Geological controls on prediction of coalbed methane of No. 3 coal seam in Southern Qinshui Basin, North China

Cai, Yidong; Liu, Dameng; Yao, Yanbin; Li, Junqian; Qiu, Yongkai

doi:10.1016/j.coal.2011.08.009

Cited by 275 publications

(171 citation statements)

References 33 publications

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“…These observations are important for evaluating the hydrodynamics of the study area and for predicting how they can impact methane transport and emissions. Similar evaluations were made by Cai et al (2011) to assess geological controls for predicting coalbed methane accumulation and movement in the Southern Qinshui Basin, China. Their measurements showed that the ground-water movement in the basin is controlled by topography, precipitation, and tectonics.…”

Section: Sequentialmentioning

confidence: 98%

Analyses of geological and hydrodynamic controls on methane emissions experienced in a Lower Kittanning coal mine

Karacan¹,

Goodman²

2012

International Journal of Coal Geology

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This paper presents a study assessing potential factors and migration paths of methane emissions experienced in a room-and-pillar mine in Lower Kittanning coal, Indiana County, Pennsylvania. Methane emissions were not excessive at idle mining areas, but significant methane was measured during coal mining and loading. Although methane concentrations in the mine did not exceed 1% limit during operation due to the presence of adequate dilution airflow, the source of methane and its migration into the mine was still a concern. In the course of this study, structural and depositional properties of the area were evaluated to assess complexity and sealing capacity of roof rocks. Composition, gas content, and permeability of Lower Kittanning coal, results of flotation tests, and geochemistry of groundwater obtained from observation boreholes were studied to understand the properties of coal and potential effects of old abandoned mines within the same area. These data were combined with the data obtained from exploration boreholes, such as depths, elevations, thicknesses, ash content, and heat value of coal. Univariate statistical and principal component analyses (PCA), as well as geostatistical simulations and co-simulations, were performed on various spatial attributes to reveal interrelationships and to establish area-wide distributions.These studies helped in analyzing groundwater quality and determining gas-in-place (GIP) of the Lower Kittanning seam. Furthermore, groundwater level and head on the Lower Kittanning coal were modeled and flow gradients within the study area were examined. Modeling results were interpreted with the structural geology of the Allegheny Group of formations above the Lower Kittanning coal to understand the potential source of gas and its migration paths. Analyses suggested that the source of methane was likely the overlying seams such as the Middle and Upper Kittanning coals and Freeport seams of the Allegheny Group. Simulated ground-water water elevations, gradients of groundwater flow, and the presence of recharge and discharge locations at very close proximity to the mine indicated that methane likely was carried with groundwater towards the mine entries. Existing fractures within the overlying strata and their orientation due to the geologic conditions of the area, and activation of slickensides between shale and sandstones due to differential compaction during mining, were interpreted as the potential flow paths.

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Section: Sequentialmentioning

confidence: 98%

Analyses of geological and hydrodynamic controls on methane emissions experienced in a Lower Kittanning coal mine

Karacan¹,

Goodman²

2012

International Journal of Coal Geology

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“…It is 3.57 km long and 0.87km wide and covers an area of approximately 3.10km 2 . We collected borehole data from 51 wells within the work area e.g., drilling, logging, and fracturing data and 3D seismic data.…”

Section: Methodsmentioning

confidence: 99%

“…The Yanshan movement during the Jurassic and Cretaceous separated the basin from the North China Craton to form a complex NNE-SSW synclinal basin (Su et al, 2005;Cai et al, 2011;Zou et al, 2013). Currently, the Qinshui Basin is surrounded by the uplifts of the Taihang, Zhongtiao, Wutai, and Huoshan Mountains.…”

Section: Regional Structurementioning

confidence: 99%

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Differences in the Methane Contents in the Coalbed Methane Enrichment Region of the Southern Qinshui Basin, China

He¹

2017

Appl Ecol Env Res

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Abstract. The enrichment irregularity of coalbed methane has been a problem for exploration and development. Great differences exist in methane enrichment even between different wells within a region. To study the main factors and reasons controlling these differences, we selected a relatively mature development block within a coalbed methane enrichment region of the Southern Qinshui Basin, China. Using individual well data, 3D seismic data, and methane content data and considering the coalbed methane (CBM) reservoir as a closed system, we analysed the enrichment irregularity of CBM in coalbed 3# and the various geologic factors influencing the enrichment.The results show that the CBM reservoir formation resulted from an interaction of various geologic factors, the evolution process is irreversible, and all of these factors are subject to certain internal relationships. The enrichment is controlled by several factors, such as tectonic development, formation pressure, coalbed structure, properties of roof strata, and hydrogeological conditions. Among these, formation pressure and coalbed structure are the most likely factors to cause differences in methane contents. Burial depth affects formation pressure, which consequently affects the saturation level of CBM in its adsorption state. Moreover, the coalbed structure determines the development of the reservoir space.Larger reservoir space and higher coalbed pressure are more favourable for CBM enrichment and the best enrichment region appears where both factors correlate well,this is particularly obvious in synclinal areas. Furthermore, tectonic development controls the overall form of CBM reservoirs, fault development reduces methane content and the mudstone cap provides a trap condition for CBM accumulation.

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“…Horizontal wells drilled from both the surface and from internal mine workings provide the opportunity for higher levels of methane recovery in less time compared to traditional vertical wells (Diamond, 1977;Steven, 2011), while costs for horizontal holes range from only 1 to 4 times as much (Gentzis, 2009;Palmer, 2010). The coal in Qinshui Basin generally has a low permeability range from 0.1 to 3.0 mD (Cai and Liu, 2011), and the performance of anthracites in Qinshui basin are superior to most of other basins referenced in China, The first multilateral horizontal well was completed in December 2004 to extract methane from coal seams prior to mining in the Daning coal mine in Southern Qinshui Basin, China (Liu et al, 2011). Because of the high productivity and the relatively low price, approximately 200 multilateral horizontal wells are drilled presently.…”

Section: Introductionmentioning

confidence: 99%

Coalbed methane recovery from multilateral horizontal wells in Southern Qinshui Basin

Liu

Tang

Yin

2018

Adv. Geo-Energy Res.

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Citation:Liu, S., Tang Since 2006, more than 80 multilateral horizontal wells have been drilled in Panzhuang block, Southern Qinshui Basin. In this paper, 6 typical wells in a region are selected as an example. The thickness of coal, gas content, reservoir pressure, permeability, burial depth, and reservoir pressure conditions are analyzed. The practice shows that production by multilateral horizontal well declines from 43,111 m 3 /day per well in the 2 nd year to 25,126 m 3 /day per well in the 4 th year. The numerical simulation result shows that the lateral interference forms in Well QNP05 after two years of gas production, and the gas content is reduced to less than 8 m 3 /t within the controlled region after six years. The area of gas content was less than 8 m 3 /t after eight years of gas production is about 3.2 km 2 , which is about 76% of the controlled area of the six multilateral horizontal wells. The results indicate that multilateral horizontal wells contribute to high production rates at potentially profitable levels and can also serve as an effective tool for a high-rank CBM field drainage.

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Geological controls on prediction of coalbed methane of No. 3 coal seam in Southern Qinshui Basin, North China

Cited by 275 publications

References 33 publications

Analyses of geological and hydrodynamic controls on methane emissions experienced in a Lower Kittanning coal mine

Analyses of geological and hydrodynamic controls on methane emissions experienced in a Lower Kittanning coal mine

Differences in the Methane Contents in the Coalbed Methane Enrichment Region of the Southern Qinshui Basin, China

Coalbed methane recovery from multilateral horizontal wells in Southern Qinshui Basin

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