بررسی واحدهای جریانی و رخساره های الکتریکی در سازند میشریف (بخش بالایی سازند سروک) و برآورد ستبرای زون مخزنی در میدان های نفتی سیری (خلیج فارس)

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده زمین‌شناسی، دانشگاه تهران، تهران

2 شرکت نفت فلات قاره، تهران

چکیده

بخش بالایی سازند سروک یکی از مخازن مهم هیدروکربن در خاورمیانه و خلیج­فارس است. این بخش هم­ارز سازند میشریف (با سن سنومانین میانی) در خلیج­فارس و کشورهای همسایه می­باشد. در این پژوهش با آزمودن مجـموعه­ای از داده­هـای لاگ چاه­پیمایی و خوشه­بندی آن­ها بر پایه اصول آماری و ریاضی، رخساره­های الکتریکی مخزن (EF.1, EF.2, EF.3, EF.4) برای سازند میشریف در سه چاه از میدان­های سیری خلیج فارس شناسایی شدند. سپس با بهره­گیری از داده­های تخلخل و تراوایی مغزه و روش شاخص زون جریانی (FZI)، واحدهای جریانی (A,B,C,D) مشخص شدند. با تلفیق نتایج این دو روش، ستبرای زون مخرنی برای میدان های سیری اسفند، سیری دنا و سیری سیوند به ترتیب 5/0±62 متر، 5/0±91 متر و 5/0±39 متر شناسایی گردید. در پایان با بهره­گیری از فاکتور آب اشباع­شدگی­، ستبرای ستون هیدروکربنی در میدان سیری اسفند ­5/34 متر، میدان سیری دنا 5/8 متر و برای میدان سیری سیوند 5/39 متر محاسبه شد. بر این پایه، در فاصله میان میدان سیری اسفند تا دنا، ستبرای ستون هیدروکربن کاهش یافته و در فاصله میان میدان سیری دنا و سیوند ستبرای ستون هیدروکربن افزایش می­یابد.

کلیدواژه‌ها


عنوان مقاله [English]

Study of flow units and electrofacies in the Mishrif Formation (upper part of Sarvak Formation) and estimation of reservoir zone in Sirri Oilfields located in Persian Gulf

نویسندگان [English]

  • R. Jodeyri 1
  • H. Rahimpour Bonab 1
  • V. Tavakoli 1
  • R. Kadkhodaie-Ilkhchi 1
  • M. R. Yousefpour 2
چکیده [English]

The upper part of the Sarvak Formation is one of important hydrocarbon reservoirs in the Middle East and Persian Gulf. This part of the Sarvak Formation is equivalent to the Mishrif Formation (with mid-Cenomanian age) in Persian Gulf and neighboring countries. In this study, investigation of a set of well log data and their clustering based‌ on mathematic and statistical rules resulted in determination of reservoir electrofacies (EF1, EF2, EF3 and EF4) for the Mishrif Formation in three wells of Sirri fields in the Persian Gulf. Then, by using of core porosity and permeability data and flow zone indicator (FZI) method, flow units (A, B, C and D) were identified. With integration of the results from these two methods, reservoir zone thickness of Sirri Esfand, Dena and Civand 62 ± 0.5m, 91± 0.5m and 39 ± 0.5m was determined, respectively. Finally, by utilization of water saturation factor, hydrocarbon column thickness in Sirri Esfand, 34.5m; in Sirri Dena, 8.5m and in Sirri Civand, 39.5m was calculated. Based on these results, hydrocarbon column thickness from Sirri Esfand to Dena decreases, and it increases from Sirri Dena towards Sirri Civand.

کلیدواژه‌ها [English]

  • Mishrif Formation
  • Flow Zone Indicator
  • Electrofacies
  • reservoir quality
  • Water Saturation

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