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CCTV borehole surveying and its application to rock engineering
233A 934211 Procedure for assessing compositional uniformity of sand and gravel aggregates for concrete Sims, I; Miglio, B Q J Engng Geol V25, N4, 1992, P291-300
Borehole and core logging See also: 934049, 934057, 934151
934207 Geochemical logging of a Middle East carbonate reservoir Herron, S L; Petricola, M J C, Dove, R E J Pet Teclmol V44, Nil, Nov 1992, Pl176-1183 Geochemical logging has been carried out in a reservoir complex and heterogeneous in terms of its degree of dolomitization, clay mineralogy, secondary porosity and porosity distribution. The Geochemical Logging Tool (GLT) was run to provide elemental concentrations of AI, Si, Ca, Fe, S, Gd, Ti, Th, U, K, and Mg. Resistivity and nuclear logs were also run. Detailed formation mineralogy was computed and derivative properties matrix density and sigma evaluated. Permeability was inferred from empirical correlation of mineralogy logs and core data.
934208 Evaluation of Devonian shale with new core and log analysis methods Luffel, D L; Guldry, F K; Curtis, J B J Pet Teclmol V44, Nil, Nov 1992, PI192-1197 Appalachian basin Devonian shale is under investigation as a gas source. A core analysis method to determine porosity and free gas content using crushed core samples has been described in a companion paper. Results obtained from this have been used to calibrate logging data from density, neutron, natural gamma, and resistivity logs. Data from four test wells indicate reservoir porosity average about 5%, free gas content about 2% by bulk volume.
Petrographical examination of concrete aggregates is an accepted means of qualitative assessment. Usually, a single set of samples is taken from stockpiles. An improved procedure, the structured petrographic study (SPS), is proposed. In this, the sampling is carried out over a period of time and can provide information on historical consistency of an aggregate source and indicate probable future uniformity. It is illustrated for two flint-based sand and gravel sources, one dredged and one land-based.
934212 Use of down-hole focused electric logs to investigate saline groundwaters Brassington, F C; Lucey, P A; Peacock, A J Q J Engng Geol V25, N4, 1992, P343-349 During hydrogeological investigation of a Permo-Triassic sandstone aquifer in NW England, advantage was taken of 12 fully penetrating coal exploration boreholes and downhole focused electric logs (Dual Laterolog resistivity measurements) were run. Information obtained was used to examine the highly mineralised water at the base of the aquifer and the depth and thickness of its interface with fresh water. Comparisons are made between performances of focused electric logs in mud-filled boreholes and the more usual conductivity logs in open boreholes.
9342O9 Microfracturing and new tools improve formation analysis McMechan, D E; Venditto, J; Heemstra, T; Simpson, G; Friend, L L; Rothman,E Oil Gas J V90, N49, Dec 1992, P75-80
934213 Pressure response of the soil water sampler and possibilities for simultaneous soil solution sampling and teusiometry Tokunaga, T Soil Sci V154, N3, Sept 1992, P171-183
A range of instruments and techniques to add resolution to Devonian shale gas well analysis is described. Minifracturing using nitrogen provides information on stress magnitude and orientation, fracture orientation, and fracture deviation. The first tests have been made using a borehole extensometer to measure borehole deformation during fracture. Wireline open hole logging tools which can estimate stress profiles and temperature logging instruments for air-filled boreholes have been developed. Used in conjunction with traditional methods, these advances should allow much improved fracturing treatment design.
In soil studies, information is often required on hydraulic potential distribution and soil solution concentration profiles. Simultaneous determination of both is discussed. The theory of unsteady flow to the sampler is outlined. Equipment and methods for the test are described. Field data are presented which illustrate cases where sampler pressure can and cannot be used to derive hydraulic potential distribution.
934210 Borebole imaging tool detects well bore fractures Ma, T A; Bigelow, E L Oil Gas J V91, N2, Jan 1993, P33-36 The circumferential borehole imaging log (CBIL) instrument, an acoustic logging device designed to produce a map of the entire borehole wall, is described. As the tool is pulled up the wellbore, a rotating transducer operating in the pulse echo mode scans the wall. Information on borehole geometry, thin bed depth, fracturing, and porosity can be obtained with improved resolution over traditional methods in many circumstances. CBIL images are illustrated.
934214 CCTV borehole surveying and its application to rock engineering Gunning, A P Proc ISRM Symposium: Eurock'92, Chester, 14-17 September 1992 P175-178. Publ London: Thomas Telford, 1992 Direct acquisition of discontinuity data from borehole walls by close circuit television is an economic and flexible method of obtaining information for rock mass characterisation. A specialist CCTV borehole system developed by the Transport Research Laboratory in Scotland is illustrated. Field techniques, data collection, processing, and interpretation, limitations of the method, and future developments are discussed.
