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Natural fractures in the Upper Sarvak Formation in the Lurestan Zone, the Zagros Basin, Iran | ||
Geopersia | ||
مقاله 9، دوره 13، شماره 2 - شماره پیاپی 22287825، بهمن 2023، صفحه 365-384 اصل مقاله (8.1 M) | ||
نوع مقاله: Research Paper | ||
شناسه دیجیتال (DOI): 10.22059/geope.2023.356473.648707 | ||
نویسندگان | ||
Moosa Esfandyari1؛ Hassan Mohseni* 1؛ Mojtaba Heidari1؛ Asghar Seif2 | ||
1Department of Geology, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran | ||
2Department of Statistics, Faculty of Science, Bu-Ali Sina University, Hamedan, Iran | ||
چکیده | ||
Two surface sections of the Sarvak Formation in the Lurestan zone (Zagros fold-thrust belt) were examined to inspect the naturally occurring fractures. The inspected are located sections in the Surgah anticline and the Kuh-e-Charmi anticline; in the Ilam and the Kermanshah provinces respectively. The Sarvak Formation was carefully examined to record the fracture types, their spatial distribution, spacing and cross-cutting relationships. Detailed examinations were undertaken on 420 fractures, 40 core plugs porosity and P-wave velocity and 205 thin sections. Three genetic types of fractures including tectonic, pressure-solution and dissolution related fractures were identified. The tectonic related fractures include two main sets (namely with NW-SE and NE-SW trends). In addition, distinguished two types of stylolites include the bed-perpendicular and the tectonic stylolites (bed-parallel); that postdate the fractures (veins). The Sarvak Formation underwent various diagenetic processes in couple with fracturing. The pore types include microporosity, intergranular porosity, mold porosity and fracture-stylolite. Petrophysical measurements (performed on some core plugs prepared from surface block samples), show that the carbonates of the Sarvak Formation have low porosity (74% of the samples have less than 3%) and high compressional wave velocity (Vp), (96% of the samples have 6000 m/s), Therefore, it could be concluded that the Sarvak Formation is a tight interval in a reservoir aspect. | ||
کلیدواژهها | ||
Zagros Basin؛ fractured reservoir؛ carbonate rocks | ||
مراجع | ||
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