نشریه علوم زمین خوارزمی

نشریه علوم زمین خوارزمی

تحلیل چندمتغیره نقش قطر گلوگاه حفرات در تعیین ضرایب آرچی در مخازن کربناته پرمین–تریاس خلیج فارس

نویسندگان
فائزه کهنه
وحید توکلی
الهام فیجانی
دانشگاه تهران
چکیده
ضرایب آرچی از مهم‌ترین پارامترهای مورد استفاده در محاسبه اشباع آب مخازن هیدروکربنی هستند. با این حال، در بسیاری از ارزیابی‌های مخزنی، این ضرایب به‌صورت ثابت و مستقل از ویژگی‌های فیزیکی شبکه منافذ در نظر گرفته می‌شوند. این فرض در مخازن کربناته ناهمگن که هندسه منافذ و گلوگاه‌های حفرات به‌شدت متغیر است، می‌تواند موجب افزایش عدم‌قطعیت در برآورد اشباع آب شود. در این پژوهش، نقش قطر گلوگاه حفرات در کنترل تغییرات ضرایب آرچی در مخازن کربناته پرمین–تریاس خلیج فارس به‌صورت کمی و چندمتغیره بررسی شد. برای این منظور، داده‌های تخلخل و نفوذپذیری مغزه، آزمایش تزریق جیوه و فاکتور مقاومت سازند از یک چاه گازی در بخش غربی خلیج فارس مورد استفاده قرار گرفت. قطر گلوگاه حفرات در درصدهای مختلف اشباع جیوه محاسبه شد و ارتباط آن با تخلخل، نفوذپذیری، ضریب سیمان‌شدگی و فاکتور مقاومت سازند ارزیابی گردید. نتایج نشان داد که قطر گلوگاه در 10 درصد اشباع جیوه بهترین ارتباط را با تخلخل و نفوذپذیری دارد و بر همین اساس، نمونه‌ها به گونه‌های سنگی مختلف تفکیک شدند. محاسبه ضرایب آرچی در گونه‌های سنگی نشان داد که این ضرایب ثابت نبوده و در ارتباط با تغییرات هندسه شبکه منافذ تغییر می‌کنند. همچنین نتایج برازش خطی چندمتغیره نشان داد که تفکیک داده‌ها بر اساس گونه‌های سنگی باعث بهبود معنی‌دار ضرایب تعیین در روابط بین پارامترهای پتروفیزیکی و الکتریکی می‌شود. بیشترین بهبود در روابط مربوط به فاکتور مقاومت سازند و ضریب سیمان‌شدگی مشاهده شد. این نتایج نشان می‌دهد که استفاده از قطر گلوگاه حفرات و گونه‌بندی سنگی می‌تواند چارچوب دقیق‌تری برای تخمین ضرایب آرچی و کاهش عدم‌قطعیت محاسبه اشباع آب در مخازن کربناته ناهمگن فراهم کند.
کلیدواژه‌ها
ضرایب آرچی
قطر گلوگاه حفرات
گونه‌های سنگی
اشباع آب
مخازن کربناته

عنوان مقاله English

Multiple Regression Analysis of the Role of Pore Throat Diameter in Determining Archie’s Parameters in Permian–Triassic Carbonate Reservoirs of the Persian Gulf

نویسندگان English

Faeze Kahaneh
Vahid Tavakoli
Elham Fijani
University of Tehran
چکیده English

Archie’s coefficients are among the most fundamental inputs for estimating water saturation in hydrocarbon reservoirs. However, in many reservoir evaluations, these parameters are assumed to be constant and independent of the physical characteristics of the pore network. This assumption can introduce significant uncertainty in water saturation estimation in heterogeneous carbonate reservoirs where pore and throat geometries vary considerably. In this study, the role of pore‑throat diameter in controlling variations of Archie’s coefficients in the Permian–Triassic carbonate reservoirs of the Persian Gulf is quantitatively assessed using a multiple regression approach. Core-derived porosity and permeability data, mercury injection capillary pressure (MICP) analyses, and formation resistivity factor measurements from a gas well in the western Persian Gulf were utilized. Pore‑throat diameters at various mercury saturation levels were calculated and their relationships with porosity, permeability, cementation exponent, and formation resistivity factor were evaluated. Results indicate that the pore‑throat diameter at 10 percent mercury saturation shows the strongest correlation with porosity and permeability, providing a suitable basis for rock typing. Archie’s coefficients calculated within the identified rock types demonstrate that these parameters are not constant and systematically vary with changes in pore‑network geometry. Furthermore, multiple linear regression analyses reveal that rock typing significantly improves coefficients of determination in the correlations between petrophysical and electrical properties, with the strongest improvements observed for the formation resistivity factor and cementation exponent. These findings highlight that incorporating pore‑throat diameter and rock typing offers a more robust framework for estimating Archie’s coefficients and reducing uncertainty in water saturation calculations within heterogeneous carbonate reservoirs.

کلیدواژه‌ها English

Archie’s coefficients
Pore‑throat diameter
Rock Types
Water Saturation
Carbonate reservoirs
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