Fluid Substitution Based on Fluid Factor Analysis and Patchy Saturation Model in Carbonates: a Case Study in Amudarya Right Bank

PreviousNext No AccessSEG Technical Program Expanded Abstracts 2015Fluid substitution based on fluid factor analysis and Patchy saturation model in carbonates: a case study in Amudarya right bankAuthors: Xu MinghuaYijia Wu*Xiaojun XiongLei WuXu MinghuaGeological Exploration and Development Research institute of chuanqing Drilling Engineering Company limited, CNPCSearch for more papers by this author, Yijia Wu*Geological Exploration and Development Research institute of chuanqing Drilling Engineering Company limited, CNPCSearch for more papers by this author, Xiaojun XiongChengdu University of TechnologySearch for more papers by this author, and Lei WuAmu Darya River Gas Company, CNPCSearch for more papers by this authorhttps://doi.org/10.1190/segam2015-5896730.1 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract According to the diverse mineral types and uneven distribution of fluid phases in the biological reef reservoir from Amudarya right bank, this study proposed an improved approach to fulfill the application of Gassmann's equation in carbonate reservoirs. First, this paper introduced a calculation of equivalent bulk modulus based on fluid analysis during the fluid substitution, which avoided potential difficulties possibly caused by multiple mineral matrixes and low-connected pores in carbonates. Two sets of equations were utilized to calculate fluid factor (f), and by searching the globally optimal solution to minimize the difference between the two solutions, the equivalent bulk modulus of mineral matrix can be effectively obtained, as well as the dry bulk modulus. Then, considering the non-uniform and uneven distribution of fluids in pores, Patchy saturation model was used to acquire the effective saturated bulk modulus, which finally acquired the desired velocity of P-wave and S-wave. After that, according to crossplot analysis, Poisson's ratio was regarded as fluid identifying factor and the threshold value was acquired. The result is consistent with the gas reservoir distribution predicted by pre-stack inversion, which verified the availability and accuracy of this method in this study. Meanwhile, conventional fluid substitution was applied either to be compared, and it turns out that the method proposed here is much better in application. Keywords: carbonate, rock physics, gas, fluidPermalink: https://doi.org/10.1190/segam2015-5896730.1FiguresReferencesRelatedDetails SEG Technical Program Expanded Abstracts 2015ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2015 Pages: 5634 publication data© 2015 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 19 Aug 2015 CITATION INFORMATION Xu Minghua, Yijia Wu*, Xiaojun Xiong, and Lei Wu, (2015), "Fluid substitution based on fluid factor analysis and Patchy saturation model in carbonates: a case study in Amudarya right bank," SEG Technical Program Expanded Abstracts : 3249-3253. https://doi.org/10.1190/segam2015-5896730.1 Plain-Language Summary Keywordscarbonaterock physicsgasfluidPDF DownloadLoading ...