© 1993 Pergamon Press Ltd. Reproduction not permitted
Borehole and core logging See also: 934049, 934057, 934151
934207 Geochemical logging of a Middle East carbonate reservoir Herron, S L; Petricola, M J C, Dove, R E J Pet Teclmol V44, Nil, Nov 1992, Pl176-1183 Geochemical logging has been carried out in a reservoir complex and heterogeneous in terms of its degree of dolomitization, clay mineralogy, secondary porosity and porosity distribution. The Geochemical Logging Tool (GLT) was run to provide elemental concentrations of AI, Si, Ca, Fe, S, Gd, Ti, Th, U, K, and Mg. Resistivity and nuclear logs were also run. Detailed formation mineralogy was computed and derivative properties matrix density and sigma evaluated. Permeability was inferred from empirical correlation of mineralogy logs and core data.
934208 Evaluation of Devonian shale with new core and log analysis methods Luffel, D L; Guldry, F K; Curtis, J B J Pet Teclmol V44, Nil, Nov 1992, PI192-1197 Appalachian basin Devonian shale is under investigation as a gas source. A core analysis method to determine porosity and free gas content using crushed core samples has been described in a companion paper. Results obtained from this have been used to calibrate logging data from density, neutron, natural gamma, and resistivity logs. Data from four test wells indicate reservoir porosity average about 5%, free gas content about 2% by bulk volume.
Petrographical examination of concrete aggregates is an accepted means of qualitative assessment. Usually, a single set of samples is taken from stockpiles. An improved procedure, the structured petrographic study (SPS), is proposed. In this, the sampling is carried out over a period of time and can provide information on historical consistency of an aggregate source and indicate probable future uniformity. It is illustrated for two flint-based sand and gravel sources, one dredged and one land-based.
934212 Use of down-hole focused electric logs to investigate saline groundwaters Brassington, F C; Lucey, P A; Peacock, A J Q J Engng Geol V25, N4, 1992, P343-349 During hydrogeological investigation of a Permo-Triassic sandstone aquifer in NW England, advantage was taken of 12 fully penetrating coal exploration boreholes and downhole focused electric logs (Dual Laterolog resistivity measurements) were run. Information obtained was used to examine the highly mineralised water at the base of the aquifer and the depth and thickness of its interface with fresh water. Comparisons are made between performances of focused electric logs in mud-filled boreholes and the more usual conductivity logs in open boreholes.
9342O9 Microfracturing and new tools improve formation analysis McMechan, D E; Venditto, J; Heemstra, T; Simpson, G; Friend, L L; Rothman,E Oil Gas J V90, N49, Dec 1992, P75-80
934213 Pressure response of the soil water sampler and possibilities for simultaneous soil solution sampling and teusiometry Tokunaga, T Soil Sci V154, N3, Sept 1992, P171-183
A range of instruments and techniques to add resolution to Devonian shale gas well analysis is described. Minifracturing using nitrogen provides information on stress magnitude and orientation, fracture orientation, and fracture deviation. The first tests have been made using a borehole extensometer to measure borehole deformation during fracture. Wireline open hole logging tools which can estimate stress profiles and temperature logging instruments for air-filled boreholes have been developed. Used in conjunction with traditional methods, these advances should allow much improved fracturing treatment design.
In soil studies, information is often required on hydraulic potential distribution and soil solution concentration profiles. Simultaneous determination of both is discussed. The theory of unsteady flow to the sampler is outlined. Equipment and methods for the test are described. Field data are presented which illustrate cases where sampler pressure can and cannot be used to derive hydraulic potential distribution.
934210 Borebole imaging tool detects well bore fractures Ma, T A; Bigelow, E L Oil Gas J V91, N2, Jan 1993, P33-36 The circumferential borehole imaging log (CBIL) instrument, an acoustic logging device designed to produce a map of the entire borehole wall, is described. As the tool is pulled up the wellbore, a rotating transducer operating in the pulse echo mode scans the wall. Information on borehole geometry, thin bed depth, fracturing, and porosity can be obtained with improved resolution over traditional methods in many circumstances. CBIL images are illustrated.
934214 CCTV borehole surveying and its application to rock engineering Gunning, A P Proc ISRM Symposium: Eurock'92, Chester, 14-17 September 1992 P175-178. Publ London: Thomas Telford, 1992 Direct acquisition of discontinuity data from borehole walls by close circuit television is an economic and flexible method of obtaining information for rock mass characterisation. A specialist CCTV borehole system developed by the Transport Research Laboratory in Scotland is illustrated. Field techniques, data collection, processing, and interpretation, limitations of the method, and future developments are discussed.
© 1993 Pergamon Press Ltd. Reproduction not permitted