Sequence stratigraphic framework and distribution of potential reservoirs: Early Cretaceous Qishn Formation, Dhofar, Southern Oman

Field and petrographic studies of the Qishn Formation provide insights in to sequence stratigraphic and reservoir attributes of the formation. The reservoir properties are controlled by complex interaction between depositional textures and diagenetic products. The Barremian-Aptian Qishn Formation wa...

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Bibliographic Details
Published in:Arabian journal of geosciences 2024, Vol.17 (6), Article 171
Main Authors: Hersi, Osman Salad, Abbasi, Iftikhar Ahmed, Al-Harthy, Abdulrahman, El-Ghali, Mohammed A.K.
Format: Article
Language:English
Subjects:
Basement rock
Calcite
Cap rocks
Cement
Compaction
Concrete
Cretaceous
Diagenesis
Dolomite
Dolostone
Earth and Environmental Science
Earth Sciences
Fluids
Friability
Limestone
Mudstone
Original Paper
Pores
Porosity
Precambrian
Reservoirs
Rocks
Sandstone
Sedimentary rocks
Stratigraphy
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Summary:Field and petrographic studies of the Qishn Formation provide insights in to sequence stratigraphic and reservoir attributes of the formation. The reservoir properties are controlled by complex interaction between depositional textures and diagenetic products. The Barremian-Aptian Qishn Formation was deposited between Precambrian basement rocks and marl-dominated Albian Kharfort Formation. The Qishn Formation consists of lower sandstone (Shabon Member), middle unit dominated by lime mudstone (Hinna Member), and upper bioclastic limestone with dolostone interbeds (Hasheer Member). The formation defines a transgressive-regressive sequence with maximum flooding surface (MFS) at the top of the Hinna Member. The petrographic and diagenetic analyses indicate that Shabon and Hasheer members constitute good reservoirs. The Shabon Member is dominated by friable medium- to coarse-grained arkose to lithic arenite with porosity as high as 20%. Despite a burial depth of ~ 5 km, the sandstone maintains most of its intergranular pores. The diagenetic features include early calcite cement followed by burial compaction. However, since most of the pores were already filled by calcite cement, volumetric reduction due to compaction was minimal. Post-compaction dissolution of the early calcite cement resulted in restoration of the intergranular pores. The Hasheer Member consists of extensively cemented bioclastic packstone to rudstone with porosity 
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-024-11928-1