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This research don’t get any particular grant out-of people financing organizations on public, industrial, or not- for- cash groups.
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 research, new decimal mineralogy from 76 center examples extracted from the Shurijeh Formation is employed to assess the accuracy regarding a multitude of current amendment tips on absolute gamma ray and its particular spectral components investigation. The accuracy of your own measures try seemed on such basis as minimum mediocre % relative error of each petrophysical method for estimate the amount away from clay, with the assessment of one’s log-derived beliefs for the true research-measured volume % off clay vitamins. Certain attempts have also made to calibrate the latest signing thinking towards research-derived clay items in 76 key samples by running a low-linear regression calibration relationships amongst the core-mentioned clay content and natural gamma beam directory. In the long run, the newest depositional ecosystem and different clay type of the new Shurijeh Development was in fact approved, making use of the spectral gamma beam signing rates together with relevant get across-plots, correspondingly.
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 comparative look at the Shrijeh Formation pounds % clay from new center investigation and different changes proposed because of the Larinov , Clavier , Steiber , Dewan , Bhuyan and you may Passey additionally the empirical calibration relationship (dashed curvilinear traces). Black colored system Gasoline creating well analysis activities, and black colored right up-leading triangle the newest non-creating better data facts
The typical clay content material attained by new in your town calibrated gamma ray https://datingranking.net/pl/minder-recenzja/ list was in fact nine. This type of amounts were lower compared to values obtained from brand new former variations and you may was basically in more accordance to your laboratory measured study. Such results have seen good influence on the new quote away from hydrocarbon set up and you will supplies of the Shurijeh. Full, both actual and you may rates away from weight % clay regarding some other adjustment, set brand new Shurijeh Creation from the shaly sandstone group.
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