- Email: [email protected]
Information systems for discovery 2000
SITE INVESTIGATIONS:DATA Neutron-induced y-ray spectra from borehole rock at several depths have been analyzed for use as test samples for evaluating continuum spectra for deriving chemical compositions from y-ray spectra of thick target sources. A fast Fourier transform technique has been used to obtain the information from selected energy bands in the continuum spectra. Monte Carlo calculationsto model the borehole data have been performed using the major y-ray energy source to generate the y-ray spectra.A number of testshave shown that using the continuum can greatly increase the sensitivityand precision of the measurement of elemental concentrations determined from y-ray spectra of thick target sources, and especially for spectra having y-ray peaks of poor statistical significance. (from Authors)
958219 Empirical equation estimates geothermal gradients I. M. Kutasov, Oil & Gas Journal, 93(1), 1995, pp 48,50. This article presents an empirical equation for calculating geothermal temperature profiles in exploration wells. The calculation uses downhole circulating temperature logs and surface outlet temperatures. It can be used for both onshore and offshore wells, and deep wells. (J.M.McLaughlin)
Presentation and interpretation of data 958220 Introduction to geological data analysis
A. R. H. Swan & M. Sandilands, (Biackwell Science), ISBN (paperback) 0 632 03224 3, price £22.50, 1995, 446 pp, index. This book provides explanations of the essential concepts involved in the analysis of geological data, together with descriptions and examples of the most important techniques. There are eight chapters, as follows: data collection and preparation; statistics with one variable; statistics with two variables; non-parametric stratistics; directional data and circular statistics; data through time; geographically distributed data; and multivariate methods. (G.E.Hodgson) 958221 Some aspects of back analysis in geotecknieal engineering S. Sakural & S. Akutagawa, in: Eurock '93. Safety and environmental issues in rock engineering. Proc. symposium, Lisboa, 1993. Vol. 2, ed L. Ribeiro E Sousa & N.F. Grossmann, (Balkema), 1995, pp 1133-1140. Field measurements are well recotmiYed as a powerful tool for monitoring the stability of rock structures such as tunnels, underground caverns, slopes, etc. The measurement results must be properly interpreted without delay when assessing the adequacy of the original design and construction method. In the interpretation of the results, back analysis plays an important role. In this paper, the role of back analysis is described in association with engineering practice. It is emphasized that back analysis is not simply backward calculation, but its basic concept should be different from the one of ordinary analysis. A method of back analysis is proposed for interpretating the non-elastic behaviour of rocks. (Authors) 958222 Information systems for Discovery 2000 R. R. Lucas, in: Adding value to our resources - our future. Proc. conference, Newcastle, NSW, 1995; (AuslMM), 1995, pp 11-13. Discovery 2000 is basically about data, its collection, management, assessment and dissemination. A major focus of Discovery 2000 is the collection of new geoscientific data. Data on the geology and mineral resources of New South
387A
Wales already exists. These existing data when combined with the new data, will greatly enhance the knowledge of and information on the geology and the mineral development potential of New South Wales. This paper discusses some of the existing datasets and outlines how they can be accessed. It also gives an insight into the strategy for data and information technology management. (Author) 958223 An automated environment for soils- and terrain-de~ndent applications A. A. Oloufa & M. Ikeda, Automation in Construction, 4(2), 1995, pp 139-146. This paper explains the development of an integrated information environment that is designed specifically for applications dependent on information related to soil types and terrain of the project site. This covers a wide variety of applications such as shallow and deep foundations, trenching, earthmoving and tunnelling. The environment reported here is comprised of three main modules, a relational database for the storage and display of soil borelog information, a geographic information system that displays the geographical locations of soil studies, and a module that is used to develop a three-dimensional profile of the soil layers between any number of borelogs. The user may also develop cross sections of soil layers in any direction. The hardware and software used is discussed. (from Authors) 958224 TWYTT: a FORTRAN program for calculating the twoway travd time of stratigraphic or other markers on seismic reflection profiles of layered geological media P. De Caritat & J. Braun, Computers & Geosciences, 21(2), 1995, pp 345-348. In geological and geophysical investigations of sub-surface material, it may be necessary to ascertain positively that a given seismic reflector on a seismic profile corresponds to a particular sedimentary, structural, or other marker in the rock sequence. Given that control exists for the depth at which such a marker is present or expected to be present in the subsurface, it is easy to calculate from seismic propagation principles, where the reflector should be located, in terms of two-way travel time, on the corresponding seismic profile. This note aims at making available a simple computer program, TWYTT that perform such calculations in a layered geological sequence. (from Authors) 958225 Spreadsheet interpretation of seismic refraction data C. J. S. Fourie & A. T. R. Odgers, Computers & Geosciences, 21(2), 1995, pp 273-277. Various seismic refraction interpretation techniques are available. A simple method whereby the forward and reserve traveltime are used to determine depths to bedrock under each geophone, is known as the Plus-Minus method. An interactive spreadsheet can be used to analyze data obtained using the Plus-Minus method. For simplicity, the spreadsheet presented is designed for a two-layer (single refractor) earth, but extension to multiple refractors follows logically. The method presented has both advantages and disadvantages if compared to other available software. The advantages and disadvantages are discussed, and where possible, solutions to the problems proposed. (Authors) 958226 GMINV: a computer program for gravity or magnetic data inversion B. N. Rao, P. Ramakrishna & A. Markandeyulu, Computers & Geosciences, 21(2), 1995, pp 301-319.
