Alternative modelling approaches for the estimation of irreducible water saturation: Australian hydrocarbon basins

Goda, Hussam Mohammed; Behrenbruch, Peter; Maier, Holger R.

doi:10.1016/j.petrol.2005.10.013

Cited by 16 publications

(7 citation statements)

References 10 publications

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“…A lot of empirical equations have been proposed to describe the Downloaded by [Florida International University] at 04:09 08 January 2015 water-oil relative permeability until now (Brooks, 1966;Frode, 2005;Goda, 2007;Hou, 2011;Roghanian, 2012). However, the most simply and widely used model is proposed by Craft and Hawkins (1959), as Eq.…”

Section: Theoretical Basis Of the New Water Displacement Curvementioning

confidence: 99%

A New Water Displacement Curve for the High Water-cut Stage

Wang

Hou

et al. 2013

Petroleum Science and Technology

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Field practices show the adaptability of the water displacement curve at the ultra-high water-cut stage is poor. The authors first proposed a new water displacement curve, and then put forward a new method to obtain the parameters in the new curve equation. Then a new characterization equation to describe the relationship between water-oil relative permeability ratio and water saturation is proposed, which is the new water displacement curve's theoretical basis. Finally, based on the case study it is proved that the new curve are more accurate in predicting the development performance at the ultra-high water-cut stage.

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Section: Theoretical Basis Of the New Water Displacement Curvementioning

confidence: 99%

A New Water Displacement Curve for the High Water-cut Stage

Wang

Hou

et al. 2013

Petroleum Science and Technology

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“…Researches indicate that irreducible water is an important parameter influencing the CBM drainage performance, 9−11 and the influence should be discussed before works of reservoir estimation, historical matching, and CBM production prediction. 2,5,12 The coal matrix is made up of organic matter, clay, and others. Large amounts of nanopores developed in organic matter are the major storage space for irreducible water.…”

Section: Introductionmentioning

confidence: 99%

“…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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“…Many recent studies have been conducted to infer petrophysical properties of such reservoirs (examples include Al-Shahwan & Al-Iessa, 2015;Goda et al, 2007;Taktak et al, 2011;Ballay et al, 2007;Knackstedt et al, 2007;Sadeq & Yusoff, 2015;Eberli et al, 2003) aiming to understand and describe the behavior of those systems under oil production. Such reservoirs are strongly marked by heterogeneity in their porous space, which is strongly influenced by effects as dissolution, precipitation, reprecipitation, dolomitization and fracturing that, differently from siliciclastic reservoirs (e.g.…”

Section: Introductionmentioning

confidence: 99%

Petrophysical Rock Typing of Coquinas From the Morro Do Chaves Formation, Sergipe-Alagoas Basin (Northeast Brazil)

Luna¹,

Perosi²,

Ribeiro³

et al. 2016

Rev. Bras. Geof.

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ABSTRACT. This work has analyzed, considering the petrophysical point of view, samples of Coquinas obtained in the outcrop of the Morro do Chaves formation (Sergipe-Alagoas Basin). The complex sedimentological aspects for this study have been reduced by focusing on a single bed. The reservoirs found in this basin have the same age of the reservoirs of Campos, Santos and Espírito Santo Basins (Brazil) and Congo (Africa), from the end of Barremian to the beginning of Aptinian ages, which can be considered analogs of those ones. The data were collected applying routine core analysis and special core analysis techniques in five samples taken vertically, reproducing the case in a single well through a bed of coquinas, with a spacing of approximately 20 cm between each one, to replicate what might be sampled in subsurface coring operations. Measurements of porosity and effective permeability by gas expansion, Nuclear Magnetic Resonance and resistivity were conducted.The analysis of the data revealed the heterogeneity of the porous space in terms of pore sizes and correlations between permeability and electrical formation factor.Along with this detailed analysis, a petrotyping classification of the samples was done using the Global Hydraulic Elements method, to compare with a larger poro-perm data set from a lateral profile. This work shows that the heterogeneity in these few samples from a single bed along a vertical profile is representative for heterogeneity over a much larger coquina data set from the same bed away from this single profile. This work has implications for the scaling and interpretation of NMR data from plug data to log data in these sequences and the resulting prediction of permeability from the latter.Keywords: carbonate, porosity and permeability properties, NMR, electrical resistivity. RESUMO.Esse trabalho analisa, considerando o ponto de vista petrofísico, amostras de Coquinas obtidas em afloramento da Formação Morro do Chaves (Bacia de Sergipe-Alagoas). Os aspectos sedimentológicos complexos envolvidos neste estudo foram reduzidos, focando em umaúnica camada. Os reservatórios encontrados nesta bacia têm a mesma idade dos reservatórios das Bacias de Campos, Santos e Espirito Santo (Brasil) e Congo (África), final do Barremiano ao início do Aptiano, as quais podem ser consideradas análogas daquelas. Os dados foram obtidos por meio de técnicas de petrofísica básica e petrofísica especial em cinco amostras extraídas verticalmente, reproduzindo o caso de umúnico poço através de uma camada de coquinas, com um espaçamento de aproximadamente 20 cm entre cada uma, de forma a replicar o que poderia ser amostrado em uma operação de retirada de plugs em subsuperfície. Medidas de porosidade e permeabilidade efetiva por expansão de gás, Ressonância Magnética Nuclear e resistividade foram obtidas. A análise dos dados revelou a heterogeneidade do espaço poroso em termos de tamanho de poros e correlações entre permeabilidade e fator de formação elétrico. Junto a essa análise detalhada, foi realizada a classific...

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Alternative modelling approaches for the estimation of irreducible water saturation: Australian hydrocarbon basins

Cited by 16 publications

References 10 publications

A New Water Displacement Curve for the High Water-cut Stage

A New Water Displacement Curve for the High Water-cut Stage

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

Petrophysical Rock Typing of Coquinas From the Morro Do Chaves Formation, Sergipe-Alagoas Basin (Northeast Brazil)

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