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QuickPlot: a microcomputer-based program for processing of orientation data
35A 931258 Estimating organic carbon content of source rocks from wireline logs Lerche, I Sci Drilling I/3, N4, 1992, P170-179 Total Organic Carbon (TOC) content of potential source rocks in sedimentary basins is of great interest in the petroleum industry. A method for assessment of TOC using resistivity and sonic log response data is presented. Allowance is made for uncertainties in the parameters connecting log response to physical quantities and for errors in measurement, enabling 90% confidence ranges for TOC determinations. 931259 Analysis of optical characteristics of rock image data by borehole TV Mimuro, T; Michiie, T; Sasaki, T; Kurioka, H; lno, M Proe 7th ISRM International Congress on Rock Mechanics, Aachen, 16-20 September 1991 V1, P561-564. Publ Rotterdam." A A Balkema, 1991 Colour image data from borehole can provide important information for evaluation of rock masses. A new borehole television colour image processing system has been used to examine the optical characteristics of a range of rocks in dry, wet, and submerged states in the laboratory and the field. Analysis of optical reflectance of the colours red, blue, and green, the colour density, and the colour spectrum enables information on mineralogy, state of wetness, and cracks to be obtained. 931260 ln-situ dynamic property evaluation of gravelly soil Kokusho, T; Tanaka, Y; Yoshida, Y Proc Fifth International Conference on Soil Dynamics and
Earthquake Engineering, Karlsruhe, 23-26 September 1991 P177-188. Publ Southampton: Computational Mechanics Publications, 1991 Pleistocene gravelly soils have been examined for nuclear plant sites in Japan. An improved technique has been employed to recover undisturbed samples for testing. Liquid nitrogen pumped through freeze pipes leads to the formation of a column of frozen soil about 1.8m in diameter. Cores of 100 or 300ram diameter are taken from the column using a triple tube sampler with the outer tube equipped with a diamond bit and lubrication by cooled mud. Undrained cyclic shear strength from such samples is higher than from conventional or reconstituted samples, and correlates well with results of dynamic penetration tests. 931261 Force-controlled push sampling as a measure of in-situ shear strength for sample quality in offshore investigations de Lange, G; ten Hoope, J Proe 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V4, P2843-2848. Publ Rotterdam: A A Balkema, 1990 Offshore site investigations commonly use thin walled Shelby tubes, hydraulically pushed into the soil at constant penetration rate of about 20mm/sec. The oil pressure required to advance the sample tube is automatically recorded. The theory and practice of using the recorded data to infer sample quality (disturbance during penetration as a result of stones or gravel) and strength data for the clay is described. In situ (remoulded) shear strength-depth profiles can be constructed using a conventional pile capacity sidewall friction relation.
Presentation and interpretation of data See also: 931156 931262 QuickPlot: a microcomputer-based program for processing of orientation data van Everdingen, D A; van Gool, J A M; Vissers, R L M Comput Geosei V18, N2/3, March-April 1992, P183-287 QuickPIot is a general purpose, interactive orientation data analysis program, running on standard PC hardware. It can read data in several forms, and allows plotting, contouring, rotation, and statistical analysis of orientation data. Output is in the form of stereographic projections, modified Flinn or triangular fabric diagrams, and can be saved in a variety of formats and printed using proprietary software. The lengthy program, written in MicroSoft QuickBASIC, is listed. 931263 Use of fractal dimension in engineering geology Brosch, F J; Polsler, P; Riedmuller, G Int Assoc Engng Geol Bull N45, April 1992, P83-86 The concept of fractal geometry is introduced. Its application to characterising the roughness profiles of shear faces and fracture trace maps of foundation surfaces is illustrated. The fractal dimension is seen to be a useful parameter to describe and identify these rock masses which are difficult to quantify by other methods. Further improvements are needed in data collection and in representation and interpretation of results to allow wider use of this useful concept. 931264 Comparative study of three frequency-distribution models for use in ore evaluation Sichel, H S; Kleingeld, W J; Assibey-Bonsu, W J S Aft Inst Min Metall V92, N4, April 1992, P91-99 The reefs being mined in the Witwatersrand basin are geologically complex,which has led to difficulties in modelling the underlying ore-value distribution. The geology of the basin is examined and important conclusions are drawn concerning its genesis. The performance of three distributional models in evaluating these deposits is compared: the conventional three parameter lognormal model and two more-general models, compound lognormal and log-generalised inverse Gaussian distributions. The broad assumption that gold deposits follow the three parameter lognormal law is found to be not always true. The need to test for and take into account departures. from lognormality is emphasised. 931265 Some alternatives to geostatistics for mining and exploration Henley, S; Aucott, J W Trans lnst Min Metall (Sect A Min lnd) VIOl, Jan-April 1992, PA36-A40 Kriging methods, based on the theory of regionalised variables, have become widely accepted in reserve estimation, but complications arise when nonstationarity or aberrant data distributions are met. Kriging is a specialised form of movingaverage estimator. The use of alternatives to measure the central tendency - median and mode - in order to overcome the difficulties found with use of the mean is investigated. Potential applications are discussed. Multivariate methods for multivariate data sets are introduced. The possibility of using artificial intelligence to select the most appropriate statistical method for each given data set is suggested.
