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An analysis of reservoir conditions and responses in longwall panel overburden during mining and its effect on gob gas well performance.

Authors
Schatzel-SJ; Karacan-CÍ; Dougherty-H; Goodman-GVR
Source
Eng Geol 2012 Feb; 127:65-74
NIOSHTIC No.
20040449
Abstract
NIOSH conducted a cooperative research study to provide direct measurements of changing reservoir conditions in longwall panel overburden. The field measurements documented changes in permeabilities, methane concentrations, fluid pressures, and the effects of adjacent gob gas ventholes (GGVs) on NIOSH boreholes drilled in the study panel. Three different stratigraphic horizons were monitored by the NIOSH boreholes. Results indicated that the gob gas venthole fracture network formed 24 to 46m (80 to 150 ft) ahead of the mining face. Overburden permeabilities within the same overburden test zones were ~1md prior to undermining, increasing to hundreds or thousands of md during undermining. Permeabilities measured seven months after undermining showed additional increases. The relationship between changing reservoir conditions, longwall face position, and surface movement is discussed. Recommendations are made to optimize GGV performance by evaluating changes in subsidence produced by mining, resulting in rock stresses that substantially influence induced fracture permeability. Mechanisms to account for the observed changes in reservoir conditions are reported.
Keywords
Longwall-mining; Underground-mining; Methanes; Ventilation; Gases; Mine-gases; Rock-mechanics; Author Keywords: Underground mining; Ventilation; Explosions; Subsidence
Contact
Steven J. Schatzel, National Institute for Occupational Safety and Health, Office of Mine Safety and Health Research, PO Box 18070, Pittsburgh, PA, 15236
CODEN
EGGOAO
CAS No.
74-82-8
Publication Date
20120224
Document Type
Journal Article
Email Address
zia6@cdc.gov
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
B03142012
ISSN
0013-7952
NIOSH Division
OMSHR
Source Name
Engineering Geology
State
PA
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