COsub2/sub Trapping in Reservoirs with Fluvial Architecture: Sensitivity to Heterogeneity in Permeability and Constitutive Relationship Parameters for Different Rock Types

Naum I. Gershenzon; Robert W. Ritzi; David F. Dominic; Edward Mehnert; Roland T. Okwen; Christopher Patterson

doi:10.1016/j.petrol.2016.09.008

COsub2/sub Trapping in Reservoirs with Fluvial Architecture: Sensitivity to Heterogeneity in Permeability and Constitutive Relationship Parameters for Different Rock Types

Naum I. Gershenzon, Robert W. Ritzi, David F. Dominic, Edward Mehnert, Roland T. Okwen, Christopher Patterson

Research output: Contribution to journal › Article › peer-review

Abstract

A number of important CO 2 <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/reservoir" title="Learn more about Reservoir from ScienceDirect's AI-generated Topic Pages"> reservoir </a> candidates exhibit sedimentary architecture reflecting fluvial deposition, which typically includes small-scale (decimeter to meter) textural <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/facies" title="Learn more about Facies from ScienceDirect's AI-generated Topic Pages"> facies </a> among different rock types. As a result, highly contrasting <a href="https://www.sciencedirect.com/topics/engineering/spatial-distribution" title="Learn more about Spatial Distribution from ScienceDirect's AI-generated Topic Pages"> spatial distribution </a> of <a href="https://www.sciencedirect.com/topics/engineering/intrinsic-permeability" title="Learn more about Intrinsic Permeability from ScienceDirect's AI-generated Topic Pages"> intrinsic permeability </a> and <a href="https://www.sciencedirect.com/topics/engineering/constitutive-relationship" title="Learn more about Constitutive Relationship from ScienceDirect's AI-generated Topic Pages"> constitutive relationship </a> parameters (capillary pressure and <a href="https://www.sciencedirect.com/topics/engineering/relative-permeability-characteristic" title="Learn more about Relative Permeability Characteristic from ScienceDirect's AI-generated Topic Pages"> relative permeability characteristic </a> curves) are common for this type of reservoir. Previously, we showed that small-scale <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/heterogeneity" title="Learn more about Heterogeneity from ScienceDirect's AI-generated Topic Pages"> heterogeneity </a> organized in fluvial depositional architecture controls the dynamics of a CO 2 <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/plume" title="Learn more about Plume from ScienceDirect's AI-generated Topic Pages"> plume </a> during the injection and postinjection periods. This is due to (1) highly <a href="https://www.sciencedirect.com/topics/engineering/anisotropic" title="Learn more about Anisotropic from ScienceDirect's AI-generated Topic Pages"> anisotropic </a> <a href="https://www.sciencedirect.com/topics/engineering/effective-permeability" title="Learn more about Effective Permeability from ScienceDirect's AI-generated Topic Pages"> effective permeability </a> causing CO 2 to move in laterally, and (2) trapping by capillary pinning, which is in addition to snap-off capillary trapping. The detailed petrophysical and geological parameters of any specific reservoir are typically uncertain, which motivates studies of <a href="https://www.sciencedirect.com/topics/engineering/sensitivity-parameter" title="Learn more about Sensitivity Parameter from ScienceDirect's AI-generated Topic Pages"> parameter sensitivity </a> . The goal of this paper is to analyze the sensitivity of capillary trapping and dissolution to the variability in basic petrophysical parameters and rock composition in highly heterogeneous fluvial-type reservoirs. We show that (1) the larger the contrast in permeability between rock types the larger the CO 2 plume and the larger the rate of capillary trapping and dissolution; (2) an increase in <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/capillary-pressure" title="Learn more about Capillary Pressure from ScienceDirect's AI-generated Topic Pages"> capillary pressure </a> contrast increases pinning trapping; and (3) the variability in the proportion between high- and low-permeability rocks (difference in <a href="https://www.sciencedirect.com/topics/earth-and-planetary-sciences/connectivity" title="Learn more about Connectivity from ScienceDirect's AI-generated Topic Pages"> connectivity </a> of high-permeability clusters) does not affect snap-off trapping and dissolution, although it does strongly affect their spatial distributions. Though dissolution and snap-off capillary trapping may vary by up to 40% because of parameter variability, the trapping by capillary pinning may vary by an order of magnitude.

