scholarly journals Sensitivity analysis of fluid substitution in a porous medium with aligned fractures

2010 ◽  
Author(s):  
Samik Sil ◽  
Mrinal K. Sen ◽  
Boris Gurevich
Keyword(s):  
Sensitivity Analysis ◽  
Porous Medium ◽  
Fluid Substitution

Analysis of Capillary–Viscous–Gravity Forces in Biopolymer Flooding with a Sensitivity Analysis on Polymer and Porous Medium Parameters

2014 ◽  
Vol 35 (12) ◽  
pp. 1764-1773 ◽  
Author(s):  
Esmaeil Hamidpour ◽  
Abouzar Mirzaei-Paiaman ◽  
Ahmad Ramazani S. A. ◽  
Ashkan Hatami
Keyword(s):  
Sensitivity Analysis ◽  
Porous Medium ◽  
Gravity Forces

scholarly journals Porous medium modeling and parameter sensitivity analysis of 1-MCP distribution in boxes with apple fruit

2013 ◽  
Vol 119 (1) ◽  
pp. 13-21 ◽  
Author(s):  
Alemayehu Ambaw ◽  
Pieter Verboven ◽  
Thijs Defraeye ◽  
Engelbert Tijskens ◽  
Ann Schenk ◽  
...  
Keyword(s):  
Sensitivity Analysis ◽  
Porous Medium ◽  
Apple Fruit ◽  
Parameter Sensitivity ◽  
Parameter Sensitivity Analysis

scholarly journals Numerical modeling and sensitivity analysis of seawater intrusion in a dual-permeability coastal karst aquifer with conduit networks

2017 ◽  
Author(s):  
Zexuan Xu ◽  
Bill X. Hu ◽  
Ming Ye
Keyword(s):  
Sensitivity Analysis ◽  
Porous Medium ◽  
Hydraulic Conductivity ◽  
Seawater Intrusion ◽  
Global Sensitivity Analysis ◽  
Karst Aquifer ◽  
Hydrological Characteristics ◽  
Global Sensitivity ◽  
Coastal Karst ◽  
Submarine Spring

Abstract. In a coastal karst aquifer, seawater intrudes significantly landward through the highly permeable subsurface conduit system, and contaminates the groundwater resources in the porous medium. In this study, a two-dimensional coupled density-dependent flow and transport SEAWAT model is developed to study seawater intrusion in the dual-permeability karst aquifer. To provide guideline for modeling seawater intrusion in such an aquifer, local and global sensitivity analysis are conducted to evaluate the parameters of boundary conditions and hydrological characteristics, including hydraulic conductivity, effective porosity, specific storage and dispersivity of the conduit and the porous medium. In the local sensitivity analysis, simulations are more sensitive to all parameters at the seawater and freshwater mixing zone than elsewhere. The most important parameter for simulations in both domains is salinity at the submarine spring, which is also the boundary condition of the conduit. The hydrological characteristics of the conduit network are not only important to the simulations in the conduit, but also significantly affect the simulations in the porous medium, due to the interactions between the two systems. Therefore, salinity and head observations in the conduits and karst features have more values for calibrating the models and understanding seawater intrusion in a coastal karst aquifer. Compared to the local sensitivity analysis, the global sensitivity results are different in several parameters (hydraulic conductivity, porosity and the boundary conditions at the submarine spring), mainly due to the non-linear relationship of the parameters with respect to the simulations. The results of global sensitivity analysis also indicate that the Darcy's equation does not accurately calculate the conduit flow rate with hydraulic conductivity in the continuum SEAWAT model. Dispersivity is no longer an important parameter in the advection-dominated transport aquifer system with conduit, compared to the sensitivity results in a homogeneous porous medium. Based on the sensitivity analysis, the extents of seawater intrusion are quantitatively evaluated with the identified important parameters, including salinity at the submarine spring with rainfall recharge, sea level rise and longer simulation time under an extended low rainfall period.

