Coalbed methane exploration and development. Terms and definitions

2015 ◽  
Keyword(s):  
Coalbed Methane ◽  
Exploration And Development

Geological Controls of the Coalbed Methane (CBM) Enrichment in the Zhengzhuang Coal Zone, Southern Qinshui Basin, China

2012 ◽  
Vol 616-618 ◽  
pp. 234-239 ◽  
Author(s):  
Jun Qian Li ◽  
Da Meng Liu ◽  
Yan Bin Yao ◽  
Yi Dong Cai ◽  
Xiao Qain Guo ◽  
...  
Keyword(s):  
Coal Seam ◽  
Coalbed Methane ◽  
Adsorptive Capacity ◽  
Qinshui Basin ◽  
Coalbed Gas ◽  
Southern Qinshui Basin ◽  
Exploration And Development

For finding out favorable coalbed methane development districts, the evaluation of geological controls of CBM distribution and accumulation is essential during CBM exploration and development. In this paper, the No. 3 coal seam in the Zhengzhuang coal zone located at southern Qinshui Basin, China, was selected as a focus for comprehensively evaluating geological controls of CBM. The findings of this study are: (1) Coalbed gas contents increase with increasing mudstone roof thickness (ranging from 0-9 m), and will always be as high as 20 m3/t in the coal reservoirs with the mudstone roof thickness greater than about 9 m. (2) The weak transmission and stagnant coalbed water are favorable for CBM accumulation in coal reservoirs resulting from the typical hydraulic preservation of CBM. (3) High coalbed gas contents will commonly occur in vitrinite-rich and low-ash yield coals with high CH4 adsorptive capacity.

scholarly journals Prediction of Coalbed Methane Production Based on BP Neural Network

2019 ◽  
Vol 131 ◽  
pp. 01059
Author(s):  
Tianxiang Zhang ◽  
Yifang Tang ◽  
Jianjun Wu ◽  
Zixi Guo ◽  
Bing Li
Keyword(s):  
Neural Network ◽  
Bp Neural Network ◽  
Methane Production ◽  
Coalbed Methane ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Correlation Degree ◽  
Coalbed Methane Production ◽  
Exploration And Development ◽  
Production Prediction

The low average daily gas production per well and the poor economic benefit of exploration and development have become the main problems restricting the exploration and development of coalbed methane in China. Combining multiple coal seam geological parameters to predict the high-yield area of the block can not only provide guidance for the exploitation of coal-bed methane, but also bring enormous economic benefits. Aiming at the difficulty of coalbed methane dessert discrimination and production prediction, a method of coal-bed methane production prediction based on BP neural network is proposed in this paper. Starting from the average daily production of coalbed methane single well, we use the method of grey correlation degree to get the main controlling factors of coalbed methane production. For the main control factors, we use BP neural network with high fitting accuracy and get a good prediction result.

scholarly journals Characteristics of tectonic deformation in the Daning-Jixian region, eastern Ordos Basin: Implications for the exploration and development of coalbed methane

2018 ◽  
Vol 37 (3) ◽  
pp. 907-921
Author(s):  
Changgui Li ◽  
Bo Jiang ◽  
Wei Ju ◽  
Guoxi Cheng ◽  
Yu Song
Keyword(s):  
Coalbed Methane ◽  
Ordos Basin ◽  
Methane Content ◽  
Tectonic Deformation ◽  
Lower Permian ◽  
Burial Depth ◽  
The West ◽  
Eastern Margin ◽  
Middle Slope ◽  
Exploration And Development

