{"id":{"repo_id":"colo-mines","oai_identifier":"oai:repository.mines.edu:11124/179264"},"canonical_url":"https://search.dev.ndltd.org/etd/colo-mines/oai:repository.mines.edu:11124/179264","repository":{"repo_id":"colo-mines","name":"Colorado School of Mines","base_url":"https://repository.mines.edu/server/oai/request"},"display":{"title":"Biogenic gas occurrence in the Niobrara Formation, eastern Denver Basin, Colorado, USA","abstract":"Natural gas is one of the most important energy resources around the world. This natural gas can be separated into two origins: thermogenic and biogenic. Thermogenic gas is the most common worldwide, accounting for 85 percent of conventional gas reserves, the remaining natural gas reserves have a biogenic origin. One of the most famous biogenic gas fields is the Beecher Island field, which produces biogenic gas from the Niobrara Formation in the eastern part of the Denver Basin. The petroleum system of the biogenic play in the eastern part of the Denver Basin is a proven system. The maturity data are from high TOC marl intervals in the Niobrara Formation and overlying shale from Sharon Springs Member of the Pierre Shale. The A Chalk of the Niobrara Formation is considered as a reservoir for this play. This reservoir has high porosity but low permeability and is comprised of chalk-rich fecal pellets and planktonic foraminifera. The structure in the eastern part of the Denver Basin is a gentle dipping bed to the west. However, some areas have a small structural closure and biogenic gas accumulation in high structures related to Permian salt dissolution. The great thickness of the impermeable Sharon Springs shale layer covers all of Niobrara Formation as a regional seal and makes the structural trap type in the eastern part of the Denver Basin a successful play. As discussed above, most of the petroleum system elements of biogenic gas play in the eastern part of the Denver Basin were analyzed and defined. However, there is still room for improvement and an unknown factor that will help unlock the petroleum potential in this area.","abstract_html":"Natural gas is one of the most important energy resources around the world. This natural gas can be separated into two origins: thermogenic and biogenic. Thermogenic gas is the most common worldwide, accounting for 85 percent of conventional gas reserves, the remaining natural gas reserves have a biogenic origin. One of the most famous biogenic gas fields is the Beecher Island field, which produces biogenic gas from the Niobrara Formation in the eastern part of the Denver Basin. The petroleum system of the biogenic play in the eastern part of the Denver Basin is a proven system. The maturity data are from high TOC marl intervals in the Niobrara Formation and overlying shale from Sharon Springs Member of the Pierre Shale. The A Chalk of the Niobrara Formation is considered as a reservoir for this play. This reservoir has high porosity but low permeability and is comprised of chalk-rich fecal pellets and planktonic foraminifera. The structure in the eastern part of the Denver Basin is a gentle dipping bed to the west. However, some areas have a small structural closure and biogenic gas accumulation in high structures related to Permian salt dissolution. The great thickness of the impermeable Sharon Springs shale layer covers all of Niobrara Formation as a regional seal and makes the structural trap type in the eastern part of the Denver Basin a successful play. As discussed above, most of the petroleum system elements of biogenic gas play in the eastern part of the Denver Basin were analyzed and defined. However, there is still room for improvement and an unknown factor that will help unlock the petroleum potential in this area.","abstract_has_math":false,"creators":["Imurai, Wittaya"],"institution":"Colorado School of Mines. Arthur Lakes Library","degree_name":"Master of Science (M.S.)","degree_level":"Masters","degree_discipline":"Geology and Geological Engineering","degree_department":null,"school":null,"contributors":[],"advisors":["Sonnenberg, Stephen A."],"committee_chairs":[],"committee_members":["French, Marsha","Trudgill, Bruce, 1964-"],"year":2024,"date_issued":"2024","date_published":"2024","updated_at":"2026-07-24T01:41:37Z","subjects":[],"languages":["eng","English"],"rights":["Copyright of the original work is retained by the author."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["T 9762"],"render_values":[{"text":"T 9762","href":null,"code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/11124/179264","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Sonnenberg, Stephen A."]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["French, Marsha","Trudgill, Bruce, 1964-"]},{"key":"dc:creator","label":"Author","values":["Imurai, Wittaya"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-01-28T20:49:29Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-01-28T20:49:29Z"]},{"key":"dc:date.issued","label":"Date","values":["2024"]},{"key":"dc:publisher","label":"Institution","values":["Colorado School of Mines. 