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dc.contributor.authorMews, Kim S.
dc.contributor.authorAlhubail, Mustafa M.
dc.contributor.authorBarati, Reza Gh.
dc.date.accessioned2021-02-17T21:54:38Z
dc.date.available2021-02-17T21:54:38Z
dc.date.issued2019-07-19
dc.identifier.citationKim S. Mews, Mustafa M. Alhubail, Reza Gh. Barati, "A Review of Brittleness Index Correlations for Unconventional Tight and Ultra-Tight Reservoirs", Geological Society of America Abstracts with Programs. Vol. 51, No. 2, doi: 10.1130/abs/2019SC-326962en_US
dc.identifier.urihttp://hdl.handle.net/1808/31438
dc.description.abstractBrittleness is a key parameter in the development of the unconventional shale and tight carbonate reservoirs as it plays a role in the design of the hydraulic fractures as well as the selection of the sweet-spot locations for perforation and fracture initiation. The brittleness index (BI) is utilized to indicate if the formation rocks are brittle, which are preferable to form a complex network of fractures, or ductile, which are occasionally desirable to seal the fractures from growing. However, there is a wide variety of BI methods in the literature that lead to inconclusive BI values. The Mineral-based brittleness index (MBI), which is a method based on the mineral composition of the formation, can be derived from mineral well logging data or laboratory core testing. Another approach in describing the brittleness is the Fracability Index (FI), which is a combination of Young’s modulus and Poisson’s ratio. Differentiation is also made between the dynamic FI, which is calculated from well logging data, and the static FI, which is derived from laboratory core testing such as uniaxial compressive strength, Brazilian tensile strength and triaxial testing. Hence, to understand the complexity of the brittleness, it is crucial to consider all dependencies such as the lithology, mineral composition, TOC, porosity, temperature and pressure amongst others. In this work, a comprehensive review and analysis of the existing equations and correlations for the calculation of the MBI and FI was conducted. These methods were applied on different low porosity and low permeability rocks. A thorough comparison has also been conducted between the MBI and FI correlations as well as between the dynamic FI and the static FI to ultimately clarify and improve the definition of brittleness as a function of lithology. High content of quartz and carbonates result in high values of MBI, and high Young’s modulus values yield high FI values. On the other hand, high clay content and high porosity lead to low MBI values.en_US
dc.publisherMDPIen_US
dc.rights© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).en_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.subjectRock brittlenessen_US
dc.subjectHydraulic fracturingen_US
dc.subjectUnconventional reservoirsen_US
dc.subjectBrittleness indexen_US
dc.subjectFracability indexen_US
dc.subjectYoung’s modulusen_US
dc.subjectPoisson’s ratioen_US
dc.subjectMarcellus Formationen_US
dc.subjectBakken Formationen_US
dc.subjectNiobrara Formationen_US
dc.subjectChattanooga shaleen_US
dc.titleA Review of Brittleness Index Correlations for Unconventional Tight and Ultra-Tight Reservoirsen_US
dc.typeArticleen_US
kusw.kuauthorMews, Kim S.
kusw.kuauthorAlhubail, Mustafa M.
kusw.kuauthorBarati, Reza Gh.
kusw.kudepartmentGeologyen_US
kusw.kudepartmentChemical and Petroleum Engineeringen_US
dc.identifier.doi10.1130/abs/2019SC-326962en_US
kusw.oaversionScholarly/refereed, publisher versionen_US
kusw.oapolicyThis item meets KU Open Access policy criteria.en_US
dc.rights.accessrightsopenAccessen_US


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© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Except where otherwise noted, this item's license is described as: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).