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Resource
This study didn’t receive any particular give off any money companies regarding the public, industrial, or otherwise not- for- money sectors.
Publisher’s Note
The clay minerals content can be obtained from various logs with certain advantages and inherent limitations, but the most commonly used technique and probably one of the most accurate methods is based on the using natural gamma ray log and the spectral components of it (i.e., K, and Th) [4, 5, 18]. The natural gamma ray log and its spectral logging data, comprising potassium (wt%), thorium (ppm), and uranium (ppm) respond to the natural radioactivity in the formation originates mainly from 40 K (0.01167% of total naturally occurring potassium), 232 Th (100% of natural thorium) and 235 U (% of the total uranium) isotopes and their daughter products in the both cased and open boreholes . The clay minerals are often the primarily radiation sources in the formations . This means that the natural gamma ray and its spectral data are often capable of distinguishing between the clay-free (low reading) and the clay-rich sandstones (high reading) on general . The response of the natural gamma ray log and its spectral components can be expressed as a linear function of the clay content (i.e., IA in Eq http://www.datingranking.net/pl/dil-mil-recenzja/. 1) with assumption of the constant radioactivity, no additional radioactive elements, good borehole conditions, and no variation in the density .
When you look at the establish investigation, new quantitative mineralogy of 76 center products taken from brand new Shurijeh Development is employed to assess the accuracy regarding several present amendment steps into the absolute gamma beam as well as spectral parts study. The precision of the strategies try seemed based on minimal mediocre % relative error of each and every petrophysical means for estimation the amount regarding clay, utilizing the research of your own journal-derived thinking on the true research-mentioned frequency % out of clay vitamins. Some effort have also been designed to calibrate the fresh signing viewpoints on lab-derived clay contents of 76 center samples of the powering a non-linear regression calibration relationships involving the core-mentioned clay information therefore the sheer gamma ray directory. Fundamentally, the new depositional environment and other clay brand of the latest Shurijeh Creation was recognized, making use of the spectral gamma beam signing rates and also the relevant mix-plots, correspondingly.
Procedures
The linear natural gamma ray and the potassium and thorium indexes (IGR, IPOTA, and ITHOR) were continuously calculated at each depth level from the corrected logging data, using the Eq. (1).
The brand new comparative glance at the Shrijeh Development pounds per cent clay out-of the fresh core study and other improvement proposed by the Larinov , Clavier , Steiber , Dewan , Bhuyan and you may Passey as well as the empirical calibration relationship (dashed curvilinear contours). Black colored circle Energy creating well studies issues, and you may black right up-pointing triangle the fresh new low-promoting really analysis products
The common clay contents achieved by the fresh in your neighborhood calibrated gamma ray index was in fact nine. These types of wide variety have been dramatically reduced compared to viewpoints obtained from the new former improvement and was indeed much more accordance into the laboratory measured research. Such results had good impact on the fresh estimation out-of hydrocarbon in position and supplies of Shurijeh. Total, both actual and you can quotes away from pounds per cent clay regarding some other changes, placed brand new Shurijeh Creation throughout the shaly sandstone classification.
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