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New directions in exploration geophysics. Part 1
62A
A digital strip monitoring system has been developed to detect pit wall failure. It consists of brittle strips which are buried in walls and linked electrically to a monitor. If the wall moves the strips break and show up on the monitor. The system is primarily to study slip mechanisms.
Planning, geotechnical and structural mapping 832250 INTERACTIVE COMPU'r~R SYSTEM TO PREPARE BOREHOLE DATA FOR COAL SEAH MAPPING Hegde, S S; Berger, J T; Fe~nn, J C Min Engng, V34, N!0, Oct 1982, P1486-1492 832251 G E C ~ Y OF A LARGE-SCALE NITROGEN GAS HYDRAULIC FRACTURE FORMED IN DEVONIAN SHALE: AN E ~ OF FRACTURE MAPPING WITH TILTM~'['~S Evans, K; Holzhausen, G; Wood, D M Soc Petr Emgr J, V22, NS, Oct 1982, P755-763
Core recovery, logging, probing, boring and sampling 832252 MEI~ODS FOR CORRECTING POROSITY DATA IN A GYPStNBEARING CARBONATE RESHRVOIR Tilly, H P; Gallagher, B J; Taylor, T D J Pet Technol, V34, Oct 1982, P2hAg-2454 Describes methods for special, low-temperature care analysis and log analysis to obtain cc~rect porosity measurements despite significant quantities of gypsum present in the samples.
Geophysical techniques 832253 BRITISH TRY NEW WAY TO FIND FAULTS Heywood, P Coal Age, V87, NT, July 1982, P I 1 4 - I 1 8 The B r i t i s h N a t i o n a l Coal Board have been experimenting with specially adapted seismic surveying methods in c ~ d ~ to detect faults occurring in coal seams in underground mines. 832254 NEW DIRECTIONS IN EXPLORATION GEOPHYSICS. PART 2 Lewis, A Engng Min J, V183, N9, Se~t 1982, P152-155 Describes 3 types of magnetometer used in magnetic stu-veys: proton precession, optically pumped and flUxgate magnetometers. Gradiometers
are also used extensively and ~rovlde information on location, shape and depth of composite anomalies. See item 832255 for Port !. 832255 NEW DIRECTIONS IN ~/2~LORATION GEOP~Y~31C~< P~qT ! Lewis, A Engng Min J, V183, ~ , Aug 198~, P55-61 Reviews recent developments in electromagnetic and induced polarisation methods. These allow deeper probing and resolution of complex orebodies. See item 832254 for P ~ t 2. 832256 sPECTRAL ANALYSIS OF COAL-MINE ROOF VIBRATIONS. TECHNICAL NOTE Palmer, E P; Czirr, J B Min Engng, V34, NI0, Oct 1982, P1477-1479 A spectrum analyzer was used to examine vibration frequencies produced by tapping a mine roof. It is shown that such s method can be used to distinguish between 'solid' and 'drummy' roofs, but reveals little about roof-slab thickness. 832257 ACOUSTIC EMISSIONS AS A TOOL FOR HYDRAULIC FRACTURE LOCATION: EXPERIENCE AT THE FENTON HILL HOT DRY ROCK SITE Albright, J N; Pearson, C F Soc Petr Engr J, V22, N4, Aug 1982, P523-530 Microearthquakes with magnitudes ranging between -6 and -2 often occur during hydraulic stlmtklations at the Fenton Hill hot dry rock geothermal reservoir. These events are USed to locate the resulting hydraulic fractures, to follow the movement of high-pressure water in the reservoir and to estimate the effective permeability of the reservoir. The large shear- to compressional-wave-amplitude ratio st~gests that the microearthquakes result from shear failure. 832258 APPLICATION OF THE AEROMAGNETIC GRADIO~mI'~ SURVEY TECHNIQUE TO GOLD EXPLORATION IN THE VAL D'OR MINING CA~P, 0UEBEC HOod, P; Irvine, J; Hansen, J Can Min J, Vl03, Ng, Sept 1982, P21-39 832259 IN-SEAM SEISMIC STUDIES FOR COAL EXPLORATION Wilson, R G; Scalfe, P H; Leung, L BHP Tech Bull, V26, N1, 1982, P10-13 Describes the development of in-seam selsmlc (ISS) explc~atlon techniques far locating discontinuities in underground workings, together with field trials.
