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Money

This research didn’t get any particular give from one resource companies regarding the societal, commercial, or perhaps not- for- cash groups.

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 .

During the establish research, new decimal mineralogy from 76 key trials obtained from the brand new Shurijeh Creation is used to assess the precision from a multitude of existing amendment steps toward sheer gamma ray and its own spectral areas investigation. The accuracy of your steps is appeared on the basis of minimal average % cousin mistake of each and every petrophysical means for estimation the quantity out of clay, using the comparison of one’s diary-derived beliefs with the real lab-counted regularity percent out-of clay minerals. Particular effort are also designed to calibrate the fresh new signing beliefs on research-derived clay contents of 76 core examples by the running a low-linear regression calibration relationships within key-mentioned clay articles therefore the sheer gamma ray list. In the end, the brand new depositional environment and differing clay version of new Shurijeh Formation have been approved, with the spectral gamma ray logging rates as well as the associated mix-plots, respectively.

Procedures

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 comparative go through the Shrijeh Creation weight per cent clay of the fresh new center studies and other changes recommended of the Larinov , Clavier , Steiber , Dewan , Bhuyan and you will Passey and empirical calibration relationship (dashed curvilinear lines). Black network Gasoline promoting better data circumstances, and you can black right up-pointing triangle the fresh low-generating better analysis activities

The typical clay material accomplished by brand new in your area calibrated gamma beam list was in fact nine. This type of number was reduced compared to the opinions taken from the former modifications and you will was indeed much more conformity for the laboratory measured analysis. This type of conclusions have seen a beneficial influence on the quote out-of hydrocarbon set up and you can reserves of your Shurijeh. Complete, both genuine and quotes regarding lbs % clay regarding the more changes, put the newest Shurijeh Formation on the shaly sandstone category.

Sources

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