The bioconversion of coal to methane in the San Juan Basin, New Mexico, was investigated. Production waters were analyzed via enrichment studies, metabolite-profiling, and culture-independent methods. Analysis of 16S rRNA gene sequences indicated the presence of methanogens potentially capable of acetoclastic, hydrogenotrophic, and methylotrophic metabolisms, predominantly belonging to the Meth...

Coal-bearing sediments are major reservoirs of organic matter potentially available for methanogenic subsurface microbial communities. In this study the specific microbial community inside lignite-bearing sedimentary basin in Germany and its contribution to methanogenic hydrocarbon degradation processes was investigated. The stable isotope signature of methane measured in groundwater and coal-r...

It is notable that over the past decade, proven reserves of natural gas have dramatically increased as higher prices and advances in technology have turned previously unrecoverable resources into major sources of domestic production. Moreover, the decline in crude oil reserves has significantly slowed over the past decade. Therefore, there would be an end to the conventional hydrocarbon resourc...

Production practice has shown that not all low-production coalbed methane (CBM) wells can be reconstructed into high-production through secondary stimulation, so it is necessary and timely to establish an evaluation index system, form method, evaluate the reconstruction potential of wells. Based on development CBM in southern Qinshui Basin, this paper analyzes influencing factors low production...

We report laboratory experiments to investigate the role of gas desorption, stress level and loading rate on the mechanical behavior of methane infiltrated coal. Two suites of experiments are carried out. The first suite of experiments is conducted on coal (Lower Kittanning seam, West Virginia) at a confining stress of 2 MPa and methane pore pressures in the fracture of 1 MPa to examine the rol...

Abstract Based on the fact that production of deep coalbed methane (CBM) in Yushe-Wuxiang Block is lower than expected, paper carried out uniaxial strength test and triaxial rheological coal measure strata reservoirs (mudstone, coal, sandstone their composite sample) deeper 1300 m block. In test, it found stress–strain process rock sample was similar to shallow one. The brittleness more obvious...

Numerical simulation is an efficient method to quantitatively describe the reservoir dynamics of coalbed methane (CBM) reservoirs. The ideal steeply inclined model (ISIM), assumed be a plate, has been widely applied in steep modeling, although ISIM cannot accurately reflect actual geological conditions. In this paper, CBM production and reservoirs using (ASIM) were compared, taking coal Fukang ...

The fluid flow behaviors during the production of coalbed methane (CBM) are generally restricted by pre-existing natural fractures in coal seams. To better understand effect micro-fracture morphology on capability, nine coals collected from Ordos Basin were subjected to optical microscope observations obtain micro-fractures morphology. And then, box-counting method (BCM) was used quantify compl...

Hydraulic fracturing is the main technical means for reservoir stimulation of coalbed methane (CBM) vertical wells. The design fluid volume (FFV) mainly through numerical simulation, and simulation method does not fully consider water block damage caused by leakage into reservoir. In this work, variance analysis was used to analyze production data 1238 CBM wells in Fanzhuang Zhengzhuang Qinshui...

Many observational datasets of emissions, including emissions from the oil and gas sector, follow heavy-tailed distributions, for which a small fraction of the measured emitters are much larger than more typical emitters, and account for a large fraction of the total measured emission. Such distributions are problematic, because they are expected to exhibit large, negatively biased sampling err...