Aaron M. Jubb Ryan J. McAleer Brett J. Valentine Justin E. Birdwell Paul C. Hackley 2021 <div id="abstracts" class="Abstracts u-font-serif"><div id="ab0005" class="abstract author" lang="en"><div id="as0005"><p id="sp0200"><span>This review examines new techniques and applications of organic&nbsp;petrography&nbsp;in source-rock reservoir&nbsp;petroleum systems&nbsp;that have occurred along with development of the global ‘shale revolution’ in energy resources. The review is limited to techniques and instrumentation that provide spatially resolved information, typically at or below&nbsp;microscales, for dispersed organic matter occurring&nbsp;</span><i>in situ</i><span>&nbsp;in samples of shale and&nbsp;mudrock. A brief summary of&nbsp;ion beam&nbsp;sample preparation is followed by discussion of the most common analytical techniques and applications. Advantages and limitations of each technique, including requisite sample preparation, types of information generated [e.g., molecular or elemental (isotopic) abundance], sensitivity, and resolution are discussed. In a few cases, techniques not yet applied to&nbsp;organic petrology&nbsp;of shale or mudrock are described (e.g., X-ray photoelectron spectroscopy imaging), in anticipation of near-term future application. The most common&nbsp;</span><i>in situ</i><span>&nbsp;techniques applied for characterization of organic matter in shale and mudrock include optical (including fluorescence) and&nbsp;electron microscopies, Raman, fluorescence, and infrared&nbsp;spectroscopies, and surficial measurements via force microscopy. Techniques that show growing application to organic petrography of shale include tip-enhanced photothermal infrared spectroscopy,&nbsp;mass spectrometry&nbsp;imaging, and synchrotron-based spectroscopies, among others. It is anticipated that the future of dispersed organic matter petrography will hold continued development of integrated instrument techniques (e.g., simultaneous or sequential correlative microscopies and/or spectroscopies of the same location), increased instrumental resolution, increased use of multiscale and multimodal organic petrography investigations, and three-dimensional imaging and&nbsp;chemical speciation&nbsp;mapping applications via multiple analytical approaches.</span></p></div></div></div> application/pdf 10.1016/j.coal.2021.103745 en Elsevier A review of spatially resolved techniques and applications of organic petrography in shale petroleum systems article