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Financial support
This research did not get any specific give of any money organizations regarding societal, commercial, or perhaps not- for- funds circles.
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. 1) with assumption of the constant radioactivity, no additional radioactive elements, good borehole conditions, and no variation in the density .
In establish studies, the newest decimal mineralogy from 76 center samples taken from the new Shurijeh Development is employed to evaluate the precision away from a variety of current modification methods towards the natural gamma beam and its spectral elements studies. The precision of one’s procedures are checked based on minimal average per cent relative error of every petrophysical way for estimate the volume out-of clay, utilising the review of one’s record-derived opinions on genuine lab-mentioned volume % off clay nutrition. Specific efforts have also been designed to calibrate the latest logging viewpoints on the laboratory-derived clay items in 76 center trials of the running a non-linear regression calibration dating involving the key-measured clay articles and the natural gamma ray index. In the long run, brand new depositional environment and different clay kind of brand new Shurijeh Formation were acknowledged, utilizing the spectral gamma beam logging ratios and also the related cross-plots of land, correspondingly.
Tips
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 latest relative glance at the Shrijeh Creation lbs percent clay out-of the newest key data as well as other modifications recommended by Larinov , Clavier , Steiber , Dewan , Bhuyan and you can Passey and also the empirical calibration relationships (dashed curvilinear lines). Black network Gas producing well data points, and black colored up-pointing triangle new non-promoting well research things
The typical clay contents accomplished by the new in your community calibrated gamma beam directory was 9. These types of quantity was in fact dramatically reduced than the viewpoints obtained from brand new former adjustment and were much more accordance towards research mentioned studies. This type of conclusions have obtained a great affect the newest quote regarding hydrocarbon in position and you will reserves of one’s Shurijeh. Complete, the real and quotes out-of pounds per cent clay in the some other changes, put new Shurijeh Development on the shaly sandstone group.
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