Geophysical and geochemical logs from a copper oxide deposit, Santa Cruz project, Casa Grande, Arizona

Geophysics ◽  
1994 ◽  
Vol 59 (12) ◽  
pp. 1827-1838 ◽  
Author(s):  
Philip H. Nelson ◽  
David Johnston
Keyword(s):  
Copper Oxide ◽  
Rock Strength ◽  
Gamma Ray ◽  
Petroleum Industry ◽  
Mechanical Tests ◽  
Close Link ◽  
Natural Gamma ◽  
Oxide Deposit ◽  
Copper Distribution

In support of an in‐situ leaching experiment, five holes drilled into a copper oxide deposit have been logged with geophysical and geochemical tools developed for use in the petroleum industry. When combined with geological description, chemical analyses, and mineralogical data from core and cuttings, the logs provide information regarding the alteration, fracturing, copper distribution, porosity, and permeable zones. Correlations among sonic velocity, rock strength from mechanical tests on core, and alteration indicators from neutron and potassium logs demonstrate a close link between the state of alteration and the mechanical state of the rock. Neutron activation, natural gamma‐ray, and density logs, in combination, correlate so well with copper assays that log‐based prediction of copper content is possible; in addition, an estimate of whole‐rock mineralogy is presented in log format. Based on comparisons of flow logs and acoustic logs obtained in the same holes, reductions in acoustic velocity appear to be the best indicators of permeability increases.

THE NATURAL GAMMA‐RAY FLUX: IN‐SITU ANALYSIS

Geophysics ◽  
1968 ◽  
Vol 33 (2) ◽  
pp. 311-328 ◽  
Author(s):  
Ronald Doig
Keyword(s):  
Gamma Ray ◽  
Background Radiation ◽  
In Situ Analysis ◽  
Rock Outcrops ◽  
Large Sample ◽  
Gamma Ray Spectrometer ◽  
Natural Gamma ◽  
Major Project ◽  
Quantitative Evaluations

A fully portable transistorized gamma‐ray spectrometer has been constructed, and used to investigate the nature of the gamma ray activity at the surface of rock outcrops. Gamma‐ray photopeaks of [Formula: see text] and members of the U and Th series have been identified, along with strong fallout activity dominated by the 0.75 Mev activity of [Formula: see text]. A method has been devised for measuring, in situ, the K, U, and Th contents of rocks. Calibration accounts for the interference between the radioelements, and for background radiation. The following estimates of accuracy and sensitivity are for five‐minute counting intervals: 5 percent plus 0.1 percent K, 10 percent plus 0.2 ppm U, 10 percent plus 0.5 ppm Th. The main advantages of the method are its speed and versatility and the very large sample analyzed. A number of surveys have been performed to demonstrate some of the applications of the instrument. The major project of this series is detailed mapping of the K, U, and Th distribution in the Preissac granite of northwestern Quebec. In addition to its use as a petrologic tool, the technique is eminently suited to prospecting for U and Th, and the quantitative evaluations of occurrence of these elements.

Estimation of In Situ Stresses by Using Hydraulic Fracturing and Welllogging Data in Shizhuangnan Coalbed Methane Field

2013 ◽  
Vol 734-737 ◽  
pp. 56-59
Author(s):  
Zhi Qiang Liu ◽  
Li Ren Xing ◽  
Ru Min Liu
Keyword(s):  
Residual Stress ◽  
Coalbed Methane ◽  
Gamma Ray ◽  
Ordos Basin ◽  
Complex Structure ◽  
Breakdown Pressure ◽  
Natural Gamma ◽  
Ray Density ◽  
Distribution Of Stress

This paper focuses on the research of the vertical and regional distributions of stress characteristics in the Shizhuangnan coalbed methane field, southeastern Ordos basin. The minimum and maximum horizontal stresses were firstly calculated by the breakdown pressure, closure pressure and tensile strength of the fracturing data of key wells. Then the calculated results are compared with the results calculated from the natural gamma-ray, density and acoustic logging data and Anderson’s Model. Based on the comparison, the residual stress in the Anderson’s Model is corrected. By adding the residual stress data in the Anderson’s Model, the modified model can be well used for evaluating the stress characteristics in the area with complex structure types. Finally, the distribution of stress characteristics in the Shizhuangnan coalbed methane field were evaluated by using the modified Anderson model.