Eastern Ordos Basin is an important region for the development of Carboniferous-Permian coalbed methane in China; however, there are significant differences of the coalbed methane exploration and development prospects among different regions within eastern Ordos Basin due to the multiple tectonic movements. In this study, the No. 5 coal of the Shanxi Formation of the Lower Permian in the Daning-Jixian region was selected for analysis. The influences of structures on coalbed methane content and permeability of coalbed methane reservoirs in the Daning-Jixian region were discussed and the favorable target areas for coalbed methane development were determined based on the analysis of tectonic characteristics and evolution. The results indicate that the main structures in this region extend in the NE–NNE direction with distinct E-W-trending zoning, which can be specifically divided into, from the east to the west, the fault depression zone in basin margins, the gentle fold zone in basin slopes, and the gentle slope zone. The formation and evolution of the structures in this area are primarily formed during the Indosinian, the Yanshanian, and the Himalayan movement, and the tectonic movement during the Middle Yanshan Period is critical for the formation of the structural frameworks. The coalbed methane contents in the No. 5 coal increase from the east to the west; therefore, low gas contents are found in the eastern margin zone, while the Yaoqu-Wucheng zone of middle slope belt displays high coalbed methane contents. The permeability is relatively high in the eastern margin zone and in the Mingti-Yangjiahe region of the middle slope zone, where there exist relatively strong structural deformations. The Guyi and Mingzhu blocks are selected as the favorable target areas for coalbed methane exploitation by a comprehensive analysis of burial depth, coalbed methane content, and the permeability.

scholarly journals Multiple Influences of Paleogeography, Sequence Stratigraphy, and Fold Structure on Coalbed Methane Accumulation in the Lopingian (Late Permian) of Junlian Coalfield, SW China

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Xiangdong Gao ◽  
Wuzhong Li ◽  
Yiming Yang ◽  
Kaigui Yin ◽  
Shihao Zhou
Keyword(s):  
Sequence Stratigraphy ◽  
Coalbed Methane ◽  
Carbonate Platform ◽  
Sedimentary Environment ◽  
Tidal Flats ◽  
Gas Content ◽  
Coal Seams ◽  
Third Order ◽  
Fold Structure ◽  
Exploration And Development

Junlian coalfield is one of the main targets for coalbed methane (CBM) exploration and development in the southwest China. Based on field geological survey, core observation, gas content statistics, coal maceral composition, vitrinite reflectance ( R O ), proximate analysis and trace element test, lithological types, lithofacies, sedimentary environment, and structural analysis, this research established the sequence stratigraphy frame, revealed the plane distribution characteristics of sedimentary facies, and defined CBM accumulation mode. The results show that six rock types were identified and further subdivided into twenty lithofacies types. Four types of sedimentary systems such as alluvial plains, delta, lagoon-tidal flat, and carbonate platform were summarized according to their combination characteristics. Additionally, 12-14 fourth-order sequences and three third-order sequences CSI, CSII, and CSIII were divided, and a sequence stratigraphic framework of the Lopingian coal-bearing series was established. Among them, the features of third-order sequence CSIII paleogeography from west to east are alluvial plains, deltas, lagoon-tidal flats, and limited carbonate platforms. Thick coal seams are mainly developed in the sedimentary environment of tidal flats, delta plains, and floodplains behind banks. Closely related to coal seam thickness, gas contents of Lopingian coal seams are generally higher than 8 m3/t, except the low level in northwest and partial denudation areas. CBM accumulation is significantly controlled by the fold structure, and the hydraulic plugging effect makes the syncline core favorable for CBM accumulation. Furthermore, favorable geostress conditions enable the secondary anticline to become a favorable area for CBM accumulation when the sealing conditions are better. This research will provide a theoretical guide for the exploration and development of CBM in the study area.

scholarly journals The evaluation of potential for the exploration and development of coalbed methane resources based on an improved uncertainty measure optimization model

2018 ◽  
Vol 37 (1) ◽  
pp. 315-331 ◽  
Author(s):  
Jie Fang ◽  
Hujun He ◽  
Le An ◽  
Gang Jin
Keyword(s):  
Coalbed Methane ◽  
Measure Theory ◽  
Influence Factors ◽  
Uncertainty Measure ◽  
Practical Application ◽  
Coal Basin ◽  
Entropy Weight ◽  
Qinghai Province ◽  
Using Data ◽  
Exploration And Development

The recognition criteria of credible degree in uncertainty measure theory are improved based on the concept of distance discriminant and used to evaluate the potential for exploration and development of coalbed methane. This paper uses a systematic approach to establish a mathematical model based on entropy weight and improved uncertainty measure theory. In this model, uncertainty influence factors were analyzed qualitatively and quantitatively using data for the Muli coalfield of Qinghai province, China. The uncertainty measure function is based on experimental data, and the weight of index is determined by entropy weight theory. Optimization credible degree recognition criteria were used to evaluate the potential for coalbed methane exploration and development of six mines in the Muli coalfield. These data indicate that evaluation results obtained using entropy weight and improved uncertainty measure theory have practical application and can effectively assess the exploration and development potential of coalbed methane in a coal basin.

