BIO-ENHANCEMENT OF COAL BED METHANE RESOURCES IN THE SOUTHERN SYDNEY BASIN

2003 ◽  
Vol 43 (1) ◽  
pp. 595 ◽  
Author(s):  
M. Faiz ◽  
L. Stalker ◽  
N. Sherwood ◽  
A. Saghafi ◽  
M. Wold ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Late Cretaceous ◽  
Geological Structure ◽  
Gas Content ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Gas Generation ◽  
Biogenic Methane ◽  
High Production ◽  
Cbm Production

Coals in the Sydney Basin contain large amounts of gas ranging in composition from pure methane (CH4) to pure carbon dioxide (CO2). These gases are derived from thermogenic, magmatic and biogenic sources and their present-day distribution is mainly related to geological structure, depth and proximity to igneous intrusions.A coal bed methane (CBM) study of the Camden area of the Sydney Basin has been jointly conducted by Sydney Gas Company NL (SGC) and the Commonwealth Scientific and Industrial Research Organisation (CSIRO). The delineation of high production fairways is vital for any CBM project development to be commercially successful. An integrated research project employing various methods of reservoir characterisation, including geological, geochemical, geomechanical and gas storage analyses contribute to this delineation for the Camden area, where SGC is currently developing the 300-well Camden Gas Project.In particular, accurate determinations of gas content, saturation levels, composition and origin, as well as interpretations about distribution, are essential for identifying sweet spots for CBM production optimisation. The extent of gas saturation is a function of numerous factors, including amounts of gas generated between the Permian and Late Cretaceous, amounts expelled from the system during Late Cretaceous-Tertiary uplift and amounts of subsequent secondary biogenic methane generated and absorbed in the coals. The extent of this secondary biogenic gas generation appears to be greatest in coals proximal to the basin margins, where meteoric waters carrying bacteria and nutrients had ready access. Significant enhancement of methane content also occurs, however, in deeper parts of the basin where permeable structures exist.The integrated study shows that high production CBM wells drilled to date by SGC are located in zones of enhanced permeability. In these locations original thermogenic wet gases have been removed and additional secondary biogenic methane has been generated due to microbial alteration of coal, hydrocarbons and carbon dioxide. This process has replenished the coals by enhancing the methane contents of the respective seams and this phenomenon can be termed ‘bio-enhancement’ in the context of CBM production.

Stimulating methane generation within coal seam reservoirs

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.

scholarly journals POTENTIAL OF LIVESTOCK MANURE FOR COAL ACTIVATION

2017 ◽  
Vol 21 (1) ◽  
pp. 26 ◽  
Author(s):  
EllIN HARlIA HARlIA ◽  
MARlINA ET ◽  
MASITA R ◽  
RAHMAH KN
Keyword(s):  
Carbon Dioxide ◽  
Fatty Acids ◽  
Acetic Acid ◽  
Volatile Fatty Acids ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Anaerobic Conditions ◽  
Descriptive Approach ◽  
Carbon Dioxide Co2 ◽  
Reduction Of Co2

The natural methane formed by bacteria in anaerobic conditions is known as biogenic gas. Gas trapped in coal, formed through thermogenesis as well as biogenesisis known as coal-bed methane (CBM). The availability of organic material as decomposition of this material into methane is continuously required for the production of methane in the coal aquifer. The aim of this research was to investigate whether or not cattle feces bacteria were able to grow and produce methane in coal. Parameters measured were Volatile Fatty Acids (VFA) and the production of biogas, such as nitrogen, hydrogen, carbon dioxide, and methane. Explorative method was used and data obtained was analyzed by descriptive approach. The results showed that the bacteria found in the feces survived in the coal and produce biogas. On day 2 when the process was at the acidogenesis phase, it produced VFA with the largest component of acetic acid. Acetic acid would undergo decarboxylation and reduction of CO2 followed by reactions of H2and CO2 to produce methane (CH4) and carbon dioxide (CO2) as the final products. ,

Study on Well Logging Technology with Methods of Evaluating Gas Content of Coal-Bed Methane Reservoir

2014 ◽  
Vol 1003 ◽  
pp. 183-187
Author(s):  
Huai Jie Yang ◽  
He Ping Pan
Keyword(s):  
Statistical Analysis ◽  
Coal Seam ◽  
Well Logging ◽  
Langmuir Equation ◽  
Gas Content ◽  
Coal Bed ◽  
High Yield ◽  
Coal Bed Methane ◽  
Analysis Method ◽  
Statistical Analysis Method

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.

Important Factors to Propose High-Produced New Development Wells in CBM Project

2014 ◽  
Vol 1030-1032 ◽  
pp. 2578-2581
Author(s):  
Zhao Hui Xia ◽  
Ming Zhang ◽  
Bin Ren ◽  
Liang Chao Qu ◽  
Ze Hong Cui ◽  
...  
Keyword(s):  
Coal Seam ◽  
3D Model ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Coal Seams ◽  
Reservoir Properties ◽  
Well Design ◽  
New Development ◽  
Reservoir Type ◽  
High Production

Coal bed methane (CBM) is a kind of natural gas that generated from coal and disseminated organic matters during the stage of diagenesis and coalification, which mainly composed of methane and hosted in coal seam by free, adsorbed, and dissolved forms. Genetic, reservoir type and occurrence condition in CBM are different from traditional reservoir. And the high-produced development wells in CBM aiming to drill more coal seams with high quality therefore needs to be analyzed in the methods that are different from traditional reservoir. 3 important factors including the study on correlation and elevation depth of coal seam roof and floor in section and areal by using well-seismic ties, outcrop boundary based on coal mine data and distributions of CBM reservoir properties in 3D model are needed for high-produced development well analyze in CBM. Application in Australia CBM project shows this methodology is very successful for the development well design with high production.

scholarly journals Enhanced coal bed methane (ECBM) recovery: optimization of CBM production using different injected gas composition and rate for south sumatra CBM field, Indonesia

2018 ◽  
Vol 67 ◽  
pp. 03015 ◽  
Author(s):  
Abdul Wahid ◽  
Fariz Adriansyah Putra ◽  
Muhamad Taufiq Hidayat ◽  
Muhammad Yusuf
Keyword(s):  
Methane Production ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Co2 Injection ◽  
Technical Limitation ◽  
Recovery Method ◽  
National Production ◽  
The Difference ◽  
Cbm Production ◽  
Carbon Dioxide Co2

Indonesia, whose 453 TCF potential coal bed methane (CBM) reserves, rank the 6th largest CBM reserves around the world. However, the technical limitation is amongst the major issues slowing down the exploitation progress of the resources which current national CBM production only reach up to 1 MMSCFD. This paper provides a newly enhanced coal bed methane (ECBM) recovery method to improve the methane production. Scenarios of nitrogen (N2) and carbon dioxide (CO2) injection were used in this study to perform 25 years production simulation and compared with CBM primary production. Created hypothetical model based on the characteristic of coal seams CBM field in South Sumatra, Indonesia, was used to analyze the increasing methane production by using N2 and CO2 injection with different compositions and rates. The result observed about 3,52% incremental methane production by injecting N2 into CBM reservoir. In other words, this new method has an impact on enhancing the CBM national production, particularly South Sumatra CBM field, which could be useful for further CBM development in Indonesia. Mixture injection seemed to be unfavorable for the field due to the difference of gas mechanism. Thus

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