Abstract
Reservoir irreducible water saturation is one of the critical parameters of well logging interpretation, especially in the low porosity and low permeability sandstone reservoir. It can be used to differentiate oil-water layers and calculate relative permeability and water cut. The analysis of petrophysical data shows that the irreducible water saturation of reservoirs in the second member of the Shahejie Formation (Sha-2 Member) in some oilfields around Bohai Bay is relatively high. It is due to fine lithology, high shale content, complex pore structure, and developed micro-porosity. The key to accurately identifying the type of reservoir fluid is the irreducible water saturation. Under the circumstances of mercury injection data and abundant data of nuclear magnetic resonance(NMR) logging, pore structure was classified with NMR logging and quantitative discriminant relations were established between conventional logging data and pore structure types using the algorithm of Bayesian successive discrimination. Based on pore structure types, irreducible water saturation calculated by the NMR T2 spectrum was used to establish relations with porosity and permeability. With this method, it can calculate the reservoir's irreducible water saturation without core data and NMR logging. Examples show that the method has better application and higher precision. It can offer some valuable guidance to evaluate the low porosity and low permeability of sandstone reservoirs.
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This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in Xi’an, China, 16–18 November 2022.
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Lin, Xc., Yan, Lh., Ding, Yj., Jiang, Nn., Ma, Db., Wang, Yj. (2023). A Method for Determining Irreducible Water Saturation Based on Pore Structure Type. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2022. IFEDC 2022. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-99-1964-2_5
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DOI: https://doi.org/10.1007/978-981-99-1964-2_5
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