© 1993 Pergamon Press Ltd. Reproduction not permitted
Earthquake Engineering, Karlsruhe, 23-26 September 1991 P177-188. Publ Southampton: Computational Mechanics Publications, 1991 Pleistocene gravelly soils have been examined for nuclear plant sites in Japan. An improved technique has been employed to recover undisturbed samples for testing. Liquid nitrogen pumped through freeze pipes leads to the formation of a column of frozen soil about 1.8m in diameter. Cores of 100 or 300ram diameter are taken from the column using a triple tube sampler with the outer tube equipped with a diamond bit and lubrication by cooled mud. Undrained cyclic shear strength from such samples is higher than from conventional or reconstituted samples, and correlates well with results of dynamic penetration tests. 931261 Force-controlled push sampling as a measure of in-situ shear strength for sample quality in offshore investigations de Lange, G; ten Hoope, J Proe 6th International Congress International Association of Engineering Geology, Amsterdam, 6-10 August 1990 V4, P2843-2848. Publ Rotterdam: A A Balkema, 1990 Offshore site investigations commonly use thin walled Shelby tubes, hydraulically pushed into the soil at constant penetration rate of about 20mm/sec. The oil pressure required to advance the sample tube is automatically recorded. The theory and practice of using the recorded data to infer sample quality (disturbance during penetration as a result of stones or gravel) and strength data for the clay is described. In situ (remoulded) shear strength-depth profiles can be constructed using a conventional pile capacity sidewall friction relation.
Presentation and interpretation of data See also: 931156 931262 QuickPlot: a microcomputer-based program for processing of orientation data van Everdingen, D A; van Gool, J A M; Vissers, R L M Comput Geosei V18, N2/3, March-April 1992, P183-287 QuickPIot is a general purpose, interactive orientation data analysis program, running on standard PC hardware. It can read data in several forms, and allows plotting, contouring, rotation, and statistical analysis of orientation data. Output is in the form of stereographic projections, modified Flinn or triangular fabric diagrams, and can be saved in a variety of formats and printed using proprietary software. The lengthy program, written in MicroSoft QuickBASIC, is listed. 931263 Use of fractal dimension in engineering geology Brosch, F J; Polsler, P; Riedmuller, G Int Assoc Engng Geol Bull N45, April 1992, P83-86 The concept of fractal geometry is introduced. Its application to characterising the roughness profiles of shear faces and fracture trace maps of foundation surfaces is illustrated. The fractal dimension is seen to be a useful parameter to describe and identify these rock masses which are difficult to quantify by other methods. Further improvements are needed in data collection and in representation and interpretation of results to allow wider use of this useful concept. 931264 Comparative study of three frequency-distribution models for use in ore evaluation Sichel, H S; Kleingeld, W J; Assibey-Bonsu, W J S Aft Inst Min Metall V92, N4, April 1992, P91-99 The reefs being mined in the Witwatersrand basin are geologically complex,which has led to difficulties in modelling the underlying ore-value distribution. The geology of the basin is examined and important conclusions are drawn concerning its genesis. The performance of three distributional models in evaluating these deposits is compared: the conventional three parameter lognormal model and two more-general models, compound lognormal and log-generalised inverse Gaussian distributions. The broad assumption that gold deposits follow the three parameter lognormal law is found to be not always true. The need to test for and take into account departures. from lognormality is emphasised. 931265 Some alternatives to geostatistics for mining and exploration Henley, S; Aucott, J W Trans lnst Min Metall (Sect A Min lnd) VIOl, Jan-April 1992, PA36-A40 Kriging methods, based on the theory of regionalised variables, have become widely accepted in reserve estimation, but complications arise when nonstationarity or aberrant data distributions are met. Kriging is a specialised form of movingaverage estimator. The use of alternatives to measure the central tendency - median and mode - in order to overcome the difficulties found with use of the mean is investigated. Potential applications are discussed. Multivariate methods for multivariate data sets are introduced. The possibility of using artificial intelligence to select the most appropriate statistical method for each given data set is suggested.
© 1993 Pergamon Press Ltd. Reproduction not permitted