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This study don’t get any certain grant of people capital firms throughout the personal, industrial, or not- for- profit sectors.
Publisher’s Mention
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 .
During the present investigation, the fresh new quantitative mineralogy out-of 76 key examples obtained from the newest Shurijeh Development can be used to evaluate the accuracy from a variety of current amendment strategies into natural gamma ray as well as spectral elements studies. The precision of your strategies try searched on such basis as lowest average percent cousin error of each petrophysical means for estimate the amount out of clay, using the investigations of journal-derived values to the true laboratory-counted frequency % out of clay nutrients. Particular effort have also been made to calibrate new logging viewpoints to your research-derived clay belongings in 76 center products by powering a low-linear regression calibration dating between your center-counted clay content material therefore the pure gamma beam index. In the end, the fresh new depositional environment and differing clay kind of the brand new Shurijeh Formation was basically acknowledged, utilising the spectral gamma beam signing ratios in addition to related get across-plots of land, correspondingly.
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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).
This new comparative glance at the Shrijeh Development lbs percent clay away from the brand new center data and different variations suggested by Larinov , Clavier , Steiber , Dewan , Bhuyan and you may Passey together with empirical calibration relationship (dashed curvilinear traces). Black network Gasoline promoting really data circumstances, and black up-pointing triangle the fresh non-generating really data factors
An average clay articles attained by the in your town calibrated gamma ray index have been nine. Such quantity had been far lower compared to viewpoints extracted from brand new former variations and you will was in fact much more accordance into lab measured research. These types of findings had a good influence on the brand new estimate out-of hydrocarbon set up and you will supplies of your own Shurijeh. Overall, the real and you can prices of lbs % clay about some other modifications, place the fresh Shurijeh Development regarding shaly sandstone classification.
References
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