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Capital

This research didn’t receive any specific grant of people investment businesses throughout the social, industrial, or not- for- funds 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., I_A in Eq. 1) with assumption of the constant radioactivity, no additional radioactive elements, good borehole conditions, and no variation in the density .

Within the expose data, the new decimal mineralogy of 76 key samples obtained from brand new Shurijeh Creation is used to assess the precision from a multitude of existing amendment methods to your pure gamma beam as well as spectral elements investigation. The precision of one’s actions are appeared on such basis as minimal mediocre percent cousin mistake of each petrophysical way for quote the volume from clay, with the investigations of your log-derived opinions on real laboratory-mentioned volume per cent off clay nutrition. Some efforts have also been designed to calibrate new logging beliefs into laboratory-derived clay belongings in 76 core products from the running a low-linear regression calibration relationship amongst the core-measured clay information and also the sheer gamma beam index. Finally, the fresh new depositional environment and differing clay particular new Shurijeh Creation had been acknowledged, using the spectral gamma ray signing percentages and related mix-plots of land, respectively.

Strategies

The linear natural gamma ray and the potassium and thorium indexes (I_GR, I_POTA, and I_THOR) were continuously calculated at each depth level from the corrected logging data, using the Eq. (1).

This new relative go through the Shrijeh Formation lbs percent clay out of the newest center investigation and various modifications suggested from the Larinov , Clavier , Steiber , Dewan , Bhuyan and you can Passey additionally the empirical calibration relationship (dashed curvilinear lines). Black network Gasoline creating well studies facts, and you will black colored right up-directing triangle the newest low-generating really investigation affairs

The typical clay articles accomplished by the brand new in your town calibrated gamma ray list was nine. This type of wide variety was lower compared to the opinions obtained from new previous variations and have been much more accordance toward laboratory mentioned investigation. Such findings had a influence on brand new quote off hydrocarbon in position and you can supplies of Shurijeh. Overall, both the genuine and you will quotes off pounds percent clay from the some other variations, put this new Shurijeh Formation from the shaly sandstone class.

Sources

Rudi Am, Afarin M (2016) Interpretation the origin and you will tectonic setting out of coastal sediments from the Northeastern away from Oman Sea. Int J Spend Resour six(dosdos4):2