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USE OF ELECTRICAL RESISTIVITY METHODS FOR THE STUDY OF COAL SEAMS IN PARTS OF THE RANIGANJ COALFIELD (INDIA) *
Author(s) -
VERMA R. K.,
BANDOPADHYAY T. K.,
BHUIN N. C.
Publication year - 1982
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1982.tb00417.x
Subject(s) - geology , borehole , electrical resistivity and conductivity , coal mining , coal , mining engineering , coal basin , hydrogeology , vertical electrical sounding , igneous petrology , depth sounding , mineralogy , aquifer , petrology , geotechnical engineering , engineering geology , groundwater , seismology , volcanism , tectonics , oceanography , electrical engineering , engineering , waste management
A bstract The surface resistivity method has been used to study a few exposed coal seams located in the northwestern part of the Raniganj Coalfield (belonging to the Damodar Valley Gondwana basin), India. Different electrode configurations, viz., Wenner, two‐electrode and half‐Schlumberger, have been used with different electrode spacings in horizontal profiling. The vertical distribution of resistivity has been studied using Schlumberger configuration at different locations along the profile. Laboratory studies of resistivity (at partial to full water saturation conditions) and porosity of different coal, shaly sandstone and sandstone samples of the survey area had already been carried out before the field survey. The results indicated the presence of a good resistivity contrast between the coal seams and the surrounding formations. The field results did not bear this out: the resistivity responses of the coal formations on the profiles and sounding curves are not as clear as one would expect for such high contents. The Wenner profiles show a broad resistivity anomaly over the coal seams. Two‐electrode profiles are less noisy than Wenner profiles. Sharp peaks have been observed over the coal seams. The half‐Schlumberger configuration seems the best: all the coal seams and their edges can be accurately outlined on the resistivity curves. Borehole data close to the profile have been used for correlating the field results. There is good agreement with vertical electrical soundings.