Coal reservoir characteristics and coalbed methane resource assessment in Huainan and Huaibei coalfields, Southern North China

et al. 2018

Sci. China Mater.

Here, PbCrO 4 nanorods, a commonly used and low-cost yellow pigment, was synthesized via a simple precipitation reaction and can serve as a highly efficient oxygen production and photodegradation photocatalyst. The obtained PbCrO 4 nanorods exhibit excellent stability and photocatalytic performance for O 2 evolution from water. The production rate is approximately 314.0 μmol h −1 g −1 under visible light, and the quantum efficiency is approximately 2.16% at 420±10 nm and 0.05% at 600±10 nm. In addition, the PbCrO 4 shows good degradation performance for methylene blue, methyl blue, methyl orange and phenol under visiblelight irradiation. These results indicate that it is potential to fabricate an effective, robust PbCrO 4 photocatalyst by transforming heavy-metal pollutants Pb(II) and Cr(VI) into a highly efficient O 2 evolution and photodegradation material. This strategy which uses pollutant to produce clean energy and degrade contaminants is completely green and environmentally benign, and thus could be a promising way for practical environmental applications.

Section: Resultsmentioning

confidence: 91%

PbCrO4 yellow-pigment nanorods: An efficient and stable visible-light-active photocatalyst for O2 evolution and photodegradation

Zhang

et al. 2018

Sci. China Mater.

“…CBM tends to concentrate in the syncline and dissipate in the anticline and normal fault zone [1,26]. In the study area, anticline is less developed, CBM accumulation is mainly controlled by the Fukang syncline and Ergonghe syncline.…”

Section: Geological Structure Controlsmentioning

confidence: 99%

“…Coalbed methane is a type of unconventional gas resource [1], the exploration and exploitation of which have been intensively implemented [2][3][4][5][6][7]. Gas content is critical for CBM exploration and can be affected by multiple factors including structural type, lithology, thickness, coal rank, and burial depth [8].…”

Section: Introductionmentioning

confidence: 99%

Gas Content Evaluation of Coalbed Methane Reservoir in the Fukang Area of Southern Junggar Basin, Northwest China by Multiple Geophysical Logging Methods

Cai

et al. 2018

Energies

Self Cite

Abstract:To study the gas potential of coalbed methane (CBM) in the Fukang area, southern Junggar Basin (SJB) of North China, different methods including multiple geophysical logging, the Kim method with proximate analysis data, and Langmuir adsorption were used to evaluate the gas content. Furthermore, the geological controls on gas content were evaluated. One hundred sixteen CBM wells with geophysical logging and 20 with field-measured gas content were adopted to assess the gas content in the Fukang area of SJB, NW China. The results show that the two geophysical logging variables (DEN and CNL) were favorable for evaluating the gas content due to the perfect correlation with the measured gas content. The gas content varies from 4.22 m 3 /t to 16.26 m 3 /t, and generally increases with increasing burial depth. The gas content in coal seams along the synclinal axis is significantly higher than that along the synclinal wing in the west zone. In the east zone, the gas content of the westward is higher than that of the eastward because of the fault coating effect by reverse fault. Generally, the gas content of the SJB is in the order of syncline > surrounding reverse fault > slope of syncline > slope of anticline > central of reverse fault, if only geological structure features are considered. The favorable areas for CBM concentration appear to be a composite gas controlling result of multiple geological factors. Two typical geological scenarios with low gas content and high gas content were revealed. In the Fukang area of SJB, the low gas content is mainly due to the normal fault and roof lithology of sandstone. The most favorable area of high gas content for CBM exploration and development is in the northeast, where reversed fault, synclinal axis, mudstone roof lithology, and burial depth coincide with high gas content.

“…The Zhangji Coal Mine in Huainan City, Anhui Province, China has a length of 14.6 km, a width of 4.0 km and covers an area about 58.4 km2 (Liu et al, 2009b). The location of the mine is shown in Figure 1.…”

Section: Geological Settingmentioning

confidence: 99%

Relationships between Trace Element Abundances and Depositional Environments of Coals from the Zhangji Coal Mine, Anhui Province, China

Energy Exploration & Exploitation

Sun

et al. 2013

Coal characteristic and trace elements of 254 coal samples from Zhangji Coal Mine, Anhui Province, China were studied. Compared with average concentrations of trace elements in Chinese, U.S. and world coals, the coals from Zhangji mine contains a higher concentrations of Co, Cu, Sr and Sc and lower concentrations of Ba, Bi, Mn, Cd, Mo and Zn. The concentrations of B and the Sr/Ba ratios showed that the Permian coal-bearing sequences of the coal mine were developed from a brackish-water influenced lower delta plain (No. 6-2 coal) to a freshwater influenced fluvial upper delta plain (No. 9-1 coal) and suffered frequent marine transgression and regression, which may cause many thin and unstable coal seams. The vertical variations of trace elements in different coal seams indicate that the concentrations of most trace elements in coals are significantly related with depositional environments. Some trace elements could be utilized in coal seam correlation.