Seismic inversion parameters adaptation to refine petrophysical model
https://doi.org/10.51890/2587-7399-2024-9-1-21-31
Abstract
Introduction. Seismic inversion corresponds to ill-posed problems with multiple solutions, e.g. suitable geological models. To evaluate it, data regularization is required, i.e. adding more information in the input data to obtain evaluation criteria.
Aim. The main aim of project is testing & approbation of different regularization algorithms of more appropriate elastic properties evaluation & saturation forecast, depending on input seismic data as well as geological properties.
Materials and methods. Prior to regularization realization during inversion, an experiment based on synthetic model having different noise level and thicknesses & frequencies was provided in order to choose an appropriate regularization algorithm. To check the assumptions made on synthetic model, different regularization algorithms were tested on real data — case studies from Eastern Siberian and Northern Sea oil & gas fields.
Results. Upon the experiment a matrix of solutions was suggested in terms of appropriate regularization algorithm usage depending on input seismic & geology data. Qualitatively, porosity estimation accuracy upon regularization seems to be about 10-15% higher than base case inversion. Furthermore, regularization of simultaneous inversion results allows identification of possible hydrocarbon-saturated zones at more appropriate level.
Conclusion. Case studies from Eastern Siberian and Northern Sea oil & gas fields have shown that regularized inversion allows obtaining more geologically-justified trends in terms of porosity modeling as well as possible hydrocarbon-saturated zones identification by Poisson’s ratio anomalies. This fact leads to risks decrease during reserves estimation.
About the Authors
I. A. Perepletkin
Novosibirsk State University ; Gazprom neft companу group
Russian Federation
Russian Federation
Ivan A. Perepletkin — Engineer
Scopus: 57205282863
2, Pirogov Str., 630090, Novosibirsk
A. V. Butorin
Gazprom neft companу group ; Saint Petersburg State University
Russian Federation
Russian Federation
Aleksandr V. Butorin — Сand. Sci. (Geol.-Min.), Associate Professor, Institute of Earth Sciences
AuthorID: 877389 Web of Science: B-7405-2019 Scopus: 56370048400
Saint Petersburg
A. A. Volkova
Tomsk Polytechnic University
Russian Federation
Russian Federation
Aleksandra A. Volkova — Engineer of Petroleum Geology Laboratory
AuthorID: 924262 Scopus: 57189495004
4a Usov Str., 634034, Tomsk
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Review
For citations:
Perepletkin I.A., Butorin A.V., Volkova A.A. Seismic inversion parameters adaptation to refine petrophysical model. PROneft. Professionally about Oil. 2024;9(1):21-31. (In Russ.) https://doi.org/10.51890/2587-7399-2024-9-1-21-31
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