Modelling approaches for the estimation of irreducible water saturation and heterogeneities of the commercial Ashtart reservoir from the Gulf of Gabès, Tunisia

Taktak, Fatma; Rigane, Adel; Boufares, Taoufik; Kharbachi, Samir; Bouaziz, Samir

doi:10.1016/j.petrol.2011.06.023

Cited by 17 publications

(7 citation statements)

References 9 publications

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“…At present, S wir can be obtained from the nuclear magnetic resonance (NMR) experiment (Borgia et al 1996), weighing method (Coskun and Wardlaw 1995;Taktak et al 2011), mercury injection capillary pressure method (Bear et al 2011;Zhang et al 2017) and semi-permeable diaphragm capillary pressure method (Coskun and Wardlaw 1995;Taktak et al 2011). However, these methods have some disadvantages.…”

Section: Introductionmentioning

confidence: 99%

A new model for predicting irreducible water saturation in tight gas reservoirs

et al. 2020

Pet. Sci.

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The irreducible water saturation (S wir) is a significant parameter for relative permeability prediction and initial hydrocarbon reserves estimation. However, the complex pore structures of the tight rocks and multiple factors of the formation conditions make the parameter difficult to be accurately predicted by the conventional methods in tight gas reservoirs. In this study, a new model was derived to calculate S wir based on the capillary model and the fractal theory. The model incorporated different types of immobile water and considered the stress effect. The dead or stationary water (DSW) was considered in this model, which described the phenomena of water trapped in the dead-end pores due to detour flow and complex pore structures. The water film, stress effect and formation temperature were also considered in the proposed model. The results calculated by the proposed model are in a good agreement with the experimental data. This proves that for tight sandstone gas reservoirs the S wir calculated from the new model is more accurate. The irreducible water saturation calculated from the new model reveals that S wir is controlled by the critical capillary radius, DSW coefficient, effective stress and formation temperature.

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Section: Introductionmentioning

confidence: 99%

A new model for predicting irreducible water saturation in tight gas reservoirs

et al. 2020

Pet. Sci.

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“…A number of works have been reported on the capillary pressure of the multi-phase displacement process by experimental measurements, including the porous diaphragm (or restored capillary pressure) method, 10 the centrifugal method, 11 the mercury injection method 12–14 and the dynamic capillary pressure method. 13,15 However, enormous challenges emerge during the direct observation of the displacement process and measurement of the capillary pressure in nanoscales.…”

Section: Introductionmentioning

confidence: 99%

“…7 Therefore, the knowledge about the threshold capillary pressure for oil displacement by injected water through ultra-narrow pore throats is imperative to well productivity, 8 which can provide theoretical guidance to shale/ tight oil exploitations. 9 A number of works have been reported on the capillary pressure of the multi-phase displacement process by experimental measurements, including the porous diaphragm (or restored capillary pressure) method, 10 the centrifugal method, 11 the mercury injection method [12][13][14] and the dynamic capillary pressure method. 13,15 However, enormous challenges emerge during the direct observation of the displacement process and measurement of the capillary pressure in nanoscales.…”

Section: Introductionmentioning

confidence: 99%

Breakthrough pressure of oil displacement by water through the ultra-narrow kerogen pore throat from the Young–Laplace equation and molecular dynamic simulations

Zhao

Zhan

et al. 2022

Phys. Chem. Chem. Phys.

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“…Geological factors influencing the recovery efficiency are maturity of organic matter, irreducible water, porosity, permeability, coal quality, gas content, reservoir pressure, and so forth. − Among these factors, irreducible water is formed when water molecules are adsorbed onto solid surfaces by the capillary force and is difficult to be mobilized at lower driving pressures. , Then, irreducible water blocks the gas inside the matrix and makes it difficult to migrate. Researches indicate that irreducible water is an important parameter influencing the CBM drainage performance, − and the influence should be discussed before works of reservoir estimation, historical matching, and CBM production prediction. ,, …”

Section: Introductionmentioning

confidence: 99%

Geological Control of Irreducible Water Within the Coal Matrix and Its Quantified Evaluation Model

et al. 2020

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This paper adopts the measurement of mercury intrusion porosimetry and nuclear magnetic resonance (NMR) to analyze the pore system and the pore structure of coal samples, and the measurement of maceral group composition, scanning electron microscopy, and energy dispersive X-ray spectroscopy to obtain the organic/inorganic composition of coal samples. Gravimetric and NMR methods are both used to calculate irreducible water saturation of the samples, and qualitative and quantitative research studies are therefore conducted. The following knowledge is obtained. Coal samples can be classified as micro-trans-pore-dominated samples, meso-macro-pore-dominated samples, cleat-dominated samples, and even development samples. The main composition of the samples is organic, and a little kaolinite and pyrite can be observed. Irreducible water saturation obtained by the gravimetric method is almost close to that gained by the NMR method. The influencing parameters can be divided into two categories. The first category contains the maximum vitrinite reflectance, volumetric factor, fixed carbon yield, volatile yield, vitrinite percentage, and inertinite percentage, which have a strong correlation with irreducible water saturation. The second category includes the buried depth and median radius, and they have a weak correlation with irreducible water saturation. Multivariate regression shows that there is a linear quaternion equation between irreducible water saturation and independent variables such as maximum vitrinite reflectance, volumetric factor, volatile yield, and vitrinite percentage.

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Modelling approaches for the estimation of irreducible water saturation and heterogeneities of the commercial Ashtart reservoir from the Gulf of Gabès, Tunisia

Cited by 17 publications

References 9 publications

A new model for predicting irreducible water saturation in tight gas reservoirs

A new model for predicting irreducible water saturation in tight gas reservoirs

Breakthrough pressure of oil displacement by water through the ultra-narrow kerogen pore throat from the Young–Laplace equation and molecular dynamic simulations

Geological Control of Irreducible Water Within the Coal Matrix and Its Quantified Evaluation Model

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