Compositional controls on nanopore structure in different shale lithofacies: A comparison with pure clays and isolated kerogens
•Shale lithofacies are identified as 12 types based on clay content and TOC criteria.•Compared to mixed lithofacies, argillaceous OM-rich shales have larger specific surface area (SSA) and pore volume (PV) in the full range of pore sizes.•Clay components in shales mainly contribute to the pore volum...
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| Veröffentlicht in: | Fuel (Guildford) 2021-11, Vol.303, p.121079, Article 121079 |
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| creator | Yuan, Yujie Rezaee, Reza Yu, Hongyan Zou, Jie Liu, Kouqi Zhang, Yihuai |
| description | •Shale lithofacies are identified as 12 types based on clay content and TOC criteria.•Compared to mixed lithofacies, argillaceous OM-rich shales have larger specific surface area (SSA) and pore volume (PV) in the full range of pore sizes.•Clay components in shales mainly contribute to the pore volume of mesopores ranging from 2 to 17 nm.•OM components in shales mainly contribute to the SSA of micropores 2% and illite-dominated clay contents > 50%) develop more interconnected pores with better hydrocarbon storage potential. The argillaceous lithofacies have large amounts of cleavage-sheet pores with large pore volumes; the accumulative pore volume of the pores in diameter from 2 to 17 nm constitutes the major amount of total pore volume that is associated with free gas. The OM-rich lithofacies develop more OM-pores (particularly in pore diameter |
| doi_str_mv | 10.1016/j.fuel.2021.121079 |
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Nanopore structure development in shale is intimated with lithofacies that demonstrates a large variety in different formations. It is critical to differentiate and quantify the separate impact of lithological components (minerals and organic matter (OM)) on pore structure attributes associated with shale gas storage capacity. In this study, we classified shales into 12 lithofacies for compositional and petrophysical quantification. Parameters of our main target, the Goldwyer shales (argillaceous OM-poor, argillaceous OM-moderate, and argillaceous OM-rich lithofacies) were further compared with other shale lithofacies, pure clays and isolated kerogens, using XRD, Rock-Eval pyrolysis, Ar-SEM and low-pressure CO2/N2 gas adsorption techniques. Results show that argillaceous OM-rich lithofacies (TOC > 2% and illite-dominated clay contents > 50%) develop more interconnected pores with better hydrocarbon storage potential. The argillaceous lithofacies have large amounts of cleavage-sheet pores with large pore volumes; the accumulative pore volume of the pores in diameter from 2 to 17 nm constitutes the major amount of total pore volume that is associated with free gas. The OM-rich lithofacies develop more OM-pores (particularly in pore diameter <2 nm) that contain extraordinarily high specific surface area (SSA); the SSA of micropores makes up the major total surface area that is intimated with adsorbed gas. Further investigation on pure clays and isolated kerogens clarifies that illite mainly controls the pore sizes from 2 to 17 nm, resulting in large pore volumes in argillaceous shales. By contrast, isolated kerogen dominantly controls micropores in diameter <2 nm, leading to a larger surface area with higher adsorbed gas storage in organic-rich shales.</description><identifier>ISSN: 0016-2361</identifier><identifier>EISSN: 1873-7153</identifier><identifier>DOI: 10.1016/j.fuel.2021.121079</identifier><language>eng</language><publisher>Kidlington: Elsevier Ltd</publisher><subject>Carbon dioxide ; Clay ; Clay minerals ; Illite ; Isolated kerogen ; Kerogen ; Lithofacies ; Low pressure ; Minerals ; Organic matter ; Pore structure ; Pores ; Pyrolysis ; Shale ; Shale gas ; Shales ; Storage capacity ; Surface area</subject><ispartof>Fuel (Guildford), 2021-11, Vol.303, p.121079, Article 121079</ispartof><rights>2021 Elsevier Ltd</rights><rights>Copyright Elsevier BV Nov 1, 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c328t-38e6fc8e905560c0a866e9cf1bb164755678c1ae8d4889f0ed5051853633e0733</citedby><cites>FETCH-LOGICAL-c328t-38e6fc8e905560c0a866e9cf1bb164755678c1ae8d4889f0ed5051853633e0733</cites><orcidid>0000-0001-5471-3450</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.fuel.2021.121079$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Yuan, Yujie</creatorcontrib><creatorcontrib>Rezaee, Reza</creatorcontrib><creatorcontrib>Yu, Hongyan</creatorcontrib><creatorcontrib>Zou, Jie</creatorcontrib><creatorcontrib>Liu, Kouqi</creatorcontrib><creatorcontrib>Zhang, Yihuai</creatorcontrib><title>Compositional controls on nanopore structure in different shale lithofacies: A comparison with pure clays and isolated kerogens</title><title>Fuel (Guildford)</title><description>•Shale lithofacies are identified as 12 types based on clay content and TOC criteria.•Compared to mixed lithofacies, argillaceous OM-rich shales have larger specific surface area (SSA) and pore volume (PV) in the full range of pore sizes.•Clay components in shales mainly contribute to the pore volume of mesopores ranging from 2 to 17 nm.•OM components in shales mainly contribute to the SSA of micropores <2 nm that is intimated with adsorbed gas.
