thermal Evolution with the surface temperature derived from X-ray observations of sources of different age is one of the main tools to investigate the properties of the interior and constrain the equation of state. Here we propose to use population synthesis studies as an independent approach to test the physics governing the star cooling. Theoretical Log N - Log S distributions depend on the assumed neutron star Thermal Evolution. We have computed distributions for several different cooling scenarios and found that comparison with the observed Log N - Log S of isolated neutron stars is effective in discriminating among cooling models. Among the eleven cooling models considered in this paper, all of which may reproduce the observed temperature vs. age diagram, only at most three can explain the Log N - Log S distribution of close-by cooling neutron stars. The Log N - Log S test, being a ``global'' one and despite some limitations, appears capable of complementing the standard temperature vs. age test used up to now.