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This natural gas can be separated into two origins: thermogenic and biogenic. Thermogenic gas is the most common worldwide, accounting for 85 percent of conventional gas reserves, the remaining natural gas reserves have a biogenic origin. One of the most famous biogenic gas fields is the Beecher Island field, which produces biogenic gas from the Niobrara Formation in the eastern part of the Denver Basin. The petroleum system of the biogenic play in the eastern part of the Denver Basin is a proven system. The maturity data are from high TOC marl intervals in the Niobrara Formation and overlying shale from Sharon Springs Member of the Pierre Shale. The A Chalk of the Niobrara Formation is considered as a reservoir for this play. This reservoir has high porosity but low permeability and is comprised of chalk-rich fecal pellets and planktonic foraminifera. The structure in the eastern part of the Denver Basin is a gentle dipping bed to the west. However, some areas have a small structural closure and biogenic gas accumulation in high structures related to Permian salt dissolution. The great thickness of the impermeable Sharon Springs shale layer covers all of Niobrara Formation as a regional seal and makes the structural trap type in the eastern part of the Denver Basin a successful play. As discussed above, most of the petroleum system elements of biogenic gas play in the eastern part of the Denver Basin were analyzed and defined. However, there is still room for improvement and an unknown factor that will help unlock the petroleum potential in this area."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["born digital","masters theses"]},{"key":"dc:title","label":"Title","values":["Biogenic gas occurrence in the Niobrara Formation, eastern Denver Basin, Colorado, USA"]}]}],"canonical_facts":{"dc:contributor.advisor":["Sonnenberg, Stephen A."],"dc:contributor.committeemember":["French, Marsha","Trudgill, Bruce, 1964-"],"dc:creator":["Imurai, Wittaya"],"dc:date.accessioned":["2025-01-28T20:49:29Z"],"dc:date.available":["2025-01-28T20:49:29Z"],"dc:date.issued":["2024"],"dc:description":["Includes bibliographical references.","2024 Spring."],"dc:description.abstract":["Natural gas is one of the most important energy resources around the world. This natural gas can be separated into two origins: thermogenic and biogenic. Thermogenic gas is the most common worldwide, accounting for 85 percent of conventional gas reserves, the remaining natural gas reserves have a biogenic origin. One of the most famous biogenic gas fields is the Beecher Island field, which produces biogenic gas from the Niobrara Formation in the eastern part of the Denver Basin. The petroleum system of the biogenic play in the eastern part of the Denver Basin is a proven system. The maturity data are from high TOC marl intervals in the Niobrara Formation and overlying shale from Sharon Springs Member of the Pierre Shale. The A Chalk of the Niobrara Formation is considered as a reservoir for this play. This reservoir has high porosity but low permeability and is comprised of chalk-rich fecal pellets and planktonic foraminifera. The structure in the eastern part of the Denver Basin is a gentle dipping bed to the west. However, some areas have a small structural closure and biogenic gas accumulation in high structures related to Permian salt dissolution. The great thickness of the impermeable Sharon Springs shale layer covers all of Niobrara Formation as a regional seal and makes the structural trap type in the eastern part of the Denver Basin a successful play. As discussed above, most of the petroleum system elements of biogenic gas play in the eastern part of the Denver Basin were analyzed and defined. However, there is still room for improvement and an unknown factor that will help unlock the petroleum potential in this area."],"dc:format.medium":["born digital","masters theses"],"dc:identifier":["IMURAI_mines_0052N_12851.pdf"],"dc:identifier.other":["T 9762"],"dc:identifier.uri":["https://hdl.handle.net/11124/179264"],"dc:language":["English"],"dc:language.iso":["eng"],"dc:publisher":["Colorado School of Mines. Arthur Lakes Library"],"dc:rights":["Copyright of the original work is retained by the author."],"dc:title":["Biogenic gas occurrence in the Niobrara Formation, eastern Denver Basin, Colorado, USA"],"dc:type":["Text"],"thesis:degree_discipline":["Geology and Geological Engineering"],"thesis:degree_level":["Masters"],"thesis:degree_name":["Master of Science (M.S.)"],"thesis:institution_name":["Colorado School of Mines"]},"updated_at":"2026-07-24T01:41:37Z"}