Original language	American English
Journal	Journal of Petroleum Science and Engineering
Volume	155
DOIs	https://doi.org/10.1016/j.petrol.2016.09.008
State	Published - Jul 1 2017

Disciplines

Physical Sciences and Mathematics
Physics

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COsub2/sub Trapping in Reservoirs with Fluvial Architecture: Sensitivity to Heterogeneity in Permeability and Constitutive Relationship Parameters for Different Rock Types. / Gershenzon, Naum I.; Ritzi, Robert W.; Dominic, David F. et al.
In: Journal of Petroleum Science and Engineering, Vol. 155, 01.07.2017.

Research output: Contribution to journal › Article › peer-review

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title = "COsub2/sub Trapping in Reservoirs with Fluvial Architecture: Sensitivity to Heterogeneity in Permeability and Constitutive Relationship Parameters for Different Rock Types",

abstract = " A number of important CO 2 reservoir candidates exhibit sedimentary architecture reflecting fluvial deposition, which typically includes small-scale (decimeter to meter) textural facies among different rock types. As a result, highly contrasting spatial distribution of intrinsic permeability and constitutive relationship parameters (capillary pressure and relative permeability characteristic curves) are common for this type of reservoir. Previously, we showed that small-scale heterogeneity organized in fluvial depositional architecture controls the dynamics of a CO 2 plume during the injection and postinjection periods. This is due to (1) highly anisotropic effective permeability causing CO 2 to move in laterally, and (2) trapping by capillary pinning, which is in addition to snap-off capillary trapping. The detailed petrophysical and geological parameters of any specific reservoir are typically uncertain, which motivates studies of parameter sensitivity . The goal of this paper is to analyze the sensitivity of capillary trapping and dissolution to the variability in basic petrophysical parameters and rock composition in highly heterogeneous fluvial-type reservoirs. We show that (1) the larger the contrast in permeability between rock types the larger the CO 2 plume and the larger the rate of capillary trapping and dissolution; (2) an increase in capillary pressure contrast increases pinning trapping; and (3) the variability in the proportion between high- and low-permeability rocks (difference in connectivity of high-permeability clusters) does not affect snap-off trapping and dissolution, although it does strongly affect their spatial distributions. Though dissolution and snap-off capillary trapping may vary by up to 40% because of parameter variability, the trapping by capillary pinning may vary by an order of magnitude. ",

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AU - Ritzi, Robert W.

AU - Dominic, David F.

AU - Mehnert, Edward

AU - Okwen, Roland T.

AU - Patterson, Christopher

PY - 2017/7/1

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AB - A number of important CO 2 reservoir candidates exhibit sedimentary architecture reflecting fluvial deposition, which typically includes small-scale (decimeter to meter) textural facies among different rock types. As a result, highly contrasting spatial distribution of intrinsic permeability and constitutive relationship parameters (capillary pressure and relative permeability characteristic curves) are common for this type of reservoir. Previously, we showed that small-scale heterogeneity organized in fluvial depositional architecture controls the dynamics of a CO 2 plume during the injection and postinjection periods. This is due to (1) highly anisotropic effective permeability causing CO 2 to move in laterally, and (2) trapping by capillary pinning, which is in addition to snap-off capillary trapping. The detailed petrophysical and geological parameters of any specific reservoir are typically uncertain, which motivates studies of parameter sensitivity . The goal of this paper is to analyze the sensitivity of capillary trapping and dissolution to the variability in basic petrophysical parameters and rock composition in highly heterogeneous fluvial-type reservoirs. We show that (1) the larger the contrast in permeability between rock types the larger the CO 2 plume and the larger the rate of capillary trapping and dissolution; (2) an increase in capillary pressure contrast increases pinning trapping; and (3) the variability in the proportion between high- and low-permeability rocks (difference in connectivity of high-permeability clusters) does not affect snap-off trapping and dissolution, although it does strongly affect their spatial distributions. Though dissolution and snap-off capillary trapping may vary by up to 40% because of parameter variability, the trapping by capillary pinning may vary by an order of magnitude.

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ER -

COsub2/sub Trapping in Reservoirs with Fluvial Architecture: Sensitivity to Heterogeneity in Permeability and Constitutive Relationship Parameters for Different Rock Types

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