scholarly journals Geochemical characteristics and genesis of coalbed methane in Baode area on the eastern margin of Ordos Basin

2020 ◽  
Vol 206 ◽  
pp. 01019
Author(s):  
Weiqiang Hu ◽  
Xin Chen ◽  
Yangbing Li ◽  
Litao Ma ◽  
Wang Yuesheng ◽  
...  
Keyword(s):  
Coal Seam ◽  
Coalbed Methane ◽  
Ordos Basin ◽  
Mean Value ◽  
Geochemical Characteristics ◽  
Coal Bed ◽  
Mass Reproduction ◽  
External Water ◽  
Systematic Understanding ◽  
Exploration And Development

The degree of coalbed methane exploration and development now in Baode area is relatively low. The lack of systematic understanding of the formation of coalbed methane in this area restricts the further exploration and development of coalbed methane. Based on the comprehensive study on the geochemical characteristics of coalbed methane components, hydrocarbon isotopes, water quality detection and hydrogen oxygen isotopes in coal seam in Baode area, the origin of coalbed methane in this area is discussed. According to the research, the hydrocarbon gas in the composition of coalbed methane in Baode area is mainly CH4 and a small amount of ethane. Both of their drying coefficients are more than 0.99, so they belong to the extremely dry coal bed methane. The value of δ13C(CH4) coalbed methane is on the low side and the value of δ13C(CO2) is on the high side, the mean value of δD(CH4) is -247.5‰, which shows the characteristics of terrestrial biogas. The water produced by coal seam is weak alkaline and belongs to the NaHCO3 type of water. which is similar to the surface water ion composition, salinity , δD(H2O) and δ18O(H2O) values, indicating that the hydrodynamic conditions of the coal seam in this area are more active. There is a recharge of external water, which is benificial to the mass reproduction of CH4 producing bacteria and the formation of biogas. In this area, the coalbed methane is a mixture of thermogenic and biological genesis, mainly composed of thermogenic gases and supplemented by biogenic gases generated through carbon dioxide reduction.

Analysis of Critical Restricting Factors and Proposals for Coabed Methane Development in China

2011 ◽  
Vol 361-363 ◽  
pp. 848-852
Author(s):  
Jian Yun ◽  
Feng Yin Xu ◽  
Wen Ting Zeng ◽  
Ning Ning Zhong ◽  
Jia Lin Wang
Keyword(s):  
Coalbed Methane ◽  
Low Rank ◽  
Atmospheric Environment ◽  
Coal Bed ◽  
Energy Structure ◽  
Low Carbon ◽  
Geological Conditions ◽  
Well Yield ◽  
Single Well ◽  
Exploration And Development

"Clean technology and low carbon" is becoming a new trend of energy development worldwide. To speed up Coalbed Methane (CBM) exploration and development is of significant importance to reduce coal mine gas accidents, to protect atmospheric environment and to improve energy structure. Greater efforts have been exerted to CBM development, and three major CBM enterprises emerged. Qinnan, Lu’an and Sanjiao cooperation modes are developed to promote the coordinated development of gas extraction and coal mining. Many exploration and development technologies, tailored for various rank coal methane and for different geological conditions, are developed. Exploring technology, in CBM buried deeper than 800m and in low-rank coal bed methane development, has achieved substantial breakthrough. Moreover, Qinnan, Hancheng, Daning-jixian and Baode four favorable blocks are all adjacent to the major existing pipelines. China is rich in CBM resources, with great potentials and promising prospects, however, two factors of technology and management are still constraining the development of China’s CBM. Based on the analysis of the key factors, four following suggestions are proposed: to adjust strategies based on the resource distribution, to further coordinate governmental policies and entrepreneur performance, to strive to make technological breakthroughs in increasing single well yield and in promoting integrated economic efficiency, to establish a unified information platform to avoid disorderly competition and repeated investment.

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