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Permeability acoustic logging (in French)
78A instantaneous mechanical parameter logging enhances groundwater drilling in fissured, permeable media
842339 Heat-sealable pouches for preserving rock cores Splettstoesser, J F. Hoyer, M C J Sediment Petrol V53, N2, June 1983 P674-675
842335 Imprint techniques in boreholes: application to rock mass investigation (In French) Heraud, H, Lavet, M lnt Assoc Engng Geol Bull N26-27, Dec 1982-June 1983, P89-93 (Paper to the Internatzonal Sympostum on Sod and Rock Investzgattons by In Sttu Testing, Parts, 18-20 May 1983 /
84234O Number of boreholes to measure the state of stress m-situ by overcoring Amadel, B Proc 24th US Symposium on Rock Mechanics, College Statwn, Texas, 20-23 June 1983 P87-98 Publ 4EG, 1983
The imprint of discontinuities inside boreholes can improve the definition of a rock mass structure The apparatus described applies a deformable membrane to the inner surface of the borehole using a compressed air inflatable packer A magnetic system then gives the orientation inside the hole and the direction of the discontinuity impression The lmpnnts are interpreted in the laboratory If the top and bottom of the discontinuity can be found, then so can its dip vector
The purpose of this paper is to show that for amsotroplc rock masses, the minimum number of overcormg boreholes required to calculate the complete state of stress wlth a gauge can be reduced from three to two This is found to apply if some conditions are satisfied by the degree of rock amsotropy and the borehole orientation The influence of these two parameters on the accuracy in the determination of m-sltu stresses in amsotroplc rock masses is also discussed
842336 Permeability acoustic logging (In French) Lebreton, F, Morher, P lnt Assoc Engng Geoi Bull N26-27, Dec 1982-June 1983, P101-105 (Paper to the lnternatwnal Symposium on Sod and Rock Investigations by In Sttu Testing, Parts, 18-20 May 1983)
842341 Acoustic character of hydraulic fractures in granite Palllet, F L Proc 24th US Symposium on R o c k Mechanics, College Station, Texas, 20-23 June 1983 P327-334 Publ AEG, 1983
Presents a permeability log based on the acoustic waveform recorded in a borehole Studies show that the beginning of the acoustic signal is strongly affected by the rock permeability Some examples are given where the permeability derived from this log is compared to the permeablhty given by the flow rates measured m SltU
842337 Drilling logs for earth dam leakage location (In French) Schneider, B lnt Assoc Engng Geol Bull 3/26-27, Dec 1982-June 1983, P123-128 (Paper to the International Symposium on Sod and Rock lm esttgattons by In Sttu Testing, Parts, 18-20 May 1983) Information obtained by keeping a continuous record of the rate of penetration, water pressure, drill bit velocity and energy during drilling through the Paloma dam and foundation in Chile was used m the determination of the causes of the leakage observed downstream of the dam and in the design of repairs The records provided clear evidence of the positions of interfaces between different beds and permitted an assessment of the nature and permeability of the beds
842338 Detection of repenetration and sediment disturbance in openbarrel gravity cores Weaver, P P E, Schulthelss, P J d Sediment Petrol V53, N2, June 1983, P649-654 Presents an analyses of repenetration found in open-barrel gravity cores by examining coccohth stratigraphy It ~s concluded that (1) the dynamics of the gravlty-conng operation may cause the corer to repenetrate the sediment thereby produclng false sedimentary records, (2) repenetrated sections are not easy to Identify unless they are being looked for on an electroosmottcally cut surface or btostratlgraphlc analysis, (3) gravity corers shorten the sedimentary record such that the top 0 5m suffers little shortening, the lower layers suffer increased shortening and the more plastic hthologies are preferentially shortened This means that sedimentation rates adjusted on a linear basis in all hthologies can be seriously in error.
Hydraulic fractures in homogeneous granitic rocks were logged with conventional acoustic-transit-time, acoustlc-waveform, and acoustic-televiewer logging systems The logs were made before and after the fractures were induced Almost all the induced fractures were identified on the three types of log except for some steeply dipping fractures The induced fractures appeared to have almost completely reclosed below a depth of 100m
842342 Planning exploratory drilling: the effect of blind zones and level of logging effort Yow, J L, Wilder, D G Proe 24th US Symposium on R o c k Mechanics, College Station, Texas, 20-23 June 1983 P807-812 Publ MEG, 1983 Exploratory drtlhng to characterize rock discontinuity spacings and attitudes should be planned with consideration of the Intended level of core logging effort and the blind zones of each hole orientation in mind Four levels of effort can be identified based on the logging of discontinuity spacings, angles of intersection with the core axis, and azimuths of the angles of intersection Each hole has an associated blind zone regardless of the level of logging effort used Drilling programmes can be improved If these effects are taken into account Careful planning may also allow complete analysis of discontinuity atutudes using economical unorlented conng techniques Auth
Geophysical techniques See a~o 842156, 842336 842343 Determination of joint directions by seismic refraction measurements at the Avedat Plateau (Israel) Ginzburg, A, Flexer, A, Pohshook, B. Dtmant, E Eagng Geal V19, N3, Oct 1983, P179-184 A seismic refraction experiment was conducted at a site where joints had been mapped in detail in order to determine whether velocity anlsotropy could be correlated with joint directions The results of the expenment show that a velocity anlsotropy can be detected by simple seismic refraction measurements, and that the anlsotropy can be correlated with the dominant joints It is believed that the techmque is applicable to the determtna-
