What is a core log?
Core logging is the systematic recording and measuring of as much information as possible/required to determine the lithology (rock types), mineralogy, potential geological history, structure and alteration zones through a tiny piece of cylindrical rock drilled and removed from a potential mineral deposit.
How do you calculate fracture index?
The number of natural fractures is divided by the length and is reported as fractures per foot or fractures per meter. Rock Quality Designation (RQD) [2] is a fracture index used in many rock classification systems.
What is Rqd soil investigation?
Rock quality designation (RQD) is a standard technique in the mining industry for the qualitative and quantitative assessment of rock quality and degree of jointing, fracturing, and shearing in a rock mass.
What is geotechnical logging?
Geotechnical logging can be carried out by the geologist or engineer either prior to or after geological logging. The main purpose of geotechnical logging for mine design is to obtain information that may be used to establish the engineering properties of the rock mass.
What are core samples used for?
Core samples are small portions of a formation taken from an existing well and used for geologic analysis. The sample is analyzed to determine porosity, permeability, fluid content, geologic age, and probable productivity of oil from the site.
What is the fracture index?
The number of fractures in a one-metre length of drill core.
What is meant by core recovery?
i. The proportion of the drilled rock column recovered as core in core drilling. The amount withdrawn generally is expressed as a percentage of the theoretical total in general terms, as excellent, good, fair, or poor.
What is core logging and RQD?
Rock quality designation Rock-quality designation (RQD) is a rough measure of the degree of jointing or fracture in a rock mass, measured as a percentage of the drill core in lengths of 10 cm or more. RQD was originally introduced for use with core diameters of 54.7 mm (NX-size core).
What is CR and RQD?
Therefore, Core recovery (CR) = (1150/1200)x100 = 96% Rock quality designation RQD = (SUM(length of sound pieces >100mm)/Total core run length)x100. SUM(length of sound pieces >100mm) = 250+190+200 = 640mm. Therefore, RQD = (640/1200)x100 = 53% which is fair quality rocks, i.e. rocks are moderately weathered.
What is solid core recovery?
Solid core recovery (SCR) is the borehole core recovery percentage of solid, cylindrical, pieces of rock core. SCR is defined as the quotient: % = Sum of length of solid, cylindrical, core pieces = Total length of core run.
What do you need to know about core logging?
Core logging is the systematic recording and measuring of as much information as possible/required to determine the lithology (rock types), mineralogy, potential geological history, structure and alteration zones through a tiny piece of cylindrical rock drilled and removed from a potential mineral deposit.
Is there a logging provider for ASP.NET Core?
ASP.NET Core doesn’t include a logging provider for writing logs to files. To write logs to files from an ASP.NET Core app, consider using a third-party logging provider. For information on stdout and debug logging with the ASP.NET Core Module, see Troubleshoot ASP.NET Core on Azure App Service and IIS and ASP.NET Core Module. Console
Why are rock names important in core logging?
Rock name or type is most significant in core logging. Not only does it identify the rock but it also provides an immediate picture of the likely engineering behaviour of the rock.
Where are the core boxes on a logging table?
Put as many core boxes as you can on whatever logging tables you have. The top left corner will be the top-most part of the core in the hole, the bottom right will be the bottom most point. This is true of a single box or 1000 boxes if setup properly.
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