The enrichment characteristics and geological controlling factors of coalbed methane occurrence in Laochang area, Yunnan Province

2012 ◽  
Vol 18 (4) ◽  
pp. 355-361 ◽  
Author(s):  
Cai-fang Wu ◽  
Zhao-ying Chen ◽  
Cong Wang ◽  
Wei Jiang
Keyword(s):  
Coalbed Methane ◽  
Yunnan Province ◽  
Controlling Factors ◽  
Enrichment Characteristics

Analysis of Ore-Controlling Factors and Prospecting Potential of the Luziyuan Lead-Zinc Deposit in West of Yunnan

2013 ◽  
Vol 807-809 ◽  
pp. 2197-2200
Author(s):  
Zhi Cai Xiao ◽  
Ming Guo Deng
Keyword(s):  
Yunnan Province ◽  
Geological Structure ◽  
Controlling Factors ◽  
Horizontal Distance ◽  
Ore Formation ◽  
Zinc Deposit ◽  
Deep Fault ◽  
North East ◽  
Zone Control ◽  
Lead Zinc

Luziyuan lead-zinc deposit located in Fengwei, Zhenkang,Yunnan Province, at the direction of 140°, horizontal distance is about 10km. The deposit closely related to acidic magmatism and geological structure. According to the latest exploration results of Yunnan Geological Survey, the amount of lead-zinc resources is 280 million tons, it is super-mega deposit. Mineralization factors as tectonics, deep fault, concealed rock, ore formation and surface north-east trending fault zone control the formation of the deposit. Gravity abnormal, magnetic abnormal, geochemical abnormal and associated mineralization of the mine relate to prospecting potential.

scholarly journals Study on geological controls and enrichment models of coalbed methane in the Wuwei Basin in eastern North Qilian, northwestern China

2018 ◽  
Vol 37 (1) ◽  
pp. 429-452
Author(s):  
Wenchao Shen ◽  
Longyi Shao ◽  
Wenguang Tian ◽  
Gang Chen ◽  
Fei Chen ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Sedimentary Environment ◽  
Controlling Factors ◽  
Gas Content ◽  
Methane Formation ◽  
Coal Seams ◽  
Mineral Contents ◽  
The North ◽  
Taiyuan Formation ◽  
Lagoon Environment

The Wuwei Basin is located in the Gansu Corridor, which has abundant coalbed methane resources of 2.75 × 1011 m3. However, a low degree of coalbed methane exploration exists, and only a few wells have been drilled in local regions due to insufficient understanding of coalbed methane enrichment and its main controlling factors. This study analyzed the controlling factors of coalbed methane enrichment, including coal reservoir characteristics, hydrogeological conditions, and the original sedimentary environment of the coal-bearing strata. The results showed that the main coal seams were developed in the Taiyuan Formation, and were mostly concentrated in the Yingpan Sag in the south and the Ermahu Sag in the north of the study area. The macrolithotype of the coals in this basin was mainly semi-bright coal with a medium to high rank. Coal macerals were mainly vitrinite, ranging between 65.1% and 91.6% (averaged 81.70%), followed by liptinite, ranging between 1.9% and 29.5% (averaged 8.82%), and inertinite, ranging between 0.2% and 16.5% (averaged 3.66%). Mineral contents varied from 2.5% to 15.1% (averaged 6.16%). The macrolithotype and microlithotype of the Taiyuan Formation coals were favorable for coalbed methane formation. Through comparative analysis of moisture content, ash yield, gas content, and coal-forming sedimentary environments, it was found that the coal formed in the lagoon environment had a higher gas content and lower ash yield than that of the coal formed in the tidal flat environment. The high contents of total dissolved solids in aquifers around coal seams (1.75–16.70 g/L) reflected the closed hydrodynamic environment and were favorable for the preservation of coalbed methane in the Yingpan Sag. Considering various controlling factors (i.e., structure, sedimentation and hydrogeology), three coalbed methane enrichment models were proposed. The model of coalbed methane enrichment in the synclinorium was the most favorable for the enrichment of coalbed methane in the Yingpan Sag.

