Carbonate Reservoirs

Massive hydrocarbon reserves

It is estimated that more than 60% of the world's oil and 40% of the world's gas reserves are held in carbonate reservoirs. The Middle East, for example, is dominated by carbonate fields, with around 70% of oil and 90% of gas reserves held within these reservoirs.

Heterogeneous carbonate fields challenging to produce

Carbonates can exhibit highly varying properties (e.g., porosity, permeability, flow mechanisms) within small sections of the reservoir, making them difficult to characterize. A focused approach is needed to better understand the heterogeneous nature of the rock containing the fluids and the flow properties within the porous and often fractured formations. This involves detailed understanding of the fluids saturation, pore-size distribution, permeability, rock texture, reservoir rock type, and natural fracture systems at different scales.

Fracture corridors often exist that range from tens to hundreds of meters in width and height and have areal extents in the order of kilometers, representing primary pathways for hydrocarbon migration. Such fracture corridors can have a permeability of a thousand times greater or more than the surrounding rock matrix and have a considerable impact on oil, gas, and water production, including issues related to the drilling process.

Carbonate evaluation—the key to productivity

Exploration and evaluation programs for carbonates are similar to those for sandstone reservoirs. However, new tools, techniques, and interpretation methodologies are required to address the specific challenges above to drill and produce these reservoirs optimally. These involve borehole measurements in combination with high resolution 3D surface seismic surveys.

Near Wellbore Scale

Reservoir Scale

Carbonate Reservoir Production


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New Methodologies Resolve Carbonate Complexity

Resolving Carbonate Complexity
New tools, techniques and interpretation methodologies are helping petrophysicists unravel the complexities posed by carbonate reservoirs. Read industry article

Carbonate Reservoirs
World Wide

Map Highlighting Carbonate Reservoir Challenges
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