{"674850":{"#nid":"674850","#data":{"type":"event","title":"PhD Defense by Mengwei Liu","body":[{"value":"\u003Cp\u003ESchool of Civil and Environmental Engineering\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EPh.D. Thesis Defense Announcement\u003C\/strong\u003E\u003C\/p\u003E\u003Cp\u003ECLAY-DOMINANT GEOMATERIALS: FROM SUSPENSIONS TO SHALES\u003C\/p\u003E\u003Cp\u003E- IMPLICATIONS TO LONG-TERM GAS STORAGE -\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EBy\u0026nbsp;\u003C\/strong\u003EMengwei Liu\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003EAdvisor\u003C\/strong\u003E:\u003Cstrong\u003E\u0026nbsp;\u003C\/strong\u003EDr. J. Carlos Santamarina (CEE)\u003C\/p\u003E\u003Cp\u003E\u003Cstrong\u003ECommittee Members:\u0026nbsp; \u003C\/strong\u003EDr. J. David Frost (CEE), Dr. Susan E. Burns (CEE),\u003C\/p\u003E\u003Cp\u003EDr. Angel Palomino (UTK), Dr. Anne-Catherine Dieudonne (TU Delft)\u003C\/p\u003E\u003Cp\u003EDate and Time:\u003Cstrong\u003E\u0026nbsp; \u003C\/strong\u003EJune 10, 2024.\u0026nbsp; 10 AM EST\u003C\/p\u003E\u003Cp\u003ELocation:\u0026nbsp;Mason 2119 \u2502Virtual link: \u003Ca href=\u0022https:\/\/gatech.zoom.us\/j\/93952033468\u0022\u003Ehttps:\/\/gatech.zoom.us\/j\/93952033468\u003C\/a\u003E\u003C\/p\u003E\u003Cp\u003EClays are the submicron-to-micron sized phyllosilicate minerals commonly found in\u003Cbr\u003Ethe form of fine-grained sediments and rocks. This thesis investigates claydominant\u003Cbr\u003Egeomaterials at two extreme conditions: genesis at near-zero effective\u003Cbr\u003Estress (fabric formation from clay suspensions and early sediment evolution), and\u003Cbr\u003Ehigh effective stress (sealing properties and discontinuities). During genesis,\u003Cbr\u003Emultiple concurrent processes determine the stability of clay suspensions in\u003Cbr\u003Eotherwise quiescent stratified water bodies. Geophysical monitoring minimizes\u003Cbr\u003Edisturbance; the interlayer transition zone acts as a high-pass filter that\u003Cbr\u003Epreferentially reflects low-frequency long-wavelength P-waves. Multi-scale and\u003Cbr\u003Emulti-physics experiments and complementary analyses elucidate underlying\u003Cbr\u003Eprocesses, such as: aggregation, diffusiophoresis, constrained ion diffusion, graindisplacive\u003Cbr\u003Ebubble formation, capillary jamming, osmotic swelling, and double-layer\u003Cbr\u003Eeffects. At high effective stress, shales exhibit a complex pore topology defined by the coexistence of clay tactoids, silicates, carbonates, and mature organic matter.\u003Cbr\u003EThe Hagen-Poiseuille model combines with a fractal pore structure to predict the\u003Cbr\u003Eevolution of hydraulic conductivity with burial. Discontinuities in tectonically\u003Cbr\u003Edisturbed shale layers hinder their seal capacity; we advance and test an innovative\u003Cbr\u003Esealing solution based on precipitation reactions, where solutions include ethanol\u003Cbr\u003Eto drive the migration of injected fluids towards the discontinuities in the caprock.\u003Cbr\u003EExperimental results and complementary numerical simulations show the evolution\u003Cbr\u003Eof sealing through multiple injection sequences. Together, these investigations\u003Cbr\u003Eprovide a new understanding of clay-dominant geomaterials, from the atomic scale\u003Cbr\u003Eto field-scale environmental and energy systems.\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003ECLAY-DOMINANT GEOMATERIALS: FROM SUSPENSIONS TO SHALES\u003C\/p\u003E\u003Cp\u003E- IMPLICATIONS TO LONG-TERM GAS STORAGE\u0026nbsp;\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"CLAY-DOMINANT GEOMATERIALS: FROM SUSPENSIONS TO SHALES - IMPLICATIONS TO LONG-TERM GAS STORAGE "}],"uid":"27707","created_gmt":"2024-05-22 15:49:38","changed_gmt":"2024-05-22 15:50:09","author":"Tatianna Richardson","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2024-06-10T10:00:00-04:00","event_time_end":"2024-06-10T12:00:00-04:00","event_time_end_last":"2024-06-10T12:00:00-04:00","gmt_time_start":"2024-06-10 14:00:00","gmt_time_end":"2024-06-10 16:00:00","gmt_time_end_last":"2024-06-10 16:00:00","rrule":null,"timezone":"America\/New_York"},"location":"Mason 2119 \u2502Virtual link","extras":[],"groups":[{"id":"221981","name":"Graduate Studies"}],"categories":[],"keywords":[{"id":"100811","name":"Phd Defense"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[{"id":"1788","name":"Other\/Miscellaneous"}],"invited_audience":[{"id":"78771","name":"Public"}],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}