Low-Rank Coalbed Methane Enrichment Characteristics in the Eastern Zone of Junggar Basin

2015 ◽  
Vol 1092-1093 ◽  
pp. 1416-1419
Author(s):  
Cheng Hua Ou ◽  
Chao Chun Li ◽  
Jian He ◽  
Song Yi Hou
Keyword(s):  
Coalbed Methane ◽  
Field Tests ◽  
Junggar Basin ◽  
Low Rank ◽  
Low Rank Coal ◽  
Eastern Zone ◽  
Practical Guidance ◽  
Enrichment Characteristics

The Eastern Zone of Junggar Basin is a typical and favorable low-rank coal CBM gathering area. This paper firstly, based on a large number of laboratory and field tests, respectively discusses CBM generating and bearing features, and sealing properties of the CBM reservoir’s top and bottom rocks of this zone, and reveals the distinctive low-rank CBM enrichment characteristics and laws within this zone. The results here will provide practical guidance for the whole basin’s low-rank CBM investigation and exploration, and impact the understanding of other low-rank CBM resources in China.

Analysis of Coalbed Methane (CBM) Enrichment and Main Controlling Factors in Southern Junggar Basin

2013 ◽  
Vol 848 ◽  
pp. 251-254
Author(s):  
Xiang Hao Wang ◽  
Yan Bin Wang ◽  
Jing Jing Fan ◽  
Jin Wang ◽  
Cheng Long Liu
Keyword(s):  
Coalbed Methane ◽  
Atmospheric Precipitation ◽  
Junggar Basin ◽  
Controlling Factors ◽  
Water Soluble ◽  
Gas Content ◽  
Runoff Water ◽  
Main Controlling Factors ◽  
Diffusion Pattern ◽  
Using Data

Using data analysis and comparative analysis, the distribution of Coalbed methane (CBM) gas content in southern Junggar were analyzed on the basis of the southern Junggar Basin coalfield geological data, and the main controlling factors of CBM accumulation were studied. The results show that, Gas content ranges from 2cm3/g to 15cm3/g, which overall is highest in central and eastern and becomes progressively smaller in trend of westward. The study area has many characteristics, such as Multi-seam, large coal seam thickness, mainly Fine-grained clastic rock, which is conducive to the enrichment of the CBM. Study area belongs to confined aquifer of low water-richness and receives the supply of atmospheric precipitation and river. In the coal seams within a certain depth formed Runoff water and the CBM diffusion pattern of desorption - diffusion - transport - water soluble gas runoff, which are not conducive to the enrichment of the CBM.

Research on the Controlling Factors and Grate Prediction of the Output of Pulverized Coal in Hancheng Block, Eastern Ordos Gas Field

2013 ◽  
Vol 734-737 ◽  
pp. 1460-1463 ◽  
Author(s):  
Xian Yue Xiong ◽  
Dai Yong Cao ◽  
Ming Xun Jie ◽  
Yong Bai ◽  
Xue Shen Zhu ◽  
...  
Keyword(s):  
Coal Seam ◽  
Mechanical Strength ◽  
Coalbed Methane ◽  
Controlling Factors ◽  
Pulverized Coal ◽  
Comprehensive Treatment ◽  
Root Mean Square Amplitude ◽  
Gas Field ◽  
Coalbed Methane Production ◽  
Coal Petrography

According to the 2012s workover treatment statistic in the Hancheng block, the eastern Ordos gas field, the workover caused by pulverized coal accounts for 41.8% of the total, which has seriously affected the continuous and stable drainage. This is one of the main factors which constraint coalbed methane production yield. In this paper, geological factors including the composition of coal petrography, the mechanical strength of coal petrography and coalbody structure destruction and engineering factors including drilling, fracturing and drainage were analyzed to study on the controlling factors on the output of pulverized coal. We conclude that the determinant on output of pulverized coal is the nature of coal seam, however engineering factors cause the output of pulverized coal directly. The root-mean-square amplitude attribute analysis was first used to display the mechanical strength of coal seam. Based on the result, we made the prediction about the possibility of the output of pulverized coal and divided the studying area into four grades. The research on the controlling factors and the prediction of the output of pulverized coal could provide the basis for the prevention and comprehensive treatment of pulverized coal.

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