Bandaru A beneficialR (2010) Clay-typing, depositional ecosystem and you can creating an excellent petrophysical model getting creation evaluation during the Vashista Job, Krishna–Godavari Basin-a case research. In: The brand new eighth Biennial global meeting exposition off oils geophysics, Hyderabad, Asia
Alavi Meters, Vaziri H, Seyed-Emami K, Lasemi Y (1997) Brand new Triassic and relevant rocks of your Nakhlak and you may Aghdarband components during the main and you will northeastern Iran as traces of one’s southern Turanian energetic continental Bull 109(12):1563–1575
Afshar Harb A great (1979) Stratigraphy, tectonic and petroleum geology off Kopet-Dagh region, northeast Iran. PhD dissertation. The united kingdomt, College or university out of Technology and you may Tech, College from London
Ulmishek Girlfriend (2004) Oils geology and you can types of this new Amu-Darya basin, Turkmenistan, Uzbekistan, Afghanistan, and you will Iran. United states Service of your own Indoor, All of us Geological Questionnaire, Iran
NIOC (Federal Iranian Oil Company, Mining Directorate) (1986) Gonbadli geological well end report. National Iranian Oils Business information, Tehran, Iran
Moussavi-Harami R, Brenner RL (1993) Diagenesis off non-aquatic oils reservoirs: the fresh new neocomian (straight down cretaceous) Shurijeh Creation, Kopet-Dagh basin, NE Iran. J Petroleum Geol 16(1):55–72
Jozanikohan G, Norouzi GH, Sahabi F, Me) Employing multilayer perceptron sensory community from inside the level of clay estimation: research study out-of Shurijeh gasoline reservoir, Northeastern Iran. J Nat Gas Sci Eng 30(22):119–131
Jozanikohan Grams, Sahabi F, Norouzi GH, Me) Quantitative research of your clay nutrients regarding Shurijeh reservoir development having fun with shared X-ray logical techniques. Russ Geol Geophys 57(7):1048–1063
Resource
This study don’t get any certain grant from one financial support businesses regarding the public, industrial, or not- for- 
money sectors.
Publisher’s Mention
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 expose studies, the brand new decimal mineralogy out-of 76 center trials obtained from brand new Shurijeh Development is employed to evaluate the precision out-of a variety of established amendment procedures for the natural gamma ray and its particular spectral parts research. The precision of one’s strategies try searched based on minimum average per cent cousin mistake of every petrophysical opportinity for quote the amount away from clay, utilizing the testing of one’s log-derived beliefs to the true laboratory-mentioned volume % out-of clay minerals. Particular efforts are also made to calibrate the brand new logging opinions towards the laboratory-derived clay contents of 76 center examples because of the powering a low-linear regression calibration dating amongst the core-counted clay material additionally the absolute gamma beam directory. Eventually, the depositional environment and various clay type of this new Shurijeh Development were accepted, utilising the spectral gamma beam signing rates plus the associated mix-plots, respectively.
Actions
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 new relative glance at the Shrijeh Creation lbs percent clay of the new center data and differing improvement proposed of the Larinov , Clavier , Steiber , Dewan , Bhuyan and you can Passey and also the empirical calibration relationship (dashed curvilinear outlines). Black colored circle Energy generating better investigation factors, and black colored up-directing triangle the low-producing better study circumstances
The average clay content material accomplished by new in your neighborhood calibrated gamma ray list was indeed 9. Such number have been much lower versus values taken from the newest previous variations and you may was indeed in more accordance to your lab measured study. This type of conclusions experienced good influence on the fresh quote from hydrocarbon positioned and you can supplies of Shurijeh. Overall, both the actual and you can prices of pounds per cent clay from the other adjustment, set the fresh new Shurijeh Creation about shaly sandstone group.
Sources
Rudi Am, Afarin Yards (2016) Interpretation the origin and you can tectonic means from seaside sediments regarding Northeastern of Oman Ocean. Int J Waste Resour six(dosdos4):2