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Resource

This research didn’t get any specific offer out of any resource enterprises on personal, commercial, or perhaps not- for- earnings circles.

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., 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 fresh decimal mineralogy of 76 core products taken from the new Shurijeh Formation is utilized to evaluate the precision from numerous present modification steps into the absolute gamma beam as well as spectral components analysis. The precision of your actions are seemed based on lowest mediocre per cent cousin error each and every petrophysical method for quote the volume out-of clay, with the analysis of your own journal-derived viewpoints for the real laboratory-measured volume % out-of clay minerals. Some effort have also made to calibrate new logging thinking to the research-derived clay belongings in 76 center samples by the running a low-linear regression calibration matchmaking involving the core-mentioned clay contents while the natural gamma beam list. In the end, this new depositional environment and different clay particular the fresh Shurijeh Development were acknowledged, utilizing the spectral gamma beam logging rates and associated mix-plots, correspondingly.

Tips

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).

The brand new comparative go through the Shrijeh Creation weight percent clay off the key study and various changes advised from the Larinov , Clavier , Steiber , Dewan , Bhuyan and Passey together with empirical calibration dating (dashed curvilinear lines). Black colored system Gas producing well research factors, and you may black up-directing triangle the fresh new non-promoting really data issues

The typical clay information attained by the fresh new in your town calibrated gamma beam list was in fact nine. This type of numbers have been dramatically reduced as compared to philosophy obtained from the latest former variations and you can was in fact much more conformity into the research counted study. This type of findings have experienced an excellent effect on this new estimation away from hydrocarbon in position and you will supplies of the Shurijeh. Total, the actual and you will estimates out-of pounds per cent clay in the various other improvement, place the latest Shurijeh Formation about shaly sandstone class.

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