Nanopore structure development in shale is intimated with lithofacies that demonstrates a large variety in different formations. It is critical to differentiate and quantify the separate impact of lithological components (minerals and organic matter (OM)) on pore structure attributes associated with shale gas storage capacity. In this study, we classified shales into 12 lithofacies for compositional and petrophysical quantification. Parameters of our main target, the Goldwyer shales (argillaceous OM-poor, argillaceous OM-moderate, and argillaceous OM-rich lithofacies) were further compared with other shale lithofacies, pure clays and isolated kerogens, using XRD, Rock-Eval pyrolysis, Ar-SEM and low-pressure CO2/N2 gas adsorption techniques. Results show that argillaceous OM-rich lithofacies (TOC > 2% and illite-dominated clay contents > 50%) develop more interconnected pores with better hydrocarbon storage potential. The argillaceous lithofacies have large amounts of cleavage-sheet pores with large pore volumes; the accumulative pore volume of the pores in diameter from 2 to 17 nm constitutes the major amount of total pore volume that is associated with free gas. The OM-rich lithofacies develop more OM-pores (particularly in pore diameter <2 nm) that contain extraordinarily high specific surface area (SSA); the SSA of micropores makes up the major total surface area that is intimated with adsorbed gas. Further investigation on pure clays and isolated kerogens clarifies that illite mainly controls the pore sizes from 2 to 17 nm, resulting in large pore volumes in argillaceous shales. By contrast, isolated kerogen dominantly controls micropores in diameter <2 nm, leading to a larger surface area with higher adsorbed gas storage in organic-rich shales.</description><subject>Carbon dioxide</subject><subject>Clay</subject><subject>Clay minerals</subject><subject>Illite</subject><subject>Isolated kerogen</subject><subject>Kerogen</subject><subject>Lithofacies</subject><subject>Low pressure</subject><subject>Minerals</subject><subject>Organic matter</subject><subject>Pore structure</subject><subject>Pores</subject><subject>Pyrolysis</subject><subject>Shale</subject><subject>Shale gas</subject><subject>Shales</subject><subject>Storage capacity</subject><subject>Surface area</subject><issn>0016-2361</issn><issn>1873-7153</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp9kE1PxCAQhonRxHX1D3gi8dwVSktZ48Vs_Eo28aJnwtLBpXahAtXsyb8uzXr2xIR5n8nMg9AlJQtKKL_uFmaEflGSki5oSUmzPEIzKhpWNLRmx2hGcqooGaen6CzGjhDSiLqaoZ-V3w0-2mS9Uz3W3qXg-4i9w045P_gAOKYw6jTmyjrcWmMggEs4blUPuLdp643SFuINvssDdoMKNmb-O3fwMGG6V_uIlWtxbvQqQYs_IPh3cPEcnRjVR7j4e-fo7eH-dfVUrF8en1d360KzUqSCCeBGC1iSuuZEEyU4h6U2dLOhvGryZyM0VSDaSoilIdDWpKaiZpwxIA1jc3R1mDsE_zlCTLLzY8gnR1nWma8o4SKnykNKBx9jACOHYHcq7CUlchItOzmJlpNoeRCdodsDBHn_LwtBxmzDaWhtAJ1k6-1_-C_jpIiT</recordid><startdate>20211101</startdate><enddate>20211101</enddate><creator>Yuan, Yujie</creator><creator>Rezaee, Reza</creator><creator>Yu, Hongyan</creator><creator>Zou, Jie</creator><creator>Liu, Kouqi</creator><creator>Zhang, Yihuai</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7QO</scope><scope>7QQ</scope><scope>7SC</scope><scope>7SE</scope><scope>7SP</scope><scope>7SR</scope><scope>7T7</scope><scope>7TA</scope><scope>7TB</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>C1K</scope><scope>F28</scope><scope>FR3</scope><scope>H8D</scope><scope>H8G</scope><scope>JG9</scope><scope>JQ2</scope><scope>KR7</scope><scope>L7M</scope><scope>L~C</scope><scope>L~D</scope><scope>P64</scope><orcidid>https://orcid.org/0000-0001-5471-3450</orcidid></search><sort><creationdate>20211101</creationdate><title>Compositional controls on nanopore structure in different shale lithofacies: A comparison with pure clays and isolated kerogens</title><author>Yuan, Yujie ; Rezaee, Reza ; Yu, Hongyan ; Zou, Jie ; Liu, Kouqi ; Zhang, Yihuai</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c328t-38e6fc8e905560c0a866e9cf1bb164755678c1ae8d4889f0ed5051853633e0733</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Carbon dioxide</topic><topic>Clay</topic><topic>Clay minerals</topic><topic>Illite</topic><topic>Isolated kerogen</topic><topic>Kerogen</topic><topic>Lithofacies</topic><topic>Low pressure</topic><topic>Minerals</topic><topic>Organic matter</topic><topic>Pore structure</topic><topic>Pores</topic><topic>Pyrolysis</topic><topic>Shale</topic><topic>Shale gas</topic><topic>Shales</topic><topic>Storage capacity</topic><topic>Surface