Two-stage rock-physics modeling of the elastic properties of organic-rich shales

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2016Two-stage rock-physics modeling of the elastic properties of organic-rich shalesAuthors: Liqin SangYuefeng SunLiqin SangTexas A&M UniversitySearch for more papers by this author and Yuefeng SunTexas A&M UniversitySearch for more papers by this authorhttps://doi.org/10.1190/segam2016-13872087.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Velocity-porosity relationship for organic-rich shales is largely affected by kerogen content. A two-stage rock physics model is proposed to describe the elastic properties of these formations. The model considers the large modulus contrast between soft (kerogen) and stiff matrix minerals in addition to the structural effect of kerogen-occupied space on total matrix properties. In the first stage, we introduce “kerogen space” to the original solid matrix, saturate the solid rock frame with kerogen, and calculate the effective moduli of the kerogen-saturated total matrix composed of kerogen and other stiff minerals. In the second stage, we incorporate porosity into the kerogen-saturated total matrix, saturate the kerogen-bearing total rock frame with pore fluids (hydrocarbon and/or water), and evaluate the effective moduli of the fluid-saturated rock. The two-stage model is applied to an organic-rich shale formation from the Permian Basin with kerogen volume of 0-0.1(v/v). The estimated moduli of the total matrix composed of kerogen and other stiff minerals are reported and comparisons are made with the Voigt-Reuss-Hill (VRH) model. Results suggest that the relative difference in estimates of the total matrix moduli between the VRH model and the two-stage model can be as much as 8% for shear modulus and 24% for bulk modulus respectively, for a modulus ratio of 0.07-0.08 between kerogen and other stiff minerals. Presentation Date: Tuesday, October 18, 2016 Start Time: 8:25:00 AM Location: 167 Presentation Type: ORAL Keywords: acoustic, elastic, rock physics, shale gas, velocityPermalink: https://doi.org/10.1190/segam2016-13872087.1FiguresReferencesRelatedDetailsCited byTwo-parameter prestack seismic inversion of porosity and pore structure parameter of fractured carbonate reservoirs: Part 1 — MethodsTingting Zhang and Yuefeng Sun25 October 2018 | Interpretation, Vol. 6, No. 4 SEG Technical Program Expanded Abstracts 2016ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2016 Pages: 5654 publication data© 2016 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 01 Sep 2016 CITATION INFORMATION Liqin Sang and Yuefeng Sun, (2016), "Two-stage rock-physics modeling of the elastic properties of organic-rich shales," SEG Technical Program Expanded Abstracts : 3164-3168. https://doi.org/10.1190/segam2016-13872087.1 Plain-Language Summary Keywordsacousticelasticrock physicsshale gasvelocityPDF DownloadLoading ...