1پژوهشکده علوم زمین، پردیس پژوهش و توسعه صنایع بالادستی نفت، پژوهشگاه صنعت نفت، تهران، ایران
2دپارتمان مهندسی نفت، دانشگاه کرتین استرالیا
3گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، ایران
4دانشکده علوم طبیعی، گروه زمین شناسی، دانشگاه تبریز
چکیده
ماسه‌سنگ‌های مخزن گازی میدان ویچررنج در حوضه پرت به‌عنوان بخشی از مخازن نامتعارف، متشکل از ماسه‌سنگ، سیلتستون، شیل و میان لایه‌های نازک زغالی هستند که در یک سیستم رودخانه مئاندری تشکیل شده‌اند. میان لایه‌های نازک زغالی در تناوب با رسوبات دانه‌ریز سیلتی و شیلی به‌عنوان منشاء گاز درون این ماسه سنگ‌ها محسوب می‌شوند. در این مطالعه با هدف شناسایی این میان لایه‌های زغالی براساس مشخصه‌های لاگ آنها، لاگ‌های پرتو گاما، چگالی و صوتی یک چاه در میدان مورد مطالعه در تطابق با مشخصه‌های مغزه بررسی شدند. نتایج نشان می‌دهد که این واحدها به‌طورکلی با مقادیر لاگ چگالی پایین، لاگ صوتی بالا و گامای متوسط نسبت به دیگر واحدهای سنگی مخزن (ماسه‌های تمیز، ماسه‌های شیلی و شیل) مشخص می‌شوند. با توجه به نازک لایه بودن و نیز همراهی و تناوب واحدهای زغالی با رسوبات دانه‌ریز شیلی سیلتی، مقادیر لاگ گاما و لاگ صوتی آنها تا حدودی تحت تاثیر قرار گرفته و دارای همپوشانی با سایر واحدهای سنگی است. لذا در مطالعه آنها لاگ چگالی پاسخ مطمئن‌تری را فراهم می‌کند. همچنین در مطالعات مخزنی میدان بهتر است که این واحدها برای تفکیک‌پذیر بودن به‌صورت توالی‌های نازک زغال‌دار در نظر گرفته شوند. از نتایج این مطالعه می‌توان در ارزیابی دقیق‌تر ویژگی‌های پتروفیزیکی و مطالعات چینه‌نگاری سکانسی ماسه‌سنگ‌های مخزنی میدان استفاده کرد.
The Study of Coal Beds within Gas Sandstones of Whicher Range Field in the Perth Basin, Western Australia
نویسندگان [English]
Rahim Kadkhodaie Ilkhchi1؛ Reza Rezaee2؛ Sayyed Reza Moussavi Harami3؛ Ali Kadkhodaie Ilkhchi4
1Petroleum Geology Department, Research and Development in Upstream Petroleum Industry (RIPI), Tehran, Iran
2Department of Petroleum Engineering, Curtin University, Australia
3Faculty of Science, Geology Department, Ferdowsi University of Mashhad
4Earth Science Department, Faculty of Natural Science, University of Tabriz
چکیده [English]
Gas reservoir sandstones of the Whicher Range field in the Perth Basin, as a part of unconventional reservoirs, consist of sandstone, siltstone, shale and thin coal interlayers which have been developed in a meandering river system. Thin inerlayers of coal intercalated with fine grained silt and shale sediments are considered as the gas sources within the sandstones. In this study, in order to recognize these coals interlayers based on their well log characteristics, gamma ray, density and sonic logs in one well of the studied field in concordance with core properties were investigated. The results show that these units generally are characterized with low density log, high sonic and medium gamma ray values in comparison with the other reservoir units (i.e., clean sands, shaly sands, shales). Regarding the thin layering attitude and also the association and intercalation of the coal units with fine grained shaly and silty sediments, their gamma and sonic values have been to some extent affected, and have overlapping with the other reservoir rock units. Therefore, density log provides more reliable responses for their study. Also, in reservoir studies of the field for their differentiation, it is better to consider these units as thin coal bearing intervals. The results of this study can be used in the more exact evaluation of petrophysical properties, and sequence stratigraphy studies of the reservoir sandstones in the field.
کلیدواژه‌ها [English]
Gas Sandstones, Coal Interlayers, Well Logs, Whicher Range Field, Perth Basin
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