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Juhasz I (1981) Normalised Qv-the key to shaly mud assessment utilizing the Waxman-Smits equation in the lack of core study

Bandaru A greatR (2010) Clay-typing, depositional environment and you may shaping a great petrophysical design to own creation research for the Vashista Profession, Krishna–Godavari Basin-a situation research. In: The newest 8th Biennial around the world appointment exposition from petroleum geophysics, Hyderabad, India

Alavi M, Vaziri H, Seyed-Emami K, Lasemi Y (1997) New Triassic and associated stones of the Nakhlak and you can Aghdarband portion inside main and you may northeastern Iran as marks of southern Turanian productive continental Bull 109(12):1563–1575

Afshar Harb A (1979) Stratigraphy, tectonic and you can oils geology off Kopet-Dagh part, northeast Iran. PhD dissertation. England, School out of Science and you can Technology, College away from London area

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NIOC (Federal Iranian Oil Company, Mining Directorate) (1986) Gonbadli geological well completion report. National Iranian Oils Organization details, Tehran, Iran

Moussavi-Harami Roentgen, Brenner RL (1993) Diagenesis off non-marine oils reservoirs: the newest neocomian (straight down cretaceous) Shurijeh Creation, Kopet-Dagh basin, NE Iran. J Oils Geol sixteen(1):55–72

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This study did not receive any certain offer regarding people investment providers throughout the personal, commercial, or perhaps not- for- finances sectors.

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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 .

In establish research, brand new quantitative mineralogy of 76 key products obtained from this new Shurijeh Formation can be used to assess the precision away from a multitude of current modification steps towards absolute gamma beam and its own spectral section investigation. The precision of your procedures is actually appeared on the basis of lowest mediocre % cousin error each and every petrophysical opportinity for estimate the quantity away from clay, by using the evaluation of one’s log-derived values to your correct laboratory-measured regularity % off clay vitamins. Certain efforts are also made to calibrate new signing values towards laboratory-derived clay belongings in 76 center samples by the running a low-linear regression calibration matchmaking between your core-measured clay content material and the pure gamma beam directory. In the long run, the new depositional ecosystem and various clay type of this new Shurijeh Formation was indeed accepted, using the spectral gamma beam logging rates as well as the 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 fresh relative look at the Shrijeh Formation weight % clay of the fresh core studies and other modifications proposed by the Larinov , Clavier , Steiber , Dewan , Bhuyan and Passey together with empirical calibration relationships (dashed curvilinear outlines). Black community Gasoline generating better research things, and black colored up-leading triangle the newest low-generating well investigation affairs

The average clay content material attained by brand new in your community calibrated gamma ray index was indeed 9. These types of amounts were much lower as compared to thinking taken from the fresh former modifications and you can was basically in more accordance for the research mentioned investigation. These findings have seen a beneficial impact on the latest estimate out-of hydrocarbon set up and reserves of one’s Shurijeh. Complete, both genuine and you will estimates from weight percent clay regarding the various other changes, place the newest Shurijeh Creation in the shaly sandstone category.


Rudi In the morning, Afarin Yards (2016) Translation the origin and you will tectonic means regarding coastal sediments throughout the Northeastern off Oman Water. Int J Spend Resour six(2dos4):2

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