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Author

Xianqing Li

Other affiliations: China University of Technology
Bio: Xianqing Li is an academic researcher from China University of Mining and Technology. The author has contributed to research in topics: Oil shale & Coal. The author has an hindex of 9, co-authored 21 publications receiving 202 citations. Previous affiliations of Xianqing Li include China University of Technology.
Topics: Oil shale, Coal, Methane, Coal mining, Geology

Papers
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Journal ArticleDOI
TL;DR: In this article, the geochemical and geological characteristics of marine-continental transitional shales from the Longtan Formation in this area have been investigated using a field investigation and relevant laboratory analyses.

40 citations

Journal ArticleDOI
TL;DR: In this paper, the authors performed pyrolysis experiments on typical source rock and crude oil samples selected from the eastern Tarim basin, evaluated their kinetic parameters of gas generation and methane carbon isotopic fractionation, and extrapolated them to geological conditions.

38 citations

Journal ArticleDOI
TL;DR: In this article, the characteristics and influence on methane adsorption capacity of the pore structure of coals were investigated through an approach that integrates mercury intrusion porosimetry, low pressure N2/CO2 adaption, and field emission scanning electron microscopy.

37 citations

Journal ArticleDOI
TL;DR: The characterization of the pore structure and shale gas content provides useful information for shale gas reservoir assessment and evaluation and guides the exploration and development of shale gas fields as discussed by the authors, which can be used to guide the development of new shale fields.
Abstract: The characterization of the pore structure and shale gas content provides useful information for shale gas reservoir assessment and evaluation and guides the exploration and development of shale ga...

36 citations

Journal ArticleDOI
TL;DR: In this paper, the Upper Permian Dalong shale in northern Sichuan Basin was selected to qualitatively and quantitatively characterize the different types and sizes of pore system in marine shale.

27 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, three sets of pyrolysis experiments were performed for oil alone, oil plus montmorillonite and oil plus calcite at two heating rates of 2.5 and 20.5°C/h in confined systems (gold capsules).

123 citations

Journal ArticleDOI
TL;DR: In this article, a compositional kinetic model of gas generation from oil cracking is suggested based on pyrolysis data using sealed gold tubes, and the pressure-volume changes are recalculated based on the new kinetic model under various geological conditions.
Abstract: Previous pressure-volume calculations during oil cracking to gas, based on the conventional model that presupposes oil cracking to be completed by approximately 150C, underestimate the potential for gas accumulation in petroleum reservoirs. In this article, a compositional kinetic model of gas generation from oil cracking is suggested based on pyrolysis data using sealed gold tubes, and the pressure-volume changes are recalculated based on the new kinetic model under various geological conditions. The kinetic modeling of oil cracking confirms that crude oil begins cracking at about 160C for a heating rate of 2C/m.y., and that the oil-cracking process has two distinct stages with significant differences in gas composition. The first stage is characterized by dominant C2–5 wet gases, whereas the second is characterized by the recracking of C2–5 wet gases to methane and pyrobitumen, leading to a progressive increasing dryness of the gas. The pressure-volume-temperature simulations of oil cracking to gas show that initial oil saturation, temperature-pressure gradients, and openness of reservoirs are important geological factors that control gas accumulation in original petroleum reservoirs. For a reservoir that is geologically open and saturated with 100% oil, gas spills out of the trap at 196C. The gas loss at 240C is almost 50% of the total gas, far lower than the 75% based on the conventional model of oil destruction. With lower oil saturation, the gas loss decreases because the gas-water contact can shift downward, and the gas loss occurs mainly by solution. For effectively isolated reservoirs, oil cracking readily exceeds lithostatic pressure, leading to reservoir fracturing, which becomes more obvious when oil saturation decreases. The calculated fracturing temperatures for 100 and 50 vol.% oil saturations correspond to oil destructions of 95% and 86.4%, greatly exceeding the value of 1% as suggested by previous studies. A conceptual model of gas accumulation and loss in isolated and open geological conditions for a reservoir with 50% oil saturation is suggested. On the basis of this model, the Triassic carbonate gas pool in northeastern Sichuan Basin was discussed as a typical example for in-situ accumulation of gas cracked from reservoired oils. The present model infers that the reservoired oils were completely cracked into gas at 87.6 Ma, and that 75–85% of the gas has been preserved in the original reservoir rocks to form the in-situ gas pools with a huge amount of gas resources. We believe that gas accumulation from oil cracking in original petroleum reservoirs is much more prospective than previously thought, and that gas cracked from oil has great potential in other areas of the Sichuan Basin and the eastern Tarim Basin.

118 citations

Journal ArticleDOI
Guoyi Hu1, Guoyi Hu2, Li Jin1, Shan Xiuqin1, Han Zhongxi1 
TL;DR: In this paper, the genetic type, source and charging history of natural gas in the Yulin gas field in the Ordos Basin have been studied by combining the carbon isotopic composition of the natural gas and geochemical characteristics of light hydrocarbons with carbon isotope fractionation model results and fluid inclusion analysis.

92 citations

Journal ArticleDOI
TL;DR: In this article, the pore structures of marine and lacustrine shales were characterized and the effects of organic matter abundance, maturity and inorganic minerals on porosity were investigated.

83 citations

Journal ArticleDOI
TL;DR: In this article, the influence of supercritical CO2 (ScCO2) exposure on CH4 and CO2 adsorption behavior of shale was studied, and the pore structure and functional groups of different shale samples before and after ScCO2 (P = 8 MPa, 12 MPa and 16 MPa; T = 35 °C) exposure were measured by low-pressure nitrogen adsorptions and the Fourier transform infrared spectroscopy (FTIR) method, respectively.
Abstract: The interaction of shale–CO2 during the CO2 sequestration and enhanced shale gas recovery process has significant influence on the adsorption properties of shale. In this study, the influence of supercritical CO2 (ScCO2) exposure on CH4 and CO2 adsorption behavior of shale was studied. The pore structure and functional groups of different shale samples before and after ScCO2 (P = 8 MPa, 12 MPa, 16 MPa; T = 35 °C) exposure were measured by low-pressure nitrogen adsorption and the Fourier transform infrared spectroscopy (FTIR) method, respectively. Moreover, CH4 and CO2 adsorption isotherms of shale samples before and after ScCO2 exposure were also obtained to reveal the mechanism of the influence of ScCO2 exposure on CH4 and CO2 adsorption behaviors of shale. The results indicated that after treatment by ScCO2 the adsorption capacity of CO2 and CH4 in all tested samples was decreased. The main reason for the decrease is the change of pore structures, mineral compositions, and surface chemistry in shale cau...

76 citations