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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 https://datingranking.net/pl/blackchristianpeoplemeet-recenzja/ 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 .

From inside the expose studies, the fresh new decimal mineralogy away from 76 core products taken from the new Shurijeh Formation is used to evaluate the accuracy out of numerous established modification measures towards the absolute gamma beam and its particular spectral components research. The accuracy of one’s steps try seemed on such basis as minimum mediocre percent cousin error each and every petrophysical method for estimation the volume from clay, with the comparison of record-derived values towards the correct research-measured regularity percent off clay nutrients. Some attempts have also designed to calibrate the fresh logging beliefs on the lab-derived clay contents of 76 core samples by powering a non-linear regression calibration matchmaking between your center-counted clay material additionally the natural gamma beam index. In the long run, new depositional ecosystem and other clay sort of brand new Shurijeh Creation was approved, using the spectral gamma ray logging percentages in addition to related get across-plots, respectively.


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 relative go through the Shrijeh Development lbs per cent clay regarding the new key study and different modifications recommended because of the Larinov , Clavier , Steiber , Dewan , Bhuyan and you will Passey plus the empirical calibration relationships (dashed curvilinear traces). Black colored circle Fuel creating really analysis products, and you may black colored upwards-pointing triangle the fresh new low-creating really study facts

The common clay contents accomplished by new in your neighborhood calibrated gamma ray directory was indeed nine. This type of amounts were far lower as compared to thinking obtained from new former changes and was basically much more accordance towards the lab mentioned research. These types of results have seen good influence on the new quote out-of hydrocarbon set up and you will supplies of your own Shurijeh. Overall, both the actual and you can rates regarding weight per cent clay on other changes, placed the latest Shurijeh Development regarding shaly sandstone group.


Rudi Are, Afarin Meters (2016) Interpretation the foundation and you will tectonic function away from seaside sediments in the Northeastern out of Oman Ocean. Int J Waste Resour 6(224):2