The new seeking was a student in contract that have cored times of your Shurijeh depositional environment discussed of the Moussavi-Harami and you will Brenner

The new seeking was a student in contract that have cored times of your Shurijeh depositional environment discussed of the Moussavi-Harami and you will Brenner

The new seeking was a student in contract that have cored times of your Shurijeh depositional environment discussed of the Moussavi-Harami and you will Brenner

That it empirical relationships was the absolute most successful estimator for 20% pounds % clay posts; the preferred condition about sandstone reservoirs

It’s also inferred using this investigation that, the brand new Shurijeh tank Formation are transferred on marine ecosystem as Th/U ratio varied anywhere between 1.8 and you may 23.dos on gas promoting better and you may ranging from 1.2 and you will 5.six from the low-promoting better. Every study situations in wells discover Th/U ratios lower than ten showing one to, this new depositional ecosystem had a marine character. The higher Th/U ratio in the gas producing better might be on account of a lot more oxidizing conditions or even a higher intensity of other radioactive minerals including K-feldspar or big nutritional elements in the sand proportions fraction. The intermediate Th/U ratio on the 2–7 throughout the low-promoting well showed a minimal values from weathering and you may leaching regarding uranium, otherwise it may be inferred due to the fact a sign of mixes regarding materials out-of reasonable and you will high proportion surroundings.

The newest get across-plots of land review made it obvious your Shurijeh isn’t an effective brush tank as the distinctive line of party investigation facts were not close to the origin into the none of one’s mix-plots of land found in the Fig. 11; these people were most of the clustered regarding the down remaining-hands corner of each mix plot. Quicker variations within wells rather than between wells, ideal certain medical changes like more diagentic histories anywhere between wells. The knowledge factors of your own fuel promoting well was indeed faster really discriminated however, all the shown seemingly modest potassium and you may thorium into get across area designated A through Fig. 11. Both for wells, the information things toward clay typing get across-plots of land decrease in a particular town you to definitely exhibited all round items of clay nutrition in the area. But not, some data off each other wells have been shifted from the development. Regardless if, discover no arrangement with the clay sizes produced by for each and every cross-plot, however, according to research by the abilities offered from them, this new clay mineralogy throughout the creation around data might be finished while the only from glauconite/smectite/muscovite/Illite items. These types of efficiency just weren’t for the contract thereupon of your own XRD research studies accomplished to the center types of both wells. The newest kaolinite, chlorite, plus the mixed covering clay nutrition have been and stayed unrecognized because of the which petrophysical approach.

Findings

In this paper, all previously proposed modifications of natural gamma ray log and its spectral components data were reviewed and a new calibration equation for reliable assessment of the clay content in the Shurijeh reservoir Formation was presented. The quantitative XRD results showed a low average percentage of clay minerals for the gas producing well and moderate amounts for the non-producing well. The differences between the varying amounts of clay minerals in wells were attributed to the changes in the diagentic histories. In both wells, all the previously proposed modifications overestimated the weight percent clay indicating it is critical to calibrate petrophysically-derived weight percent clay to the laboratory data to find better estimations. The results also showed by using natural Steiber modified gamma ray values, more reliable clay contents could be obtained rather than all other previous modifications in this area. On the basis of minimum average percent relative error, the natural gamma ray and thorium curves were powerful tools to recognize the clay zones in a sandstone reservoir rather than potassium curve. In summary, the comparison of core clay contents from quantitative XRD data, estimated values using abdlmatch promo codes the previously proposed modifications and the empirical calibration, demonstrates that a simple nonlinear regression using the XRD data and natural gamma ray index (IGR) allows for the quantification of clay content with the least percent relative errors, i.e., lower than 12%, which is comparable to the values of the methodological errors associated with the XRD analysis. The excellent agreement between the locally calibrated natural gamma ray index and the clay quantitative XRD data showed it was well suited to provide reliable quantitative clay content estimates. The application of the proposed approach in this paper, will significantly improve the weight percent clay estimations from the gamma ray log in the Gonbadli field. The depositional environment can be correctly recognized from the spectral gamma ray logging ratio, however the safest method of reservoir clay typing is still based on the laboratory analysis of core samples. Overall, the natural gamma ray log and its spectral components data proved to be dependable qualitative and quantitative tools to diagnose clay minerals in sub-surface formation studies. In this paper, the broad scope of problem-solving capability of them was illustrated in the reservoir formation evaluation.

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