Investigating sedimentary cycles (cyclostratigraphy) and compliance with biological boundaries - Upper Eocene - Oligocene in Pabdeh formations (upper part of Pabdeh formation) and Asmari in Marun oil field.
Subject Areas : شاخه های دیگر علوم زمین در ارتباط با زمین شناسی نفت
Mohammad Goodarzi
1
*
,
Hassan Amiribakhtiar
2
,
kheyrolah Nuraeinejad
3
,
Mostafa Sedaqgatneia
4
1 - Department of Geology, Faculty of Sciences, Lorestan University, Khorramabad, Iran
2 - Associate professor, National Iranian South Oil Company (NISOC), Ahwaz, Iran.
3 - Ph.D. Student, Sedimentology and Sedimentary Petrology, Department of Geology, Faculty of Science, Shahid Beheshti University
4 - Ph.D. Student, Sedimentology and Sedimentary Petrology, Bu-Ali Sina University, Hamadan, Iran.
Keywords: Cyclolog, cyclostratigraphy, NB – PB Boundary surfaces, Pabdeh formations, Asmari formation, Marun oilfield and Cyclolog.,
Abstract :
In this research, the upper part of Pabdeh Formation and the lower part of Asmari Formation were studied in two wells of Marun oil field. Based on the previous biostratigraphic studies, the age of the upper part of Pabdeh Formation is Late Eocene and the lower part of Asmari Formation is Oligocene. Based on the cyclostratigraphy study, using cyclolog software, five negative boundary levels (NB) and four positive boundary levels (PB) were identified and based on these boundary levels, four sedimentary cycles were determined. Boundary levels and sedimentary cycles identified in these wells corresponded to biological boundaries or maximum sea level. Based on the study, the first sedimentary cycle (NB1000-PB1000) Corresponding to the late Eocene/Oligocene time interval., the second sedimentary cycle (NB2000-PB2000) corresponding to Ruplin-Chattian-Chattian, the third sedimentary cycle (NB3000-PB3000) and the fourth sedimentary cycle (NB4000-PB4000) were identified
Key words: Cyclolog, cyclostratigraphy, NB – PB Boundary surfaces, Pabdeh formations, Asmari formation, Marun oilfield and Cyclolog.