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In situ porosity and permeability of selected carbonate sediment: Great Bahama Bank. Part 1: measurements
205A 914045 Automated evaluation of volumetric grain-size disu'ibotion from thin section images Pareschi, M T; Pompilio, M; Innocenti, F Comput Geosei VI6, N8, 1990, P1067-1084
An automated procedure to evaluate volumetric size distribution of grains from digitized images of thin sections is presented. The VS FORTRAN program, which is listed, counts and orders the grains present and computes for each the linear dimensions, area, elongation, and orientation. Some global parameters, total grain area and average dimension, elongation, and orientation, are also calculated. From single grain orientation, the apparent discrete size population is evaluated and size population density is derived.
914046 TEEPLOT - a Microsoft Quick-Basic program for the analysis of clast morphology Swenson, M J; Waag, C J Comput Geosci VI7, N2, 1991, P227-250
Sedimentary clast shapes in the pebble-boulder range are generally thought to reflect such factors as nature and source of material, texture and mineralogy, weathering history, and environment of transport and deposition. TEEPLOT is an easy to use, menu driven program to assist in clast morphology analysis. Output is in the form of triangular plots, histograms, and data statistics. A listing is provided.
914047 Rapid water content by computer-controlled microwave drying Gilbert, P A J Geotech Engng Div ASCE VII7. NI. Jan 1991. PI18-138
Water content has an important influence on compaction of earth fills. Determination by conventional oven drying takes up to 24 hours, which is clearly impractical for field use. The application of a standard microwave oven to reduce the time to minutes is described. It is based on continuously monitoring weight change of a specimen subjected to microwave radiation. The system, theory, and use are briefly outlined. Data are presented which show water contents for a wide range of soils correlate to within 0.5°/, for the two methods of oven drying.
914048 In situ porosity and permeability of selected carbonate sediment: Great Bahama Bank. Part I: measurements Bennet, R H; Li, H; Lambert, D N; Fischer, K M; Walter, D J; Hickox, C E; Hulbert, M H; Yamamoto, T; Badiey, M Marine Geotechnol N9, NI, Jan-March 1990, PI-28
In situ measurements on the shallow Andros platform of the Great Bahama Bank were made using permeability and porosity probes. Core samples were recovered from probe sites for laboratory examination. Depth of penetration was 0-2.5m subbottom in both cases. Laboratory and in situ porosities were in good agreement, but laboratory permeability values were an order of magnitude lower than in situ values. This is attributed to sampling disturbance. The very high permeability and porosity figures are predominantly due to combined effects of sediment grain size distribution and the microfabric, and do not fit into the classification scheme of Dunham (1962).
914O49 In situ porosity and permeability of selected carbonate sediment: Great Bahama Bank. Part 2: microfabric Bennett, R H; Fischer, K M; Li, H; Hulbert, M H; Yamamoto, T; Badiey, M Marine Geoteclmoi V9, NI, Jan-March 1990, P29.47
Selected oolitic sediments were examined to assess the role of microfabric in determining porosity and permeability and the particle packing relations (grain support versus matrix support). The rocks consist mainly of sand-size ooids supported by a matrix predominantly of aragonite needles. Microfabric influence is clearly reflected in the mass physical and depositional properties of the sediments. The influence of sampling disturbance on measured permeability is confirmed by comparison of in situ values with those of cores and remoulded samples. This suggests some laboratory data for similar coarse grained fragile fabric rock should be treated with caution. 914050 Double X-ray analysis of cuttings and rock flour: a powerful tool for rapid and reliable determination of borehole lithostratigraphy Emmermann, R; Lauterjung, J Sci Drilling VI, N6, 1990, P269-282
The drilling with 90% core recovery of the 4000m deep KTB project pilot hole provided an opportunity to evaluate a method for rapid quantitative analysis of drill cuttings and rock flour using a combination of X-ray diffraction and X-ray fluorescence. All major lithologies were clearly distinguished and fine structures resolved. The double X-ray technique provides a powerful tool for reconstruction of lithography for non-cored sections. Quantitative mineralogical phase analysis also allows calculation and estimation of petrophysical properties of penetrated rocks. 914051 Hierarchical fracture trace model Lee, J S; Veneziano, D; Einstein, H H Rock Mechanics Contributions and Challenges: Proc 31st US Symposium, Golden, 18-20 June 1990 P261-269. Publ Rotterdam: A A Balkema, 1990
Rock fracture patterns can practically only be described in probabilistic terms. Few models account for spatial inhomogeneities, they are only loosely tied to geological genesis, and they have rarely been validated against real data. A model which represents the sequential mechanism of joint formation and includes the dependencies and spatial inhomogeneities seen on outcrops is proposed. Fracture sets are described in a hierarchical order and intra- and interset dependencies are accounted for. Statistical procedures to estimate parameters and validate the model are presented. An application to field data is provided. 914052 Some geotechnical aspects of the marls of Corinth Canal Anagnostopoulos, A; Christoulas, S; Kalteziotis, N; Tsiambaos, G Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 VI, P491-494. Publ Rotterdam: A A Balkema, 1989
Marls are found in abundance in the narrow zone of the Corinth Canal. Samples have been taken, and laboratory and field tests used to determine mineralogy, grain size distribution, Atterberg limits, shear strength properties, residual shear strength, and residual angle of friction. Values obtained for these limey marls with high calcium carbonate content are compared to those from marls from other locations in Greece.
