2 edition of A comparison among caliper-log, gamma-ray-log, and other diamond-drill-hole data found in the catalog.
A comparison among caliper-log, gamma-ray-log, and other diamond-drill-hole data
C. M. Bunker
|Statement||by C. M. Bunker and H. C. Hamontre.|
|Series||Experimental and theoretical geophysics, Geological Survey bulletin -- 1052-G|
|Contributions||Hamontre, H. C., United States. Bureau of Mines., U.S. Atomic Energy Commission.|
|The Physical Object|
|Pagination||iii, 241-255 p. :|
|Number of Pages||255|
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Publication History: This article is based on Chapter 3 of "The Log Analysis Handbook" by E. R. Crain, , published by Pennwell Books Republished as "Crain's Logging Tool Theory" in and updated annually through Updated Dec This webpage version is the copyrighted intellectual property of the author. No SuDoc Number Title Year Item Number Internet Access; 1: AE EL 2: Electoral College instructions to state officials: responsibilities of the States in the presidential el.
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A Comparison Among Caliper- Log, Gamma-Ray-Log, and Other Diamond-Drill-Hole Data By C. BUNKER and H. HAMONTRE EXPERIMENTAL AND THEORETICAL GEOPHYSICS GEOLOGICAL SURVEY BULLETIN 10S2-G This report concerns work done in coop eration with the U. Bureau of Mines on behalf of the U. Atomic EnergyAuthor: C.M.
Bunker, H.C. Hamontre. A comparison among caliper-log, gamma-ray-log, and other diamond-drill-hole data,U.S. Geological Survey, Water-Supply Paper, BG. Paperback – January 1, by H. Bunker, C. and Hamontre (Author) See all formats and editions Hide other formats and editionsAuthor: H.
Bunker, C. and Hamontre. A comparison among caliper-log, gamma-ray-log, and other diamond-drill-hole data on *FREE* shipping on qualifying offers. A comparison among caliper-log, gamma-ray-log, and other diamond-drill-hole dataManufacturer: United States Geological Survey.
Get this from a library. A comparison among caliper-log, gamma-ray-log, and other diamond-drill-hole data. [C M Bunker; H C Hamontre; United States. Bureau of Mines.; U.S. Atomic Energy Commission.] -- This report concerns work done in cooperation with the U.S. Bureau of Mines on behalf of the U.S.
Atomic Energy Commission and is published with the permission of the Commission. A Comparison Among Caliper- Log, Gamma-Ray-Log, and Other Diamond-Drill-Hole Data. Additional Physical Format: Print version: Bunker, C. (Carl Maurice), Comparison among caliper-log, gamma-ray-log, and other diamond-drill-hole data.
A Comparison among Caliper-Log, Gamma-Ray-Log, and Other Diamond-Drill-Hole Data. Colorado. The total gamma ray log is usually recorded in track 1 with the caliper log, bit size and SP log. In this case, the other tracks most often include resistivity, density, neutron or sonic logs (Fig.
Although the API scale goes from 0 to API, it is more common to see 0 to API and 0 to The caliper logs are plotted in track 1 with the drilling bit size for comparison, or as a differential caliper reading, where the reading represents the caliper value minus the drill bit diameter (Fig.
The scale is generally given in inches, which is standard for measuring bit sizes. Figure Presentation of 2 arm caliper log data. Oil and mining crews use the data generated during this process to find the best locations and depths to drill for oil and other fuels.
Depending on the scope of the operation, geologists and other crews can choose from two gamma ray logging techniques. Common logging provides only an indication of radioactivity, but does not distinguish.
A major advantage of the gamma-ray log over other logs is that it is possible to make equivalent measurements on an outcrop or cored section, using a geiger counter or scintillation detector.
This commonality allows direct comparison between subsurface logs and surface rock to link radioactivity patterns with visual properties and so clarify. A Comparison Among Caliper-Log, Gamma-Ray-Log, and Other Diamond-Drill-Hole Data.
Department of the Interior. Dielectric Constant and Electrical Resistivity of Natural-State Cores. Gamma ray log character is one of the primary methods used to correlate the stratigraphic section.
For most engineering and geophysical applications, the gamma ray log is primarily used to extract lithologic, mineralogic, or fabric estimates. The log response depends on the radiation, tool characteristics, and logging parameters.
The gamma ray log, like other types of well logging, is done simply by lowering an instrument down the hole and recording gamma radiation at each depth. In the United States, the device most commonly records measurements at 1/2-foot intervals. Gamma radiation is usually recorded in API units, a measurement originated by the petroleum industry.
Zircon (with other heavy minerals): thorium or uranium radiation. Siderite, pyrite, etc.: no increased radiation. Use the shape of the neutron-density cross-over to provide depositional energy in the same way as an SP or gamma ray log.
Thus, a “V” shape is a funnel (coarsening upward) and a “Λ” shape is a bell (fining upward). Irregular shapes of the borehole wall, known from caliper-log data or from experience of specific geological units, can be used within the Schlumberger (, Eqs.
4/9) cased-hole correction model. Consideration of these variations will improve the data quality, but a slightly higher amount of conception errors has to be considered in this case. The common uses of the caliper log are as follows: •In a logging context, the greatest application of caliper data is in environmental corrections to other logs that are sensitive to hole size such as Natural gamma ray, Density, Neutron logs.
•Contributory information for lithological assessment. A representation of the measured diameter of a borehole along its depth.
Caliper logs are usually measured mechanically, with only a few using sonic devices. The tools measure diameter at a specific chord across the well.
Wilson C. Chin Ph.D., in Quantitative Methods in Reservoir Engineering, Resistivity migration. Let us suppose that the ultimate electromagnetic wave resistivity tool were available and capable of determining the exact, continuous, or even discontinuous variation of electrical properties in the formation as a function of the radial coordinate r in a concentric problem.
CAL = caliper log reading (hole size) (in or mm) GR = gamma ray log reading (API units) GRc = gamma ray log reading corrected for borehole size and mud weight (API units) MWT = mud weight (lb/US gal or kg/m3) COMMENTS: The fixed constants in. Before you can start interpreting spectral gamma-ray logs (or, indeed, any kind of data), you need to ask about quality.
Calibrate your tool The main issues affecting the quality of the logs are tool calibration and drilling mud composition. I think there's a tendency to assume that deliver.Geophysical Log Category — Log Types and Codes. Geophysical Logs in the PDMS are logs that portray rock properties measured with wireline logging tools.
In the PDMS, Geophysical Logs are divided into groups of similar Log Types as shown in the table below. The Log Code is used internally by the IGS to organize digital log files and is not an individual data field in the Log Info Subtable.It is interesting to compare a shot hole caliper log to lithology logs since the softer and harder zones within the productive interval are often easily recognized (the softer material tends to cave more after the shot, leaving a bigger hole).
The arm movement of a well logging caliper must be translated into usable data.