Impact of the capillary pressure-saturation pore-size distribution parameter on geological carbon sequestration estimates

• Autorzy: Cheng Ch.-L. , Perfect E. , Yu T. E. , Gragg M. J.

Identyfikatory

DOI

10.1016/j.jsm.2017.09.001

• Języki publikacji: EN

Abstrakty

EN

Cost estimates for geologic carbon sequestration (GCS) are vital for policy and decision makers evaluating carbon capture and storage strategies. Numerical models are often used in feasibility studies for the different stages of carbon injection and redistribution. Knowledge of the capillary pressure-saturation function for a selected storage rock unit is essential in applications used for simulating multiphase fluid flow and transport. However, the parameters describing these functions (e.g. the van Genuchten m pore size distribution parameter) are often not measured or neglected compared to other physical properties such as porosity and intrinsic permeability. In addition, the use of average instead of point estimates of m for numerical simulations of flow and transport can result in significant errors, especially in the case of coarse-grained sediments and fractured rocks. Such erroneous predictions can pose great risks and challenges to decision-making. We present a comparison of numerical simulation results based on average and point estimates of the van Genuchten m parameter for different porous media. Forward numerical simulations using the STOMP code were employed to illustrate the magnitudes of the differences in carbon sequestration predictions resulting from the use of height-averaged instead of point parameters. The model predictions were converted into cost estimates and the results indicate that varying m values in GCS modeling can cause cost differences of up to hundreds of millions dollars.

Słowa kluczowe

EN

geological carbon sequestration; numerical modelling; capillary pressure; saturation; cost estimate

PL

geologiczna sekwestracja węgla; modelowanie numeryczne; ciśnienie kapilarne; nasycenie; szacowanie kosztów

• Wydawca: Elsevier ; Główny Instytut Górnictwa
• Czasopismo: Journal of Sustainable Mining
• Rocznik: 2017
• Tom: Vol. 16, iss. 3
• Strony: 67--72
• Opis fizyczny: Bibliogr. 55 poz.

Twórcy

autor

Cheng Ch.-L.

• School of Earth, Environmental & Marine Sciences, Dept. Civil Engineering, University of Texas-Rio Grande Valley, Edinburg, TX 78539, USA

autor

Perfect E.

• Department of Earth and Planetary Sciences, University of Tennessee-Knoxville, Knoxville, TN 37996, USA

autor

Yu T. E.

• Department of Agricultural and Resource Economics, University of Tennessee-Knoxville, Knoxville, TN 37996, USA

autor

Gragg M. J.

• EnSafe Inc., Nashville, TN 37228, USA

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