時 間：2022年4月21日（周四）9:00-10:30
騰訊會議：650-675-914
報告題目：Understanding of Anisotropic Nanoscale Pore Deformations of Coal and Shale under Far-Field Stress Boundary
報 告 人：Dr. Shimin Liu（劉世民 博士）
報 告 人：劉世民博士，美國賓州州立大學能源與礦物工程學院終身教授、博士生導師，International Journal of Coal Science & Technology （IJCST）主編。長期從事煤層氣、頁巖氣等非常規(guī)儲層中氣體滲流、氣-巖相互作用機制、地質(zhì)資源評價、二氧化碳地質(zhì)封存等方面的研究工作，在Fuel，International Journal of Coal Geology，Journal of Petroleum Science and Engineering，Journal of Natural Gas Science and Engineering等國際一流期刊發(fā)表學術(shù)論文200余篇，H指數(shù)43，并與美國橡樹嶺國家實驗室、美國地質(zhì)調(diào)查局等研究機構(gòu)建立了長期的專業(yè)合作關(guān)系。
報告內(nèi)容：The nature of flow in shale is multi-mechanistical processes，including sorption，diffusion，slip flow，advection，and flow-induced micro-structuring，which are dynamically coupled with the pore structure deformation under stress condition. The state-of-the-art in-situ small angle neutron scattering （SANS） was used to characterize the nanopore deformation and its anisotropy under far-field uniaxial stress conditions. Porod invariant mapping was used to estimate the apparent porosities at different azimuthal angles. Structure free orientation factors were used to characterize orientation degree in nanopores under stress quantitatively. Based on the results，higher values of apparent porosities are shown near the bedding direction. At different azimuthal angles，the apparent porosities increase with increasing uniaxial stress in the elastic deformation range （54-575 bar） for the measured rock. The pore-scale degree of orientation is a size-dependent parameter，and pore orientation along the bedding generally increases as pore size increases. The degree of orientation in nanopores （in a size range between～2×103 ? and～15 ?） tends to increase first and then decreases with increasing stress loading，although different from that of macropores，indicating higher stresses on the nanopore edges along the bedding direction and then on the nanopore body along the normal direction. There is no distinct permanent porosity change within the measured stress range （0-575 bar） after the stress relief. As the Editor-in-Chief of IJCST，Dr. Liu will also introduce the journal’s scope and its role in the energy industry，as well as the decision-making process for the received manuscripts in the peer-reviewed journal.
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