958219 Empirical equation estimates geothermal gradients I. M. Kutasov, Oil & Gas Journal, 93(1), 1995, pp 48,50. This article presents an empirical equation for calculating geothermal temperature profiles in exploration wells. The calculation uses downhole circulating temperature logs and surface outlet temperatures. It can be used for both onshore and offshore wells, and deep wells. (J.M.McLaughlin)
Presentation and interpretation of data 958220 Introduction to geological data analysis
A. R. H. Swan & M. Sandilands, (Biackwell Science), ISBN (paperback) 0 632 03224 3, price £22.50, 1995, 446 pp, index. This book provides explanations of the essential concepts involved in the analysis of geological data, together with descriptions and examples of the most important techniques. There are eight chapters, as follows: data collection and preparation; statistics with one variable; statistics with two variables; non-parametric stratistics; directional data and circular statistics; data through time; geographically distributed data; and multivariate methods. (G.E.Hodgson) 958221 Some aspects of back analysis in geotecknieal engineering S. Sakural & S. Akutagawa, in: Eurock '93. Safety and environmental issues in rock engineering. Proc. symposium, Lisboa, 1993. Vol. 2, ed L. Ribeiro E Sousa & N.F. Grossmann, (Balkema), 1995, pp 1133-1140. Field measurements are well recotmiYed as a powerful tool for monitoring the stability of rock structures such as tunnels, underground caverns, slopes, etc. The measurement results must be properly interpreted without delay when assessing the adequacy of the original design and construction method. In the interpretation of the results, back analysis plays an important role. In this paper, the role of back analysis is described in association with engineering practice. It is emphasized that back analysis is not simply backward calculation, but its basic concept should be different from the one of ordinary analysis. A method of back analysis is proposed for interpretating the non-elastic behaviour of rocks. (Authors) 958222 Information systems for Discovery 2000 R. R. Lucas, in: Adding value to our resources - our future. Proc. conference, Newcastle, NSW, 1995; (AuslMM), 1995, pp 11-13. Discovery 2000 is basically about data, its collection, management, assessment and dissemination. A major focus of Discovery 2000 is the collection of new geoscientific data. Data on the geology and mineral resources of New South
387A
Wales already exists. These existing data when combined with the new data, will greatly enhance the knowledge of and information on the geology and the mineral development potential of New South Wales. This paper discusses some of the existing datasets and outlines how they can be accessed. It also gives an insight into the strategy for data and information technology management. (Author) 958223 An automated environment for soils- and terrain-de~ndent applications A. A. Oloufa & M. Ikeda, Automation in Construction, 4(2), 1995, pp 139-146. This paper explains the development of an integrated information environment that is designed specifically for applications dependent on information related to soil types and terrain of the project site. This covers a wide variety of applications such as shallow and deep foundations, trenching, earthmoving and tunnelling. The environment reported here is comprised of three main modules, a relational database for the storage and display of soil borelog information, a geographic information system that displays the geographical locations of soil studies, and a module that is used to develop a three-dimensional profile of the soil layers between any number of borelogs. The user may also develop cross sections of soil layers in any direction. The hardware and software used is discussed. (from Authors) 958224 TWYTT: a FORTRAN program for calculating the twoway travd time of stratigraphic or other markers on seismic reflection profiles of layered geological media P. De Caritat & J. Braun, Computers & Geosciences, 21(2), 1995, pp 345-348. In geological and geophysical investigations of sub-surface material, it may be necessary to ascertain positively that a given seismic reflector on a seismic profile corresponds to a particular sedimentary, structural, or other marker in the rock sequence. Given that control exists for the depth at which such a marker is present or expected to be present in the subsurface, it is easy to calculate from seismic propagation principles, where the reflector should be located, in terms of two-way travel time, on the corresponding seismic profile. This note aims at making available a simple computer program, TWYTT that perform such calculations in a layered geological sequence. (from Authors) 958225 Spreadsheet interpretation of seismic refraction data C. J. S. Fourie & A. T. R. Odgers, Computers & Geosciences, 21(2), 1995, pp 273-277. Various seismic refraction interpretation techniques are available. A simple method whereby the forward and reserve traveltime are used to determine depths to bedrock under each geophone, is known as the Plus-Minus method. An interactive spreadsheet can be used to analyze data obtained using the Plus-Minus method. For simplicity, the spreadsheet presented is designed for a two-layer (single refractor) earth, but extension to multiple refractors follows logically. The method presented has both advantages and disadvantages if compared to other available software. The advantages and disadvantages are discussed, and where possible, solutions to the problems proposed. (Authors) 958226 GMINV: a computer program for gravity or magnetic data inversion B. N. Rao, P. Ramakrishna & A. Markandeyulu, Computers & Geosciences, 21(2), 1995, pp 301-319.