scholarly journals In-situ gamma-ray background measurements for next generation CDEX experiment in the China Jinping Underground Laboratory

2021 ◽  
Vol 128 ◽  
pp. 102560
Author(s):  
H. Ma ◽  
Z. She ◽  
W.H. Zeng ◽  
Z. Zeng ◽  
M.K. Jing ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Underground Laboratory ◽  
Next Generation

scholarly journals Morphology and Mechanical Properties of Fossil Diatom Frustules from Genera of Ellerbeckia and Melosira

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1615
Author(s):  
Qiong Li ◽  
Jürgen Gluch ◽  
Zhongquan Liao ◽  
Juliane Posseckardt ◽  
André Clausner ◽  
...  
Keyword(s):  
Fracture Behavior ◽  
Three Dimensional ◽  
Mechanical Tests ◽  
Fracture Force ◽  
Thickness Change ◽  
X Ray ◽  
Transmission Electron ◽  
Percentage Concentration ◽  
Morphology Characterization

Fossil frustules of Ellerbeckia and Melosira were studied using laboratory-based nano X-ray tomography (nano-XCT), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS). Three-dimensional (3D) morphology characterization using nondestructive nano-XCT reveals the continuous connection of fultoportulae, tube processes and protrusions. The study confirms that Ellerbeckia is different from Melosira. Both genera reveal heavily silicified frustules with valve faces linking together and forming cylindrical chains. For this cylindrical architecture of both genera, valve face thickness, mantle wall thickness and copulae thickness change with the cylindrical diameter. Furthermore, EDS reveals that these fossil frustules contain Si and O only, with no other elements in the percentage concentration range. Nanopores with a diameter of approximately 15 nm were detected inside the biosilica of both genera using TEM. In situ micromechanical experiments with uniaxial loading were carried out within the nano-XCT on these fossil frustules to determine the maximal loading force under compression and to describe the fracture behavior. The fracture force of both genera is correlated to the dimension of the fossil frustules. The results from in situ mechanical tests show that the crack initiation starts either at very thin features or at linking structures of the frustules.

Hydrogen-induced amorphization and embrittlement resistance in Ti-based in situ composite with bcc-phase in an amorphous matrix

2007 ◽  
Vol 22 (2) ◽  
pp. 428-436 ◽  
Author(s):  
S. Jayalakshmi ◽  
J.P. Ahn ◽  
K.B. Kim ◽  
E. Fleury
Keyword(s):  
Hydrogen Embrittlement ◽  
Amorphous Alloys ◽  
Amorphous Matrix ◽  
Mechanical Tests ◽  
High Concentration ◽  
High Hydrogen ◽  
In Situ Composite ◽  
Bcc Phase ◽  
Embrittlement Resistance

We report the hydrogenation characteristics and mechanical properties of Ti50Zr25Cu25 in situ composite ribbons, composed of β-Ti crystalline phase dispersed in an amorphous matrix. Upon cathodic charging at room temperature, high hydrogen absorption up to ∼60 at.% (H/M = ∼1.2) is obtained. At such a high concentration, hydrogen-induced amorphization occurs. Mechanical tests conducted on the composite with varying hydrogen concentrations indicate that the Ti50Zr25Cu25 alloy is significantly resistant to hydrogen embrittlement when compared to conventional amorphous alloys. A possible mechanism that would contribute toward hydrogen-induced amorphization and hydrogen embrittlement is discussed.

Elemental analysis using natural gamma-ray spectroscopy

1994 ◽  
Vol 353 (1-3) ◽  
pp. 558-561 ◽  
Author(s):  
A. Aksoy ◽  
A.A. Naqvi ◽  
F.Z. Khiari ◽  
F. Abujarad ◽  
M. Al-Ohali ◽  
...  
Keyword(s):  
Elemental Analysis ◽  
Gamma Ray ◽  
Natural Gamma ◽  
Gamma Ray Spectroscopy
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