A digital strip monitoring system has been developed to detect pit wall failure. It consists of brittle strips which are buried in walls and linked electrically to a monitor. If the wall moves the strips break and show up on the monitor. The system is primarily to study slip mechanisms.
Planning, geotechnical and structural mapping 832250 INTERACTIVE COMPU'r~R SYSTEM TO PREPARE BOREHOLE DATA FOR COAL SEAH MAPPING Hegde, S S; Berger, J T; Fe~nn, J C Min Engng, V34, N!0, Oct 1982, P1486-1492 832251 G E C ~ Y OF A LARGE-SCALE NITROGEN GAS HYDRAULIC FRACTURE FORMED IN DEVONIAN SHALE: AN E ~ OF FRACTURE MAPPING WITH TILTM~'['~S Evans, K; Holzhausen, G; Wood, D M Soc Petr Emgr J, V22, NS, Oct 1982, P755-763
Core recovery, logging, probing, boring and sampling 832252 MEI~ODS FOR CORRECTING POROSITY DATA IN A GYPStNBEARING CARBONATE RESHRVOIR Tilly, H P; Gallagher, B J; Taylor, T D J Pet Technol, V34, Oct 1982, P2hAg-2454 Describes methods for special, low-temperature care analysis and log analysis to obtain cc~rect porosity measurements despite significant quantities of gypsum present in the samples.
Geophysical techniques 832253 BRITISH TRY NEW WAY TO FIND FAULTS Heywood, P Coal Age, V87, NT, July 1982, P I 1 4 - I 1 8 The B r i t i s h N a t i o n a l Coal Board have been experimenting with specially adapted seismic surveying methods in c ~ d ~ to detect faults occurring in coal seams in underground mines. 832254 NEW DIRECTIONS IN EXPLORATION GEOPHYSICS. PART 2 Lewis, A Engng Min J, V183, N9, Se~t 1982, P152-155 Describes 3 types of magnetometer used in magnetic stu-veys: proton precession, optically pumped and flUxgate magnetometers. Gradiometers
are also used extensively and ~rovlde information on location, shape and depth of composite anomalies. See item 832255 for Port !. 832255 NEW DIRECTIONS IN ~/2~LORATION GEOP~Y~31C~< P~qT ! Lewis, A Engng Min J, V183, ~ , Aug 198~, P55-61 Reviews recent developments in electromagnetic and induced polarisation methods. These allow deeper probing and resolution of complex orebodies. See item 832254 for P ~ t 2. 832256 sPECTRAL ANALYSIS OF COAL-MINE ROOF VIBRATIONS. TECHNICAL NOTE Palmer, E P; Czirr, J B Min Engng, V34, NI0, Oct 1982, P1477-1479 A spectrum analyzer was used to examine vibration frequencies produced by tapping a mine roof. It is shown that such s method can be used to distinguish between 'solid' and 'drummy' roofs, but reveals little about roof-slab thickness. 832257 ACOUSTIC EMISSIONS AS A TOOL FOR HYDRAULIC FRACTURE LOCATION: EXPERIENCE AT THE FENTON HILL HOT DRY ROCK SITE Albright, J N; Pearson, C F Soc Petr Engr J, V22, N4, Aug 1982, P523-530 Microearthquakes with magnitudes ranging between -6 and -2 often occur during hydraulic stlmtklations at the Fenton Hill hot dry rock geothermal reservoir. These events are USed to locate the resulting hydraulic fractures, to follow the movement of high-pressure water in the reservoir and to estimate the effective permeability of the reservoir. The large shear- to compressional-wave-amplitude ratio st~gests that the microearthquakes result from shear failure. 832258 APPLICATION OF THE AEROMAGNETIC GRADIO~mI'~ SURVEY TECHNIQUE TO GOLD EXPLORATION IN THE VAL D'OR MINING CA~P, 0UEBEC HOod, P; Irvine, J; Hansen, J Can Min J, Vl03, Ng, Sept 1982, P21-39 832259 IN-SEAM SEISMIC STUDIES FOR COAL EXPLORATION Wilson, R G; Scalfe, P H; Leung, L BHP Tech Bull, V26, N1, 1982, P10-13 Describes the development of in-seam selsmlc (ISS) explc~atlon techniques far locating discontinuities in underground workings, together with field trials.