AVA simultaneous inversion of partially stacked seismic amplitude data for the spatial delineation of lithology and fluid units of deepwater hydrocarbon reservoirs in the central Gulf of Mexico

Geophysics ◽  
2006 ◽  
Vol 71 (4) ◽  
pp. E41-E48 ◽  
Author(s):  
Arturo Contreras ◽  
Carlos Torres-Verdín ◽  
Tim Fasnacht
Keyword(s):  
Sensitivity Analysis ◽  
Gulf Of Mexico ◽  
Seismic Inversion ◽  
Hydrocarbon Reservoirs ◽  
Acoustic Properties ◽  
Fluid Substitution ◽  
Class Iii ◽  
Simultaneous Inversion ◽  
Seismic Amplitude ◽  
Amplitude Data

This paper describes the successful application of amplitude-versus-angle (AVA) inversion of prestack-seismic amplitude data to detect and delineate deepwater hydrocarbon reservoirs in the central Gulf of Mexico. Detailed AVA fluid/lithology sensitivity analysis was conducted to assess the nature of AVA effects in the study area based on well-log data. Standard techniques such as crossplot analysis, Biot-Gassmann fluid substitution, AVA reflectivity modeling, and numerical simulation of synthetic gathers were part of the AVA sensitivity analysis. Crossplot and Biot-Gassmann analyses indicate significant sensitivity of acoustic properties to fluid substitution. AVA reflectivity and angle-gather modeling indicate that the shale/sand interfaces represented by the top and base of the M-10 reservoir are associated with typical Class III AVA responses caused by relatively low-impedance gas-bearing sands. Consequently, prestack seismic inversion provided accurate and reliable quantitative information about the spatial distribution of lithology and fluid units within the turbidite reservoirs based on the interpretation of fluid/lithology-sensitive modulus attributes. From the integration of inversion results with analogous depositional models, the M-series reservoirs were interpreted as stacked terminal turbidite lobes within an overall fan complex. This interpretation is consistent with previous regional stratigraphic/depositional studies.

Heat transfer and sensitivity analysis in a double pipe heat exchanger filled with porous medium

2017 ◽  
Vol 121 ◽  
pp. 124-137 ◽  
Author(s):  
Kamel Milani Shirvan ◽  
Soroush Mirzakhanlari ◽  
Soteris A. Kalogirou ◽  
Hakan F. Öztop ◽  
Mojtaba Mamourian
Keyword(s):  
Heat Transfer ◽  
Sensitivity Analysis ◽  
Porous Medium ◽  
Heat Exchanger ◽  
Double Pipe ◽  
Pipe Heat

scholarly journals Numerical modeling and sensitivity analysis of seawater intrusion in a dual-permeability coastal karst aquifer with conduit networks

2018 ◽  
Vol 22 (1) ◽  
pp. 221-239 ◽  
Author(s):  
Zexuan Xu ◽  
Bill X. Hu ◽  
Ming Ye
Keyword(s):  
Sensitivity Analysis ◽  
Porous Medium ◽  
Hydraulic Conductivity ◽  
Boundary Conditions ◽  
Seawater Intrusion ◽  
Karst Aquifer ◽  
Global Sensitivity ◽  
Coastal Karst ◽  
Conduit System ◽  
Conduit Networks

Abstract. Long-distance seawater intrusion has been widely observed through the subsurface conduit system in coastal karst aquifers as a source of groundwater contaminant. In this study, seawater intrusion in a dual-permeability karst aquifer with conduit networks is studied by the two-dimensional density-dependent flow and transport SEAWAT model. Local and global sensitivity analyses are used to evaluate the impacts of boundary conditions and hydrological characteristics on modeling seawater intrusion in a karst aquifer, including hydraulic conductivity, effective porosity, specific storage, and dispersivity of the conduit network and of the porous medium. The local sensitivity analysis evaluates the parameters' sensitivities for modeling seawater intrusion, specifically in the Woodville Karst Plain (WKP). A more comprehensive interpretation of parameter sensitivities, including the nonlinear relationship between simulations and parameters, and/or parameter interactions, is addressed in the global sensitivity analysis. The conduit parameters and boundary conditions are important to the simulations in the porous medium because of the dynamical exchanges between the two systems. The sensitivity study indicates that salinity and head simulations in the karst features, such as the conduit system and submarine springs, are critical for understanding seawater intrusion in a coastal karst aquifer. The evaluation of hydraulic conductivity sensitivity in the continuum SEAWAT model may be biased since the conduit flow velocity is not accurately calculated by Darcy's equation as a function of head difference and hydraulic conductivity. In addition, dispersivity is no longer an important parameter in an advection-dominated karst aquifer with a conduit system, compared to the sensitivity results in a porous medium aquifer. In the end, the extents of seawater intrusion are quantitatively evaluated and measured under different scenarios with the variabilities of important parameters identified from sensitivity results, including salinity at the submarine spring with rainfall recharge, sea level rise, and a longer simulation time under an extended low rainfall period.

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