چینه‌نگاری چرخه‌ای بخش بالایی سازند دالان با استفاده از تحلیل طیفی تحولی با روش‌های تبدیل سریع فوریه و چند‌کاهنده در میدان گازی سلمان

نوع مقاله: مقاله پژوهشی

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم پایه، دانشگاه ارومیه، ایران

2 گروه زمین‌شناسی، دانشکده علوم زمین، دانشگاه تبریز، ایران

10.22078/pr.2020.3883.2770

چکیده

بخش بالایی سازند دالان در میدان سلمان از مخازن مهم گازی پرمین است. هدف از این مطالعه، بررسی چینه‌نگاری چرخه‌ای بخش بالایی سازند دالان با روش‌های تحلیل طیفی تحولی از نوع تبدیل سریع فوریه و روش چند‌کاهنده به منظور تعیین چرخه‌های میلانکوویچ و برآورد نرخ انباشت رسوب از روش‌های ضریب همبستگی تحولی و سطوح مهم تحولی با استفاده از نرم‌افزار Acycle و نگاره گامای طیفی در این میدان است. در این پژوهش طبق روش نسبت‌های طول چرخه، نزدیک 18 چرخه حرکت گریز از مرکز طولانی مدت و حدود 72 چرخه حرکت گریز از مرکز کوتاه مدت و 162 چرخه انحراف محور چرخش زمین طولانی مدت و 342 چرخه حرکت تقدیمی محور زمین طولانی مدت برای این بخش از سازند دالان شناسایی گردید. با استفاده از تحلیل طیفی تحولی مشخص شد که رسوب‌گذاری در بخش بالایی سازند دالان در چاه 2SK-1 بیشتر تحت تأثیر عملکرد کنترل نجومی چرخه‌های حرکت گریز از مرکز طولانی مدت و کوتاه مدت بوده است. به‌علاوه نرخ انباشت رسوب در این چاه برای بخش بالایی سازند دالان با استفاده از روش‌های ضریب همبستگی تحولی و سطوح مهم تحولی cm 4 در هر هزار سال یا به‌عبارت دیگر، m 40 در هر میلیون سال برآورد گردید. براساس مقیاس زمان‌نجومی چرخه‌های حرکت گریز از مرکز طولانی مدت، مدت زمان 7290 هزار سال برای پهنه‌های زیستی ارائه شده در بخش بالایی سازند دالان در این چاه محاسبه شد. با توجه به هم‌زمان بودن چرخه‌های 405 هزار ساله با ظهور و زوال زون‌های ارائه شده، تأثیر این چرخه‌ها بر پراکندگی آن‌ها مشخص گردید.
 

کلیدواژه‌ها


عنوان مقاله [English]

Cyclostratigraphy of the Upper Dalan Member by using Evolutionary Spectral Analysis with Fast Fourier Transform and Multitaper Methods in the Salman Gas Field

نویسندگان [English]

  • Omid Falahatkhah 1
  • Aliasghar Siabeghodsi 1
  • Ali Kadkhodaie 2
1 Department of Geology, Urmia University, Iran
2 Department of Geology, Faculty of Earth Sciences, University of Tabriz, Iran
چکیده [English]

The upper Dalan member in the Salman field is one of the important Permian gas reservoirs. The purpose of this study was to analyze the cyclostratigraphy of the upper Dalan member by using Evolutionary Spectral Analysis with Fast Fourier transform and multitaper methods, and thereby Milankovitch cycles would be determined and sediment accumulation rates would be estimated by Evolutionary Correlation Coefficient and Evolutionary significance levels using Acycle software and spectral gamma ray log in this field. In this study, according to the method of cycle length ratios, approximately 18 long-term eccentricity cycles and about 72 short-term eccentricity cycles and 162 long-term obliquity cycles and 342 long-term precession cycles for this section of Dalan Formation was identified. Through spectral analysis, it was revealed that sedimentation in the upper part of the Dalan Formation in the 2S-K1 well was mostly affected by astronomical control function of the long-term eccentricity cycles and short-term eccentricity cycles. In addition, the sediment accumulation rates in this well for the upper part of the Dalan Formation were estimated using Evolutionary Correlation Coefficients and Evolutionary significance levels of 4 cm per thousand years, or 40 m per million years. Based on astronomical calibration of long-term eccentricity cycles, the 7290 kyr Astronomical time scale for biozones provided by the Petroleum Industry Research Institute in the upper part of the Dalan Formation was calculated in this well. Finally, the effect of these cycles on their distribution was determined with the coincidence of 405 kyr cycles with the appearance and downfall of the presented zones.
 

کلیدواژه‌ها [English]

  • Cyclostratigraphy
  • Upper Dalan Member
  • Spectral Gamma Ray (SGR) Log
  • Acycle Software
  • Salman Gas Field
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