area</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yuan, Yujie</creatorcontrib><creatorcontrib>Rezaee, Reza</creatorcontrib><creatorcontrib>Yu, Hongyan</creatorcontrib><creatorcontrib>Zou, Jie</creatorcontrib><creatorcontrib>Liu, Kouqi</creatorcontrib><creatorcontrib>Zhang, Yihuai</creatorcontrib><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>Biotechnology Research Abstracts</collection><collection>Ceramic Abstracts</collection><collection>Computer and Information Systems Abstracts</collection><collection>Corrosion Abstracts</collection><collection>Electronics & Communications Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Materials Business File</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Copper Technical Reference Library</collection><collection>Materials Research Database</collection><collection>ProQuest Computer Science Collection</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Computer and Information Systems Abstracts Academic</collection><collection>Computer and Information Systems Abstracts Professional</collection><collection>Biotechnology and BioEngineering Abstracts</collection><jtitle>Fuel (Guildford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Yuan, Yujie</au><au>Rezaee, Reza</au><au>Yu, Hongyan</au><au>Zou, Jie</au><au>Liu, Kouqi</au><au>Zhang, Yihuai</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Compositional controls on nanopore structure in different shale lithofacies: A comparison with pure clays and isolated kerogens</atitle><jtitle>Fuel (Guildford)</jtitle><date>2021-11-01</date><risdate>2021</risdate><volume>303</volume><spage>121079</spage><pages>121079-</pages><artnum>121079</artnum><issn>0016-2361</issn><eissn>1873-7153</eissn><abstract>•Shale lithofacies are identified as 12 types based on clay content and TOC criteria.•Compared to mixed lithofacies, argillaceous OM-rich shales have larger specific surface area (SSA) and pore volume (PV) in the full range of pore sizes.•Clay components in shales mainly contribute to the pore volume of mesopores ranging from 2 to 17 nm.•OM components in shales mainly contribute to the SSA of micropores <2 nm that is intimated with adsorbed gas.
Nanopore structure development in shale is intimated with lithofacies that demonstrates a large variety in different formations. It is critical to differentiate and quantify the separate impact of lithological components (minerals and organic matter (OM)) on pore structure attributes associated with shale gas storage capacity. In this study, we classified shales into 12 lithofacies for compositional and petrophysical quantification. Parameters of our main target, the Goldwyer shales (argillaceous OM-poor, argillaceous OM-moderate, and argillaceous OM-rich lithofacies) were further compared with other shale lithofacies, pure clays and isolated kerogens, using XRD, Rock-Eval pyrolysis, Ar-SEM and low-pressure CO2/N2 gas adsorption techniques. Results show that argillaceous OM-rich lithofacies (TOC > 2% and illite-dominated clay contents > 50%) develop more interconnected pores with better hydrocarbon storage potential. The argillaceous lithofacies have large amounts of cleavage-sheet pores with large pore volumes; the accumulative pore volume of the pores in diameter from 2 to 17 nm constitutes the major amount of total pore volume that is associated with free gas. The OM-rich lithofacies develop more OM-pores (particularly in pore diameter <2 nm) that contain extraordinarily high specific surface area (SSA); the SSA of micropores makes up the major total surface area that is intimated with adsorbed gas. Further investigation on pure clays and isolated kerogens clarifies that illite mainly controls the pore sizes from 2 to 17 nm, resulting in large pore volumes in argillaceous shales. By contrast, isolated kerogen dominantly controls micropores in diameter <2 nm, leading to a larger surface area with higher adsorbed gas storage in organic-rich shales.</abstract><cop>Kidlington</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.fuel.2021.121079</doi><orcidid>https://orcid.org/0000-0001-5471-3450</orcidid></addata></record> |
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| ispartof | Fuel (Guildford), 2021-11, Vol.303, p.121079, Article 121079 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Carbon dioxide Clay Clay minerals Illite Isolated kerogen Kerogen Lithofacies Low pressure Minerals Organic matter Pore structure Pores Pyrolysis Shale Shale gas Shales Storage capacity Surface area |
| title | Compositional controls on nanopore structure in different shale lithofacies: A comparison with pure clays and isolated kerogens |
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