842339 Heat-sealable pouches for preserving rock cores Splettstoesser, J F. Hoyer, M C J Sediment Petrol V53, N2, June 1983 P674-675
842335 Imprint techniques in boreholes: application to rock mass investigation (In French) Heraud, H, Lavet, M lnt Assoc Engng Geol Bull N26-27, Dec 1982-June 1983, P89-93 (Paper to the Internatzonal Sympostum on Sod and Rock Investzgattons by In Sttu Testing, Parts, 18-20 May 1983 /
84234O Number of boreholes to measure the state of stress m-situ by overcoring Amadel, B Proc 24th US Symposium on Rock Mechanics, College Statwn, Texas, 20-23 June 1983 P87-98 Publ 4EG, 1983
The imprint of discontinuities inside boreholes can improve the definition of a rock mass structure The apparatus described applies a deformable membrane to the inner surface of the borehole using a compressed air inflatable packer A magnetic system then gives the orientation inside the hole and the direction of the discontinuity impression The lmpnnts are interpreted in the laboratory If the top and bottom of the discontinuity can be found, then so can its dip vector
The purpose of this paper is to show that for amsotroplc rock masses, the minimum number of overcormg boreholes required to calculate the complete state of stress wlth a gauge can be reduced from three to two This is found to apply if some conditions are satisfied by the degree of rock amsotropy and the borehole orientation The influence of these two parameters on the accuracy in the determination of m-sltu stresses in amsotroplc rock masses is also discussed
842336 Permeability acoustic logging (In French) Lebreton, F, Morher, P lnt Assoc Engng Geoi Bull N26-27, Dec 1982-June 1983, P101-105 (Paper to the lnternatwnal Symposium on Sod and Rock Investigations by In Sttu Testing, Parts, 18-20 May 1983)
842341 Acoustic character of hydraulic fractures in granite Palllet, F L Proc 24th US Symposium on R o c k Mechanics, College Station, Texas, 20-23 June 1983 P327-334 Publ AEG, 1983
Presents a permeability log based on the acoustic waveform recorded in a borehole Studies show that the beginning of the acoustic signal is strongly affected by the rock permeability Some examples are given where the permeability derived from this log is compared to the permeablhty given by the flow rates measured m SltU
842337 Drilling logs for earth dam leakage location (In French) Schneider, B lnt Assoc Engng Geol Bull 3/26-27, Dec 1982-June 1983, P123-128 (Paper to the International Symposium on Sod and Rock lm esttgattons by In Sttu Testing, Parts, 18-20 May 1983) Information obtained by keeping a continuous record of the rate of penetration, water pressure, drill bit velocity and energy during drilling through the Paloma dam and foundation in Chile was used m the determination of the causes of the leakage observed downstream of the dam and in the design of repairs The records provided clear evidence of the positions of interfaces between different beds and permitted an assessment of the nature and permeability of the beds
842338 Detection of repenetration and sediment disturbance in openbarrel gravity cores Weaver, P P E, Schulthelss, P J d Sediment Petrol V53, N2, June 1983, P649-654 Presents an analyses of repenetration found in open-barrel gravity cores by examining coccohth stratigraphy It ~s concluded that (1) the dynamics of the gravlty-conng operation may cause the corer to repenetrate the sediment thereby produclng false sedimentary records, (2) repenetrated sections are not easy to Identify unless they are being looked for on an electroosmottcally cut surface or btostratlgraphlc analysis, (3) gravity corers shorten the sedimentary record such that the top 0 5m suffers little shortening, the lower layers suffer increased shortening and the more plastic hthologies are preferentially shortened This means that sedimentation rates adjusted on a linear basis in all hthologies can be seriously in error.
Hydraulic fractures in homogeneous granitic rocks were logged with conventional acoustic-transit-time, acoustlc-waveform, and acoustic-televiewer logging systems The logs were made before and after the fractures were induced Almost all the induced fractures were identified on the three types of log except for some steeply dipping fractures The induced fractures appeared to have almost completely reclosed below a depth of 100m
842342 Planning exploratory drilling: the effect of blind zones and level of logging effort Yow, J L, Wilder, D G Proe 24th US Symposium on R o c k Mechanics, College Station, Texas, 20-23 June 1983 P807-812 Publ MEG, 1983 Exploratory drtlhng to characterize rock discontinuity spacings and attitudes should be planned with consideration of the Intended level of core logging effort and the blind zones of each hole orientation in mind Four levels of effort can be identified based on the logging of discontinuity spacings, angles of intersection with the core axis, and azimuths of the angles of intersection Each hole has an associated blind zone regardless of the level of logging effort used Drilling programmes can be improved If these effects are taken into account Careful planning may also allow complete analysis of discontinuity atutudes using economical unorlented conng techniques Auth
Geophysical techniques See a~o 842156, 842336 842343 Determination of joint directions by seismic refraction measurements at the Avedat Plateau (Israel) Ginzburg, A, Flexer, A, Pohshook, B. Dtmant, E Eagng Geal V19, N3, Oct 1983, P179-184 A seismic refraction experiment was conducted at a site where joints had been mapped in detail in order to determine whether velocity anlsotropy could be correlated with joint directions The results of the expenment show that a velocity anlsotropy can be detected by simple seismic refraction measurements, and that the anlsotropy can be correlated with the dominant joints It is believed that the techmque is applicable to the determtna-