Dynamic imaging of oil shale pyrolysis using synchrotron X‐ray microtomography

The structure and connectivity of the pore space during the pyrolysis of oil shales determines hydrocarbon flow behavior and ultimate recovery. We image the time evolution of the pore and microfracture networks during oil shale pyrolysis using synchrotron X-ray microtomography. Immature Green River (Mahogany Zone) shale samples were thermally matured under vacuum conditions at temperatures up to 500°C while being periodically imaged with a 2 µm voxel size. The structural transformation of both organic-rich and organic-lean layers within the shale was quantified. The images reveal a dramatic change in porosity accompanying pyrolysis between 390 and 400°C with the formation of micron-scale heterogeneous pores. With a further increase in temperature, the pores steadily expand resulting in connected microfracture networks that predominantly develop along the kerogen-rich laminations.

[1]  Martin J. Blunt,et al.  The Imaging of Dynamic Multiphase Fluid Flow Using Synchrotron-Based X-ray Microtomography at Reservoir Conditions , 2015, Transport in Porous Media.

[2]  P. Williams,et al.  Influence of particle grain size on the yield and composition of products from the pyrolysis of oil shales , 1998 .

[3]  C. Roy,et al.  The Pyrolysis under Vacuum of Aspen Poplar , 1985 .

[4]  A. Khalil.  OIL SHALE PYROLYSIS AND EFFECT OF PARTICLE SIZE ON THE COMPOSITION OF SHALE OIL , 2013 .

[5]  J. Soone,et al.  SUSTAINABLE UTILIZATION OF OIL SHALE RESOURCES AND COMPARISON OF CONTEMPORARY TECHNOLOGIES USED FOR OIL SHALE PROCESSING , 2003, Oil Shale.

[6]  R. L. Braun,et al.  Oil-shale pyrolysis: Kinetics and mechanism of oil production , 1975 .

[7]  Yaoqing Hu,et al.  THERMAL CRACKING AND CORRESPONDING PERMEABILITY OF FUSHUN OIL SHALE , 2011 .

[8]  Miguel A. Galán,et al.  Kinetics of the thermal decomposition of oil shale from Puertollano (Spain) , 2001 .

[9]  N. Otsu.  A threshold selection method from gray level histograms , 1979 .

[10]  J. R. Dyni,et al.  GEOLOGY AND RESOURCES OF SOME WORLD OIL-SHALE DEPOSITS , 2003, Oil Shale.

[11]  Paul T. Williams,et al.  Influence of residence time and catalyst regeneration on the pyrolysis–zeolite catalysis of oil shale , 2001 .

[12]  R. Ketcham,et al.  Acquisition, optimization and interpretation of X-ray computed tomographic imagery: applications to the geosciences , 2001 .

[13]  F. Miknis,et al.  N.m.r. study of US Eastern and Western shale oils produced by pyrolysis and hydropyrolysis , 1982 .

[14]  M. Blunt,et al.  Pore-scale imaging and modelling , 2013 .

[15]  Florian Fusseis,et al.  A brief guide to synchrotron radiation-based microtomography in (structural) geology and rock mechanics , 2014 .

[16]  P. Williams,et al.  Investigation of oil-shale pyrolysis processing conditions using thermogravimetric analysis , 2000 .

[17]  Ryan J. Gillis,et al.  Characterization of Macromolecular Structure Elements from a Green River Oil Shale, II. Characterization of Pyrolysis Products by 13C NMR, GC/MS, and FTIR , 2014 .

[18]  Xiangxin Han,et al.  Studies of the effect of retorting factors on the yield of shale oil for a new comprehensive utilization technology of oil shale , 2009 .

[19]  Mustafa Versan Kok,et al.  Comparative pyrolysis and combustion kinetics of oil shales , 2000 .

[20]  W. V. Swaaij,et al.  Fast pyrolysis in a novel wire-mesh reactor: design and initial results , 2012 .

[21]  Jianqiu Wang,et al.  World’s Oil Shale Available Retorting Technologies And The Forecast Of Shale Oil Production , 2008 .

[22]  M. Thring.  World Energy Outlook , 1977 .

[23]  Y. Liu,et al.  INFLUENCE OF RETORTING CONDITIONS ON THE PYROLYSIS OF YAOJIE OIL SHALE , 2014 .

[24]  Michael E. Brownfield,et al.  Assessment of in-place oil shale resources of the Green River Formation, Piceance Basin, western Colorado , 2009 .

[25]  T. Fletcher,et al.  Characterization of Macromolecular Structure of Pyrolysis Products from a Colorado Green River Oil Shale , 2013 .

[26]  Ge Zhi-xin.  World progress of oil shale in-situ exploitation methods , 2009 .

[27]  Guangwen Xu,et al.  Oil shale pyrolysis in indirectly heated fixed bed with internals under reduced pressure , 2016 .

[28]  Erik H. Saenger,et al.  Synchrotron-based X-ray tomographic microscopy for rock physics investigations , 2013 .

[29]  M. Blunt,et al.  Imaging of oil layers, curvature and contact angle in a mixed‐wet and a water‐wet carbonate rock , 2016 .

[30]  K. Rajeshwar.  The kinetics of the thermal decomposition of green river oil shale kerogen by non-isothermal thermogravimetry , 1981 .

