Petroleum Engineering – Exploration
Alireza Kordzangeneh; Bahram Habibnia; Majid Akbari
Abstract
Permeability is one of the most significant petrophysical parameters of reservoir rock and its accurate, inexpensive, and rapid estimation is important. One of the methods for the estimation of permeability is the Stoneley flow zone index method. In this study, this method was used to estimate the permeability. ...
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Permeability is one of the most significant petrophysical parameters of reservoir rock and its accurate, inexpensive, and rapid estimation is important. One of the methods for the estimation of permeability is the Stoneley flow zone index method. In this study, this method was used to estimate the permeability. For this purpose, after processing the Stoneley waves in the studied well by Geolog software, the permeability index was calculated based on Stoneley wave slowness. Then, by optimizing this index with default values of the Index Matching Factor (IMF), the flow zone index was calculated and the permeability value was estimated based on that index. Some parameters required for these calculations such as porosity, type, and volume of minerals were determined based on the fullset logs analysis and with the help of cross-plots. Finally, in order to validate the obtained permeability data, these results were compared with the core data, and the IMF values were customized for the studied field. The results indicated that the main lithology of the Asmari Formation in the studied well is carbonate rock with a small amount of shale. The customized IMF value for calcite, dolomite, anhydrite, and shale was 11.93, 10.53, 0, and 0 respectively. The correlation coefficient between Stoneley-Flow Zone Index permeability and core permeability was 0.79. Therefore, according to this good correlation, this method can be used to estimate permeability, especially in wells without core data.
Bahram Alizadeh; Majid Alipour; Bahram Habibnia; Ahmad Reza Gandomi-Sani; Behzad Khani; Saber Shirvani; AmirAbbas Jahangard
Abstract
In an attempt to reconstruct the paleoenvironments of deposition for the Middle Jurassic Baghamshah formation, samples collected from six outcrop sections along the Shotori swell were subjected to detailed geochemical analyses. Bulk geochemical and biological marker data indicate a logical trend of the ...
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In an attempt to reconstruct the paleoenvironments of deposition for the Middle Jurassic Baghamshah formation, samples collected from six outcrop sections along the Shotori swell were subjected to detailed geochemical analyses. Bulk geochemical and biological marker data indicate a logical trend of the variation of organic input, salinity, and oxicity within Baghamshah paleoenvironments across the studied area. An increase in terrestrial character from southern end towards the central parts of the Shotori swell parallels with a uniform increase in the oxicity and a decrease in the salinity. The northernmost sections are characterized by less terrestrial impact, reduced oxicity, and elevated salinity compared to the central and southern sections. These variations are interpreted in the framework of past geometric configuration and a hypothetical paleogeomorphologic model is tentatively proposed for the Middle Jurassic of the area. According to these results, the depositional setting of the studied formation decreased in depth from Section-1 towards Section-4, suggesting that the proximity of the latter section to the Yazd Block may have had a strong control over the observed geochemical variations. The terrestrial organic input and the oxicity of the environment are conspicuously low for northern sections and their salinity shows a sharp increase compared to other sections. We hypothesize that a fault plan exists across the northern and southern Shotori Mountains that had played an active role in creating the current geochemical variations.
