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This research don’t get any particular offer out of people financial support providers in the societal, commercial, 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 .
Within the present analysis, the brand new quantitative mineralogy out-of 76 core examples extracted from this new Shurijeh Formation is utilized to assess the accuracy out-of numerous existing amendment methods to your natural gamma beam as well as spectral section data. The precision of tips are featured on the basis of minimal average percent cousin mistake each and every petrophysical opportinity for estimate the quantity out-of clay, by using the testing of one’s journal-derived thinking towards the genuine laboratory-mentioned frequency per cent away from clay nutrition. Specific attempts are also designed to calibrate the newest logging beliefs towards research-derived clay belongings in 76 center examples of the running a low-linear regression calibration matchmaking involving the core-counted clay content and sheer gamma ray index. Finally, the fresh new depositional ecosystem as well as other clay kind of the Shurijeh Creation were recognized, with the spectral gamma ray signing rates therefore the associated mix-plots, respectively.
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).
New relative look at the Shrijeh Development pounds percent clay away from the fresh key studies as well as other improvement proposed of the Larinov , Clavier , Steiber , Dewan , Bhuyan and Passey together with empirical calibration matchmaking (dashed curvilinear lines). Black colored system Gasoline promoting well research affairs, and you can black up-leading triangle brand new non-producing well investigation things
The average clay information attained by the in your neighborhood calibrated gamma ray list had been 9. Such quantity was indeed dramatically reduced than the opinions obtained from new former improvement and was indeed much more accordance on lab counted investigation. These types of conclusions had a beneficial affect the latest quote off hydrocarbon in position and reserves of Shurijeh. Full, both the genuine and you may quotes of pounds per cent clay about other modifications, place the brand new Shurijeh Formation from the shaly sandstone category.
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