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Reservoir properties evaluation based on sequence stratigraphy: A case study from the Asmari Formation in one of the Iranian oil fields

Document Type : Original Research Paper

Authors

1 M.Sc., School of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran

2 Assistant Professor, School of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran.

3 Associate Professor, School of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran.

4 M. Sc., Iranian Offshore Oil Company, Tehran, Iran.

Abstract

The sequence stratigraphic studies provide information regarding the distribution of different facies within sedimentary basins. With determining relationship between reservoir or non-reservoir facies and sequence stratigraphy, dissemination of reservoir zones can be achieved within sequence stratigraphic framework. In this paper, using petrographic studies correlated with Gamma-Ray deviation logs, the sedimentary environment, sequences and systems tracts of the Oligo-Miocene Asmari Formation were revealed in one of the Iranian oil fields. Moreover, based on the wireline logs and petrophysical analyses, the factors controlling reservoir quality including porosity, water saturation and shale volume were invistigated within sequences and their systems tracts. The study showed that in general, the highstand systems tracts have higher reservoir quality than the trangressive systems tracts. Distribution of grain-suported and nearshore facies and also absence of anhydrite facies in the upper parts of transgressive systems tracts and the lower parts of highstand systems tracts resulted in development of the best reservoir quality zones within each sequence. This type of studies is very helpful in analysing the sedimentary basins and discovering distribution of the hydrocarbon reserves, and thus it could assist in management of risk reduction in exploration and development activities.

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References
References
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Scientific Quarterly Journal of Geosciences
Volume 31, Issue 2 - Serial Number 120
Volume 31, Issue 2, Serial Number 120, Summer 2021
September 2021
Pages 111-122
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