Controls on Gas Content and Carbon Isotopic Abundance of Methane in Qinnan-East Coal Bed Methane Block, Qinshui Basin, China

In this study, the well logging response of CBM reservoir have been analyzed, and discussing the factors that affect the gas content of coal seam. The well logging technology has been employed in connection with log data and gas content. Take one oilfield’s well logging data for example, statistical analysis method and Langmuir equation method are selected to calculate the gas content of one coal seam, the two calculated results are basically the same, the highest value are about 26 cm3/g, is a high-yield coal seam.

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Seismic studies of coal bed methane content in the west coal mining area of Qinshui Basin

International Journal of Mining Science and Technology ◽

10.1016/j.ijmst.2013.10.003 ◽

2013 ◽

Vol 23 (6) ◽

pp. 795-803 ◽

Cited By ~ 3

Author(s):

Guangui Zou ◽

Suping Peng ◽

Caiyun Yin ◽

Yanyong Xu ◽

Fengying Chen ◽

...

Keyword(s):

Coal Mining ◽

Mining Area ◽

Methane Content ◽

Coal Bed ◽

Coal Bed Methane ◽

The West ◽

Qinshui Basin ◽

Coal Mining Area

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Relationship between Maceral of Coal and Coal-bed Methane adsorption ability in Sihe Coalmine of Qinshui Basin, China

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/359/1/012026 ◽

2018 ◽

Vol 359 ◽

pp. 012026

Author(s):

M S Wang ◽

G G Zou ◽

R B Zhu

Keyword(s):

Methane Adsorption ◽

Coal Bed ◽

Coal Bed Methane ◽

Adsorption Ability ◽

Qinshui Basin

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Research on Result Prediction of Coal-Bed Gas Wells Fracturing by Using Expert System

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.734-737.1445 ◽

2013 ◽

Vol 734-737 ◽

pp. 1445-1449

Author(s):

Chi Ai ◽

Chao Yang Hu ◽

Yu Wei Li ◽

Feng Jiao Wang

Keyword(s):

Expert System ◽

Coal Seam ◽

Hydraulic Fracturing ◽

Gas Content ◽

Coal Bed ◽

Coal Bed Methane ◽

Main Method ◽

Number Of Factors ◽

Coal Seam Thickness ◽

Expert Database

Hydraulic fracturing is the main method to increase the output of coal-bed methane wells, however, the hydraulic fracturing result of coal-bed methane well is usually affected by large number of factors such as the conditions of coal-bed, the conditions of coal-bed methane well, fracturing operation parameters and so on. As a result, the fracturing operation result is difficult to predict. This paper assumed coal seam thickness, the depth of coal seam, coal seam gas content and other six main factors which affect hydraulic fracturing results by analysis various factors. Membership function of the expert system was established to divide the level of each factor. The established method which applies the expert system to predict the hydraulic fracturing results of coal-bed methane wells was based on expert database. Using the established expert system to calculate 200 groups of test data and the prediction error rate is only 3.5%. The prediction results are accurate and reliable, and can provide guidance for coal-bed methane wells fracturing optimization.

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Geological controls over coal-bed methane well production in southern Qinshui basin

Procedia Earth and Planetary Science ◽

10.1016/j.proeps.2009.09.142 ◽

2009 ◽

Vol 1 (1) ◽

pp. 917-922 ◽

Cited By ~ 27

Author(s):

Shu-xun Sang ◽

Hui-hu Liu ◽

Yang-min Li ◽

Meng-xi Li ◽

Lin Li

Keyword(s):

Coal Bed ◽

Coal Bed Methane ◽

Qinshui Basin ◽

Well Production ◽

Southern Qinshui Basin

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Peak Gas Production Analysis and Influencing Factors Study of Coal Bed Methane Well

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1030-1032.1388 ◽

2014 ◽

Vol 1030-1032 ◽

pp. 1388-1393 ◽

Cited By ~ 2

Author(s):

Wei Ding ◽

Hua Chao Sun ◽

Zhao Hui Xia ◽

Yun Peng Hu ◽

Qiang Fu Kong ◽

...

Keyword(s):

Influencing Factors ◽

Gas Production ◽

Gas Content ◽

Coal Bed ◽

Coal Bed Methane ◽

Gas Field ◽

Gas Saturation ◽

Desorption Time ◽

Study Results ◽

Cleat Porosity

The value of peak gas production and the time when it reaches are two important marks for coal bed methane (CBM) well’s gas production curve. This paper takes M CBM gas field of A country’s B basin as actual production instance. Firstly, based on the CBM producing mechanism, the existence reason of peak gas rate is analyzed; secondly, the influencing factors of the value of peak gas production and the time when it reaches is studied by numerical simulation method. And sensitivity order of the influencing factors is obtained. The study results indicate that: the value of peak gas production has positive correlation with properties: permeability, gas content, coal bed net pay and gas saturation; while negative correlation with desorption time and cleat porosity. And the strong to weak intensity of sensitivity is permeability, gas content, desorption time, net coal bed pay, cleat porosity, gas saturation. The time when peak gas production reaches is markedly influenced by the value desorption time and cleat porosity, the smaller of the two parameters, the shorter of the time when peak gas production reaches.

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Stimulating methane generation within coal seam reservoirs

The APPEA Journal ◽

10.1071/aj14076 ◽

2015 ◽

Vol 55 (2) ◽

pp. 441

Author(s):

Nicholas Lupton ◽

Regina Sander ◽

Luke Connell ◽

Michael Camilleri ◽

Deasy Heryanto ◽

...

Keyword(s):

Coal Seam ◽

Atmospheric Pressure ◽

Nutrient Balance ◽

Gas Content ◽

Coal Bed ◽

Coal Bed Methane ◽

Reservoir Pressure ◽

Core Flooding ◽

Gas Generation ◽

Methane Generation

Methane generation by microbial activity or biogenesis is a significant source of coal bed methane (Faiz and Hendry, 2006; Strapoć et al, 2011). Being able to stimulate microbial methane generation in a coal seam reservoir has the potential to add significant value to depleted or undersaturated fields. Several laboratory studies have demonstrated that this process can be stimulated through the addition of inorganic nutrients (Jones et al, 2010; Orem et al, 2010). These studies, performed at atmospheric pressure on crushed coal, provide encouraging support for the concept of inducing in-situ biogenic methanogenesis and increasing gas-in-place in coal bed methane reservoirs. Important questions, however, remain about how laboratory results relate to what occurs in the reservoir. This extended abstract presents the results from a series of core flooding experiments conducted at reservoir pressure and temperature on intact coal core samples. Nutrient consumption is characterised by measuring the nutrient balance between the inflow and outflow waters. Gas content is measured through a helium flood at the end of the experiment, during which the pore pressure is dropped to atmospheric pressure to drive off any adsorbed gas. These experiments confirm that microbial gas generation does occur at reservoir pressure and temperature, and at high enough rates to rapidly increase gas content.

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