Abstract
When simulating borehole resistivity measurements in a reservoir, it is common to consider an oil-water contact (OWC) planar interface. However, this consideration can lead to an unrealistic model since in the presence of capillary actions, the mix of two immiscible fluids (oil and water) often appears as an oil-water transition (OWT) zone. These transition zones may be significant in the vertical direction (20 m or above), and in context of geosteering, an efficient method to simulate the OWT zone can maximize the production of an oil reservoir. Herein, we propose an efficient one and a half-dimensional (1.5D) numerical solver to accurately simulate the OWT zone in an oil reservoir. Using this method, we can easily consider arbitrary resistivity distributions in the vertical direction, as it occurs in an OWT zone. Numerical results on synthetic examples demonstrate significant differences between the results recorded by a geosteering device when considering a realistic OWT zone vs an OWC sharp interface.
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Funding
Mostafa Shahriari has been financially supported by the Austrian Ministry for Transport, Innovation and Technology, the Federal Ministry for Digital and Economic Affairs, and the Province of Upper Austria in the frame of the COMET center SCCH.
David Pardo has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement no. 777778 (MATHROCKS), the POCTEFA H2020 Project PIXIL (EFA362/19), the Project of the Spanish Ministry of Economy and Competitiveness with reference MTM2016-76329-R (AEI/FEDER, EU), the BCAM “Severo Ochoa” accreditation of excellence (SEV-2017-0718), and the Basque Government through the BERC 2018-2021 program, the two Elkartek projects ArgIA (KK-2019-00068) and MATHEO (KK-2019-00085), and the Consolidated Research Group MATHMODE (IT1294-19) given by the Department of Education.
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Shahriari, M., Pardo, D. Borehole resistivity simulations of oil-water transition zones with a 1.5D numerical solver. Comput Geosci 24, 1285–1299 (2020). https://doi.org/10.1007/s10596-020-09946-5
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DOI: https://doi.org/10.1007/s10596-020-09946-5