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Nejati, Saeed, Khamehchiyan, Mashalah, Nikudel, Mohammad reza, Zalooli, Ahmad. (1402). Comparing the Porosities of Upper Red Sandstone and Asmari Limestone using Petrographic Image Analysis and Saturation-Buoyancy Methods. , (), -. doi: 10.22059/geope.2023.356245.648708
Saeed Nejati; Mashalah Khamehchiyan; Mohammad reza Nikudel; Ahmad Zalooli. "Comparing the Porosities of Upper Red Sandstone and Asmari Limestone using Petrographic Image Analysis and Saturation-Buoyancy Methods". , , , 1402, -. doi: 10.22059/geope.2023.356245.648708
Nejati, Saeed, Khamehchiyan, Mashalah, Nikudel, Mohammad reza, Zalooli, Ahmad. (1402). 'Comparing the Porosities of Upper Red Sandstone and Asmari Limestone using Petrographic Image Analysis and Saturation-Buoyancy Methods', , (), pp. -. doi: 10.22059/geope.2023.356245.648708
Nejati, Saeed, Khamehchiyan, Mashalah, Nikudel, Mohammad reza, Zalooli, Ahmad. Comparing the Porosities of Upper Red Sandstone and Asmari Limestone using Petrographic Image Analysis and Saturation-Buoyancy Methods. , 1402; (): -. doi: 10.22059/geope.2023.356245.648708

Comparing the Porosities of Upper Red Sandstone and Asmari Limestone using Petrographic Image Analysis and Saturation-Buoyancy Methods

Geopersia
مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 11 شهریور 1402    اصل مقاله (4.14 M)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22059/geope.2023.356245.648708
نویسندگان
Saeed Nejati؛ Mashalah Khamehchiyan* ؛ Mohammad reza Nikudel؛ Ahmad Zalooli
Department of Geology, Faculty of Basic Science, Tarbiat Modares University, Tehran 14155-111, Iran
چکیده
This study compares rock porosities measured using petrographic image analysis (PIA) and saturation-buoyancy (SB) methods. To this end, the fresh block samples from sandstone and limestone were collected from Upper Red and Asmari Formations, respectively. Next, cylindrical core specimens from those were prepared using a coring machine. Afterward, the porosity values of sandstone and limestone samples were measured using PIA and SB methods. In the next step, the physical and mechanical properties of samples, including water absorption (W), P wave velocity (PWV), uniaxial compressive strength (UCS), Young’s modulus (E), point load strength index (PLSI), and Brazilian tensile strength (BTS), were determined. Results showed that PIA underestimates the porosity in both rocks. These conservative results can be attributed to the incomplete filling of micropores with blue-dyed epoxy resin in sandstone cement and limestone matrix or petrographic microscope limitation to differentiate micro-pores in cement and matrix. Furthermore, results demonstrated that SB in upper red sandstone has a good correlation with W, E, and BTS and a moderate correlation with PWV, UCS, and PLSI. Besides, porosity of limestone samples showed strong relation with W, PWV, and BTS, while UCS and E data versus porosity showed a scattering pattern. Finally, a strong relation was established between PIA porosity and UCS, E, and PLSI, a poor correlation was established in the cases of W, PWV, and BTS. Overall, PIA is a strong method for investigating the interior pore system of rocks, especially isolated pore spaces, although it underestimates rocks porosity compared to the SB method.
کلیدواژه‌ها
Petrographic Image Analysis؛ Porosity؛ Upper Red sandstone؛ Asmari limestone؛ Physico-Mechanical Properties
عنوان مقاله [English]
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آمار
تعداد مشاهده مقاله: 179
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