© 1991 Pergamon Press plc, Reproduction not permitted
An automated procedure to evaluate volumetric size distribution of grains from digitized images of thin sections is presented. The VS FORTRAN program, which is listed, counts and orders the grains present and computes for each the linear dimensions, area, elongation, and orientation. Some global parameters, total grain area and average dimension, elongation, and orientation, are also calculated. From single grain orientation, the apparent discrete size population is evaluated and size population density is derived.
914046 TEEPLOT - a Microsoft Quick-Basic program for the analysis of clast morphology Swenson, M J; Waag, C J Comput Geosci VI7, N2, 1991, P227-250
Sedimentary clast shapes in the pebble-boulder range are generally thought to reflect such factors as nature and source of material, texture and mineralogy, weathering history, and environment of transport and deposition. TEEPLOT is an easy to use, menu driven program to assist in clast morphology analysis. Output is in the form of triangular plots, histograms, and data statistics. A listing is provided.
914047 Rapid water content by computer-controlled microwave drying Gilbert, P A J Geotech Engng Div ASCE VII7. NI. Jan 1991. PI18-138
Water content has an important influence on compaction of earth fills. Determination by conventional oven drying takes up to 24 hours, which is clearly impractical for field use. The application of a standard microwave oven to reduce the time to minutes is described. It is based on continuously monitoring weight change of a specimen subjected to microwave radiation. The system, theory, and use are briefly outlined. Data are presented which show water contents for a wide range of soils correlate to within 0.5°/, for the two methods of oven drying.
914048 In situ porosity and permeability of selected carbonate sediment: Great Bahama Bank. Part I: measurements Bennet, R H; Li, H; Lambert, D N; Fischer, K M; Walter, D J; Hickox, C E; Hulbert, M H; Yamamoto, T; Badiey, M Marine Geotechnol N9, NI, Jan-March 1990, PI-28
In situ measurements on the shallow Andros platform of the Great Bahama Bank were made using permeability and porosity probes. Core samples were recovered from probe sites for laboratory examination. Depth of penetration was 0-2.5m subbottom in both cases. Laboratory and in situ porosities were in good agreement, but laboratory permeability values were an order of magnitude lower than in situ values. This is attributed to sampling disturbance. The very high permeability and porosity figures are predominantly due to combined effects of sediment grain size distribution and the microfabric, and do not fit into the classification scheme of Dunham (1962).
914O49 In situ porosity and permeability of selected carbonate sediment: Great Bahama Bank. Part 2: microfabric Bennett, R H; Fischer, K M; Li, H; Hulbert, M H; Yamamoto, T; Badiey, M Marine Geoteclmoi V9, NI, Jan-March 1990, P29.47
Selected oolitic sediments were examined to assess the role of microfabric in determining porosity and permeability and the particle packing relations (grain support versus matrix support). The rocks consist mainly of sand-size ooids supported by a matrix predominantly of aragonite needles. Microfabric influence is clearly reflected in the mass physical and depositional properties of the sediments. The influence of sampling disturbance on measured permeability is confirmed by comparison of in situ values with those of cores and remoulded samples. This suggests some laboratory data for similar coarse grained fragile fabric rock should be treated with caution. 914050 Double X-ray analysis of cuttings and rock flour: a powerful tool for rapid and reliable determination of borehole lithostratigraphy Emmermann, R; Lauterjung, J Sci Drilling VI, N6, 1990, P269-282
The drilling with 90% core recovery of the 4000m deep KTB project pilot hole provided an opportunity to evaluate a method for rapid quantitative analysis of drill cuttings and rock flour using a combination of X-ray diffraction and X-ray fluorescence. All major lithologies were clearly distinguished and fine structures resolved. The double X-ray technique provides a powerful tool for reconstruction of lithography for non-cored sections. Quantitative mineralogical phase analysis also allows calculation and estimation of petrophysical properties of penetrated rocks. 914051 Hierarchical fracture trace model Lee, J S; Veneziano, D; Einstein, H H Rock Mechanics Contributions and Challenges: Proc 31st US Symposium, Golden, 18-20 June 1990 P261-269. Publ Rotterdam: A A Balkema, 1990
Rock fracture patterns can practically only be described in probabilistic terms. Few models account for spatial inhomogeneities, they are only loosely tied to geological genesis, and they have rarely been validated against real data. A model which represents the sequential mechanism of joint formation and includes the dependencies and spatial inhomogeneities seen on outcrops is proposed. Fracture sets are described in a hierarchical order and intra- and interset dependencies are accounted for. Statistical procedures to estimate parameters and validate the model are presented. An application to field data is provided. 914052 Some geotechnical aspects of the marls of Corinth Canal Anagnostopoulos, A; Christoulas, S; Kalteziotis, N; Tsiambaos, G Proc 12th International Conference on Soil Mechanics and Foundation Engineering, Rio de Janeiro, 13-18 August 1989 VI, P491-494. Publ Rotterdam: A A Balkema, 1989
Marls are found in abundance in the narrow zone of the Corinth Canal. Samples have been taken, and laboratory and field tests used to determine mineralogy, grain size distribution, Atterberg limits, shear strength properties, residual shear strength, and residual angle of friction. Values obtained for these limey marls with high calcium carbonate content are compared to those from marls from other locations in Greece.
© 1991 Pergamon Press plc, Reproduction not permitted