TITLE:
Sarvak Reservoir Facies Characteristics in One of the South West Field in Iran
AUTHORS:
Somayeh Pakparvar, Nader Kohansal Ghadimvand, Davood Jahani
KEYWORDS:
Lithotype, Heterogeneity, Paleolog, Depositional System
JOURNAL NAME:
Open Journal of Geology,
Vol.7 No.3,
March
22,
2017
ABSTRACT: Sarvak Formation (Late Albian-Early Turonian) as main reservoir in the field is one of the carbonate units of Bangestan Group in Zagros Basin with average thickness of 640 m. This formation conformably overlays the Kazhdumi Formation while the upper boundary is an erosional unconformity which is covered by Ilam Formation. There is a significant lateral and vertical heterogeneity in the reservoir layers that causes main challenge in reservoir characterization. In this paper, reservoir properties evaluation and construction of depositional model have been done based on lithotype study, sedimentary environment classification, petrophysical interpretations and SeisWorks. Five facies types (lithotypes) in the Sarvak Formation with particular rock properties are identified in 8 wells and 200 thin sections. The main facies association elements and relevant depositional settings have been interpreted by extracted Paleolog, facies and fossil association data which are related to depositional setting variations.