What does GR log measure?
Gamma ray (GR) logs measure the natural radioactivity in formations and can be used for identifying lithologies and for correlating zones. Shale-free sandstones and carbonates have low concentrations of radioactive material and give low gamma ray readings.
What are the main three constituents of GR response?
Three elements and their decay chains are responsible for the radiation emitted by rock: potassium, thorium and uranium.
What is GR in well logging?
➢ Gamma Ray (GR) record intensity of radioactive source (clay minerals as major component) presented in mineralogical composition of rock section. ➢ Density log is used to measure bulk density.
What is GR function?
The glucocorticoid receptor (GR) is a nuclear receptor that functions as a ligand-activated transcription factor mediating the diverse physiologic effects of glucocorticoids.
What is the difference between total gamma ray and spectral gamma ray?
The Gamma Ray log is the simpler of the two and only measures the total radioactive count rate in API units. Whereas the Spectral Gamma Ray log is able to differentiate between the different radioactive elements (K, Th, U) and outputs the abundance of each in parts per million (ppm).
What is GR CCL?
Description. The QL40-GR-CCL is a combination of a natural gamma ray (GR) assembly and casing collar locator (CCL). The natural gamma ray (GR) module measures the amount of gamma radiations occurring naturally within the formations crossed by a borehole.
How does formation density log works?
The density log measures the electron density of a formation. The logging device is a contact tool that emits gamma rays from a source. Emitted gamma rays collide with formation electrons and scatter. A detector, located a fixed distance from the tool source, counts the number of returning gamma rays.
How do SP log works?
The SP curve is a continuous recording vs. depth of the electrical potential difference between a movable electrode in the borehole and a surface electrode. Adjacent to shales, SP readings usually define a straight line known as the shale baseline.
How long is the GR gene expressed?
~160 kbs
The human GR gene consists of 9 exons and is located in the long arm of the chromosome 5 (5q31. 3) in an inverse orientation and spanning ~160 kbs. Alternative splicing of the human GR gene in exon 9 generates two highly homologous receptor isoforms, termed a and b.
What are GR and MR receptors?
Mineralocorticoid receptor (MR) and glucocorticoid receptor (GR) in the hippocampus regulate HPA axis by glucocorticoid negative feedback. Abnormalities in negative feedback are found in PTSD, suggesting that GR and MR might be involved in the pathophysiology of these disorders.