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Financial support
This study failed to receive any certain grant from any investment organizations from the societal, industrial, or otherwise not- for- earnings groups.
Publisher’s Notice
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 .
Into the expose research, the brand new decimal mineralogy away from 76 center samples extracted from the fresh new Shurijeh Formation is utilized to assess the precision from a multitude of present amendment steps into the absolute gamma beam and its own spectral section research. The accuracy of steps are checked on such basis as minimal mediocre per cent cousin mistake of every petrophysical way for estimation the quantity from clay, with the analysis of your own record-derived beliefs to your genuine lab-counted regularity % out-of clay nutrition. Some initiatives are also built to calibrate the brand new logging thinking into the laboratory-derived clay belongings in 76 key products by the powering a non-linear regression calibration relationships within center-mentioned clay content material as well as the natural gamma beam index. In the end, brand new depositional ecosystem and various clay type of this new Shurijeh Formation https://datingranking.net/pl/bristlr-recenzja/ have been approved, using the spectral gamma beam logging percentages and relevant cross-plots of land, correspondingly.
Methods
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 new comparative glance at the Shrijeh Creation pounds percent clay of the brand new key investigation and different improvement advised by the Larinov , Clavier , Steiber , Dewan , Bhuyan and you may Passey and also the empirical calibration dating (dashed curvilinear outlines). Black system Gasoline promoting well research things, and black right up-pointing triangle new low-promoting better analysis items
The average clay articles attained by new in your neighborhood calibrated gamma ray list were 9. This type of number have been far lower as compared to values obtained from the former variations and you can were much more accordance on lab counted analysis. These types of findings experienced good influence on brand new quote of hydrocarbon positioned and you can supplies of the Shurijeh. Complete, both the actual and you can quotes out of weight percent clay on the additional modifications, put brand new Shurijeh Creation regarding the shaly sandstone category.
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