{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/97511"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/97511","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Monitoring microseismic activity in core samples encased in core flooding apparatus subjected to confining and pore pressures","abstract":"Geological sequestration of CO2 is considered as one of the most promising technologies to mitigate global warming. The process of CO2 injection and storage in the porous sandstones, however, may be accompanied with an increase in microseismic activity. In order to better understand the causes of microseismic events detected during and after CO2 injection, a sensitive, reliable and consistent data acquisition system was developed in the present study for monitoring microseismic (acoustic emission or AE) events emanating from rock samples tested in the core flooding apparatus at the Illinois State Geological Survey (ISGS) laboratory. Several types of sandstone and PVC core samples with various treatments were prepared and evaluated. These samples were subjected to loading/unloading patterns of confining and pore pressures, so as to simulate the environment of underground sandstone formations for carbon storage. The detected AE events were synchronized with the applied pressure profiles to show the temporal clustering of events. A simple one-dimensional localization model was built to determine the spatial variations of event source locations along the axis of the core sample. Criteria for noise elimination and for event characterization were proposed. Results were generally satisfactory and repeatable. Very few AE events were detected from solid PVC and sandstone samples. Many more AE events were detected from the fractured samples with visible damage, and the localized event source locations determined by the model were consistent with the induced cracking positions. When the sample was subjected to a combination of confining and pore pressures, AE event clustering was observed when the net pressure, defined as the differential pressure between confining and pore pressures, increased.","abstract_html":"Geological sequestration of CO2 is considered as one of the most promising technologies to mitigate global warming. The process of CO2 injection and storage in the porous sandstones, however, may be accompanied with an increase in microseismic activity. In order to better understand the causes of microseismic events detected during and after CO2 injection, a sensitive, reliable and consistent data acquisition system was developed in the present study for monitoring microseismic (acoustic emission or AE) events emanating from rock samples tested in the core flooding apparatus at the Illinois State Geological Survey (ISGS) laboratory. Several types of sandstone and PVC core samples with various treatments were prepared and evaluated. These samples were subjected to loading/unloading patterns of confining and pore pressures, so as to simulate the environment of underground sandstone formations for carbon storage. The detected AE events were synchronized with the applied pressure profiles to show the temporal clustering of events. A simple one-dimensional localization model was built to determine the spatial variations of event source locations along the axis of the core sample. Criteria for noise elimination and for event characterization were proposed. Results were generally satisfactory and repeatable. Very few AE events were detected from solid PVC and sandstone samples. Many more AE events were detected from the fractured samples with visible damage, and the localized event source locations determined by the model were consistent with the induced cracking positions. When the sample was subjected to a combination of confining and pore pressures, AE event clustering was observed when the net pressure, defined as the differential pressure between confining and pore pressures, increased.","abstract_has_math":false,"creators":["Liu, Xinyang"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Popovics, John S."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-08-10T19:16:21Z","date_published":"2017-08-10T19:16:21Z","updated_at":"2026-07-22T22:24:34Z","subjects":["Microseismicity","Acoustic emission","Geological sequestration"],"languages":["en"],"rights":["Copyright 2017 Xinyang Liu"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/97511","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Popovics, John S."]},{"key":"dc:creator","label":"Author","values":["Liu, Xinyang"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-08-10T19:16:21Z","2017-04-27","2017-05"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Civil Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Microseismicity","Acoustic emission","Geological sequestration"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 Xinyang Liu"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/97511"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Geological sequestration of CO2 is considered as one of the most promising technologies to mitigate global warming. The process of CO2 injection and storage in the porous sandstones, however, may be accompanied with an increase in microseismic activity. In order to better understand the causes of microseismic events detected during and after CO2 injection, a sensitive, reliable and consistent data acquisition system was developed in the present study for monitoring microseismic (acoustic emission or AE) events emanating from rock samples tested in the core flooding apparatus at the Illinois State Geological Survey (ISGS) laboratory. Several types of sandstone and PVC core samples with various treatments were prepared and evaluated. These samples were subjected to loading/unloading patterns of confining and pore pressures, so as to simulate the environment of underground sandstone formations for carbon storage. The detected AE events were synchronized with the applied pressure profiles to show the temporal clustering of events. A simple one-dimensional localization model was built to determine the spatial variations of event source locations along the axis of the core sample. Criteria for noise elimination and for event characterization were proposed. Results were generally satisfactory and repeatable. Very few AE events were detected from solid PVC and sandstone samples. Many more AE events were detected from the fractured samples with visible damage, and the localized event source locations determined by the model were consistent with the induced cracking positions. When the sample was subjected to a combination of confining and pore pressures, AE event clustering was observed when the net pressure, defined as the differential pressure between confining and pore pressures, increased.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-08-10 without embargo terms","The student, Xinyang Liu, accepted the attached license on 2017-04-27 at 15:12.","The student, Xinyang Liu, submitted this Thesis for approval on 2017-04-27 at 15:28.","This Thesis was approved for publication on 2017-04-27 at 17:27.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11123 on 2017-08-10 at 13:47:00","Made available in DSpace on 2017-08-10T19:16:21Z (GMT). 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In order to better understand the causes of microseismic events detected during and after CO2 injection, a sensitive, reliable and consistent data acquisition system was developed in the present study for monitoring microseismic (acoustic emission or AE) events emanating from rock samples tested in the core flooding apparatus at the Illinois State Geological Survey (ISGS) laboratory. Several types of sandstone and PVC core samples with various treatments were prepared and evaluated. These samples were subjected to loading/unloading patterns of confining and pore pressures, so as to simulate the environment of underground sandstone formations for carbon storage. The detected AE events were synchronized with the applied pressure profiles to show the temporal clustering of events. A simple one-dimensional localization model was built to determine the spatial variations of event source locations along the axis of the core sample. Criteria for noise elimination and for event characterization were proposed. Results were generally satisfactory and repeatable. Very few AE events were detected from solid PVC and sandstone samples. Many more AE events were detected from the fractured samples with visible damage, and the localized event source locations determined by the model were consistent with the induced cracking positions. When the sample was subjected to a combination of confining and pore pressures, AE event clustering was observed when the net pressure, defined as the differential pressure between confining and pore pressures, increased.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-08-10 without embargo terms","The student, Xinyang Liu, accepted the attached license on 2017-04-27 at 15:12.","The student, Xinyang Liu, submitted this Thesis for approval on 2017-04-27 at 15:28.","This Thesis was approved for publication on 2017-04-27 at 17:27.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11123 on 2017-08-10 at 13:47:00","Made available in DSpace on 2017-08-10T19:16:21Z (GMT). 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