Evaluation of the reservoir permeability of anthracite coals by geophysical logging data

Li, Junqian; Liu, Dameng; Yao, Yanbin; Cai, Yidong; Qiu, Yongkai

doi:10.1016/j.coal.2011.06.001

Cited by 90 publications

(41 citation statements)

References 12 publications

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“…If there are no producing wells in the field, proven techniques to determine coal reservoir properties include laboratory analyses (Gash, 1991;Saulsberry et al, 1996), geophysical logs (Li et al, 2011), and well testing methods (Aminian and Ameri, 2009;Nie et al, 2012). The major problem is, however, that it is not easy to determine reservoir properties of coal seams and they may be quite variable within the coal seam, even within relatively short distances.…”

Section: Significance and Objectivementioning

confidence: 99%

Production history matching to determine reservoir properties of important coal groups in the Upper Pottsville formation, Brookwood and Oak Grove fields, Black Warrior Basin, Alabama

Karacan

2013

Journal of Natural Gas Science and Engineering

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The Black Warrior Basin of Alabama is one of the most important coal mining and coalbed methane production areas in the United States. Methane control efforts through degasification that started almost 25 years ago for the sole purpose of ensuring mining safety resulted in more than 5000 coalbed methane wells distributed within various fields throughout the basin. The wells are completed mostly in the Pratt, Mary Lee, and Black Creek coal groups of the Upper Pottsville formation and present a unique opportunity to understand methane reservoir properties of these coals and to improve their degasification performances.The Brookwood and Oak Grove fields in the Black Warrior Basin are probably two of the most important fields in the basin due to current longwall coal mining activities. In this work, methane and water productions of 92 vertical wellbores drilled, some completed 20 years ago, over a current large coal mine district located in these two fields, were analyzed by history matching techniques. The boreholes were completed at the Mary Lee coal group, or at combinations of the Pratt, Mary Lee, and Black Creek groups. History matching models were prepared and performed according to properties of each coal group.Decline curve analyses showed that effective exponential decline rates of the wells were between 2% and 25% per year. Results of production history matching showed, although they varied by coal group, that pressure decreased as much as 80% to nearly 25 psi in some areas and resulted in corresponding decreases in methane content. Water saturation in coals decreased from 100% to between 20 and 80%, improving gas relative permeabilities to as much as 0.8. As a result of primary depletion, permeability of coal seams increased between 10 and 40% compared to their original permeability, which varied between 1 and 10 md depending on depth and coal seam. These results not only can be used for diagnostic and interpretation purposes, but can be used as parameter distributions in probabilistic simulations, as illustrated in the last section of this paper. They can also be used in conjunction with spatial modeling and geological considerations to calculate potential methane emissions in operating mines.

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Section: Significance and Objectivementioning

confidence: 99%

Production history matching to determine reservoir properties of important coal groups in the Upper Pottsville formation, Brookwood and Oak Grove fields, Black Warrior Basin, Alabama

Karacan

2013

Journal of Natural Gas Science and Engineering

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“…Second, the evaluation column of logging data are defines as: According to the basic principle of grey correlation method, the grey correlation degree (P i ) between any logging curve and coal structures is calculated: (6) where, ρ is grey resolution ratio, ρ=0.5 [20].…”

Section: Methodsmentioning

confidence: 99%

“…The main deformation characteristics of cataclastic coal are induced fractures, high porosity and permeability and low adsorption capacities. Tectonic deformation is produced in grated coal, which suffers shear failure, with granules partially and relatively low permeability [6,7].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Evaluation of Coal Structures with the Aid of Geophysical Logging Data

Teng¹,

Liu²,

Yao³

et al. 2016

IJHIT

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“…To investigate relevant problems in reservoir engineering, most studies rely on forward problems of seismic interpretation, logging interpretation, and core sampling experiments and combine these with mathematical statistics 2 Advances in Mechanical Engineering for a solution. As a result, many complex technologies and additional time will be needed [8][9][10]. In addition, there is always a large error between calculation of the water production rate and historical rate in most reservoir water cut analysis [11,12].…”

Section: Introductionmentioning

confidence: 99%

An Estimation Method of Water Drive Displacement Based on Formation Permeability Distribution and Inverse Problem Modeling

Huang

Wang

et al. 2014

Advances in Mechanical Engineering

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Formation permeability distribution is important in the oil industry since it is a key tool in forecasting oil production performance, a matter of primary concern to oilfield operators. However, the direct problems of reservoir analysis are limited in practice by a lack of input parameters such as reservoir vertical heterogeneity. Therefore, inverse problem modeling is important to achieve reservoir vertical heterogeneity using production profiles, which are always known for existing reservoirs. In this way, what has occurred inside a reservoir can be understood by applying reservoir output in the reverse model. Because formation permeability can frequently be represented by a normal distribution and can describe heterogeneity and water production capability, an inverse problem of formation permeability was modeled to study reservoir vertical heterogeneity and reservoir production performance based on oil-water two-fluid flow theory and optimization problems. Moreover, through establishing an objective function, we obtained an optimal solution for water production rate. Finally, one case is simulated by this model and good results achieved, which are compatible with production and experimental data.

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Evaluation of the reservoir permeability of anthracite coals by geophysical logging data

Cited by 90 publications

References 12 publications

Production history matching to determine reservoir properties of important coal groups in the Upper Pottsville formation, Brookwood and Oak Grove fields, Black Warrior Basin, Alabama

Production history matching to determine reservoir properties of important coal groups in the Upper Pottsville formation, Brookwood and Oak Grove fields, Black Warrior Basin, Alabama

Quantitative Evaluation of Coal Structures with the Aid of Geophysical Logging Data

An Estimation Method of Water Drive Displacement Based on Formation Permeability Distribution and Inverse Problem Modeling

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