What is it about?

This is about a diverse reservoir with a mix of materials like dolomite, limestone, anhydrite, and shale intermingled with quartz-rich sandstones. The sandstones vary in consolidation, with the upper layers showing more anhydrite cements. The basal sandstones can be silty or shaly. Porosity in the sandstones is higher than in carbonate units. Fractures significantly impact the carbonate's permeability. Borehole imaging with oil-based mud reveals structural details and fracture characteristics. This technique also provides resistivity measurements in this environment, aiding in understanding permeability and assisting reservoir engineers and petrophysicists in evaluating formation pressure and fluid mobility.

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Why is it important?

This holds importance because it details a reservoir with diverse compositions, impacting its properties like porosity and permeability. By using oil-based mud imaging, the study reveals vital structural characteristics and fracture data. Understanding these fractures is crucial; they significantly influence fluid flow within the reservoir. Moreover, the imaging technique helps measure resistivity in this environment, aiding in grasping fluid movement and formation pressure, essential insights for reservoir engineers and petrophysicists.


This perspective highlights the diverse composition of the reservoir and emphasizes the significance of fractures, porosity, and permeability within its layers. It sheds light on how borehole imaging using oil-based mud offers critical insights into structural intricacies and fracture characteristics. Additionally, it showcases the importance of understanding invasion profiles and resistivity measurements in the context of permeability and fluid movement, providing valuable knowledge for reservoir engineers and petrophysicists in managing formation pressure and fluid mobility.

Dr Zohreh Movahed

Read the Original

This page is a summary of: Enhanced Reservoir Description in Carbonate and Clastic Reservoirs, October 2007, Society of Petroleum Engineers (SPE),
DOI: 10.2523/110277-ms.
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