[31]  Martin J. Blunt,et al.  Pore‐scale imaging of geological carbon dioxide storage under in situ conditions , 2013 .

[32]  C. Roy,et al.  Oil production by vacuum pyrolysis of Canadian oil shales and fate of the biological markers , 1999 .

[33]  B. Tsyntsarski,et al.  STEAM PYROLYSIS OF BULGARIAN OIL SHALE KEROGEN , 2008 .

[34]  Y. Yürüm,et al.  Effect of the mineral matrix in the reactions of oil shales: 1. Pyrolysis reactions of Turkish Göynük and US Green River oil shales , 1998 .

[35]  Jeong-Geol Na,et al.  Effect of oil shale retorting temperature on shale oil yield and properties , 2012 .

[36]  A. Burnham.  Chemistry and Kinetics of Oil Shale Retorting , 2010 .

[37]  S. D. Probert,et al.  Evaluation of oil yield from Jordanian oil shales , 1999 .

[38]  Mingdong Chen,et al.  FLASH PYROLYSIS OF FUSHUN OIL SHALE FINE PARTICLES IN AN EXPERIMENTAL FLUIDIZED-BED REACTOR , 2010 .

[39]  Frieder Enzmann,et al.  Real-time 3D imaging of Haines jumps in porous media flow , 2013, Proceedings of the National Academy of Sciences.

[40]  M. V. Kok.  Thermal investigation of Seyitomer oil shale , 2001 .

[41]  Milind Deo,et al.  Detailed kinetic analysis of oil shale pyrolysis TGA data , 2012 .

[42]  Peter D. Lee,et al.  Modelling particle scale leach kinetics based on X-ray computed micro-tomography images , 2016 .

[43]  Milind Deo,et al.  Compositional and kinetic analysis of oil shale pyrolysis using TGA–MS , 2012 .

[44]  Martin J. Blunt,et al.  Reservoir condition imaging of reactive transport in heterogeneous carbonates using fast synchrotron tomography - effect of initial pore structure and flow conditions , 2016 .

[45]  B. Tissot,et al.  Role of mineral matrix in kerogen pyrolysis; influence on petroleum generation and migration , 1980 .

[46]  S. D. Probert,et al.  Non-isothermal thermogravimetry and decomposition kinetics of two Jordanian oil shales under different processing conditions , 2000 .

[47]  Alexander G. Schwing,et al.  Multiphase flow in porous rock imaged under dynamic flow conditions with fast X-Ray computed microtomography , 2014 .

[48]  Paul T. Williams,et al.  Influence of process conditions on the pyrolysis of Pakistani oil shales , 1999 .

[49]  T. Durusoy,et al.  Effect of Heating Rate and Particle Size on the Pyrolysis of Göynük Oil Shale , 2005 .

[50]  Mark A. Knackstedt,et al.  Multi-scale characterisation of coastal sand aquifer media for contaminant transport using X-ray computed tomography , 2011 .

[51]  Peter D. Lee,et al.  Quantifying and minimising systematic and random errors in X-ray micro-tomography based volume measurements , 2015, Comput. Geosci..

[52]  Jean-Michel Morel,et al.  Nonlocal Image and Movie Denoising , 2008, International Journal of Computer Vision.

[53]  L. Coshell,et al.  X-ray computed tomography of Australian oil shales: non-destructive visualization and density determination , 1994 .

[54]  A. Brandt.  Converting oil shale to liquid fuels: energy inputs and greenhouse gas emissions of the Shell in situ conversion process. , 2008, Environmental science & technology.

[55]  Martin J Blunt,et al.  Dynamic three-dimensional pore-scale imaging of reaction in a carbonate at reservoir conditions. , 2015, Environmental science & technology.

[56]  D. Wildenschild,et al.  X-ray imaging and analysis techniques for quantifying pore-scale structure and processes in subsurface porous medium systems , 2013 .

[57]  Baochang Liu,et al.  Characterization of the oil shale products derived via topochemical reaction method , 2014 .

[58]  Jean-Michel Morel,et al.  A non-local algorithm for image denoising , 2005, 2005 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR'05).

[59]  O. K. Mahabadi,et al.  A novel approach for micro‐scale characterization and modeling of geomaterials incorporating actual material heterogeneity , 2012 .

[60]  Jamal M. Nazzal,et al.  Influence of heating rate on the pyrolysis of Jordan oil shale , 2002 .

[61]  Milind Deo,et al.  Characterization of oil shale pore structure before and after pyrolysis by using X-ray micro CT , 2013 .

[62]  James G. Speight,et al.  Handbook of Alternative Fuel Technologies , 2007 .

[63]  Paul Meakin,et al.  A 4D Synchrotron X-Ray-Tomography Study of the Formation of Hydrocarbon- Migration Pathways in Heated Organic-Rich Shale , 2013 .

[64]  T. Fletcher,et al.  Characterization of Macromolecular Structure Elements from a Green River Oil Shale, I. Extracts , 2014 .

[65]  Veerle Cnudde,et al.  High-resolution X-ray computed tomography in geosciences: A review of the current technology and applications , 2013 .

[66]  Tapan Mukerji,et al.  Digital rock physics benchmarks - Part I: Imaging and segmentation , 2013, Comput. Geosci..