Effective elastic properties for 3D real fractures based on finite-element modeling

PreviousNext No AccessSEG 2021 Workshop: 4th International Workshop on Mathematical Geophysics: Traditional & Learning, Virtual, 17–19 December 2021Effective elastic properties for 3D real fractures based on finite-element modelingAuthors: Jian ShikaiFu LiYunZhou YuxuanCao XinxinCui LijieJian ShikaiShandong Provincial Key Laboratory of Deep Oil and GasChina University of Petroleum (East China)Search for more papers by this author, Fu LiYunShandong Provincial Key Laboratory of Deep Oil and GasChina University of Petroleum (East China)Search for more papers by this author, Zhou YuxuanChengdu University of TechnologySearch for more papers by this author, Cao XinxinChina University of Petroleum (East China)Search for more papers by this author, and Cui LijieShandong Provincial Key Laboratory of Deep Oil and GasChina University of Petroleum (East China)Search for more papers by this authorhttps://doi.org/10.1190/iwmg2021-30.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Real fractures are usually multiscale in orientations, sizes, and distributions, resulting in complex anisotropic characteristics. Analytical methods for effective elastic properties are based on some assumptions, such as dilute fracture concentration and regular-shaped fractures, which do not occur in actual reservoirs. Here, anisotropic finite-element modeling of effective elastic properties is conducted for complex fractured rocks by a least-squares fitting procedure. The algorithm is extended to 3D cases and validated by classical effective medium theories for models with different fracture densities. The results agree well with the theoretical predictions at low fracture density. The model also considers the interactions among fractures to calculate equivalent stiffness tensors at high fracture density. We applied the 3D algorithm to real fractures built from a natural outcrop, and we found that the fracturing pattern significantly affects the effective anisotropy properties. The resultant P-wave phase velocities as functions of the incidence angle and frequencies are anisotropic. This study provides a great potential to calculate equivalent stiffness tensors of 3D natural fractures. Keywords: elastic, 3D, anisotropy, fractures, finite element Permalink: https://doi.org/10.1190/iwmg2021-30.1FiguresReferencesRelatedDetails SEG 2021 Workshop: 4th International Workshop on Mathematical Geophysics: Traditional & Learning, Virtual, 17–19 December 2021ISSN (online):2159-6832Copyright: 2022 Pages: 193 publication data© 2022 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished: 24 Feb 2022 CITATION INFORMATION Jian Shikai, Fu LiYun, Zhou Yuxuan, Cao Xinxin, and Cui Lijie, (2022), "Effective elastic properties for 3D real fractures based on finite-element modeling," SEG Global Meeting Abstracts : 116-118. https://doi.org/10.1190/iwmg2021-30.1 Plain-Language Summary Keywordselastic3Danisotropyfracturesfinite element PDF DownloadLoading ...