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Funding
This study didn’t receive any specific grant off one resource firms throughout the social, industrial, or otherwise not- for- cash 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 randki buziak 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 the present study, the fresh new decimal mineralogy out-of 76 center examples extracted from the new Shurijeh Development is used to evaluate the precision off a multitude of established modification measures into sheer gamma beam and its own spectral areas analysis. The precision of the procedures is seemed on such basis as minimal average percent cousin error each and every petrophysical opportinity for estimation the volume of clay, utilising the assessment of your journal-derived viewpoints to the correct lab-counted regularity percent from clay nutrition. Particular attempts have also made to calibrate the signing philosophy for the laboratory-derived clay items in 76 core samples by the powering a non-linear regression calibration relationship between the center-measured clay information and also the sheer gamma beam list. In the long run, the latest depositional environment and different clay form of the new Shurijeh Creation have been recognized, making use of the spectral gamma beam signing rates and relevant mix-plots, respectively.
Strategies
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).
Brand new comparative glance at the Shrijeh Creation lbs percent clay regarding the core research and other changes recommended from the Larinov , Clavier , Steiber , Dewan , Bhuyan and Passey additionally the empirical calibration relationship (dashed curvilinear lines). Black colored circle Gas generating better studies factors, and black colored upwards-leading triangle this new low-promoting really investigation things
The typical clay information achieved by brand new in your town calibrated gamma beam index have been 9. These types of numbers was in fact far lower as compared to opinions obtained from new previous variations and you can were in more accordance towards research measured study. Such results experienced good effect on the new estimation of hydrocarbon in place and you may reserves of your own Shurijeh. Overall, both the real and you can quotes regarding pounds per cent clay regarding the other modifications, put the new Shurijeh Formation on the shaly sandstone classification.
Records
Rudi Are, Afarin Meters (2016) Translation the foundation and you can tectonic mode out-of coastal sediments on the Northeastern out of Oman Water. Int J Waste Resour 6(224):2
