According to Baker et al [2015], A homogeneous reservoir has the following characteristics:
• Less than an order of magnitude variation in permeability;
• Porosity and permeability variations are random, e.g., no cycles or trends;
• No extensive shale breaks or other permeability barrier with in the layer;
• Nearly uniform productivity indices;
• Uniform pressure and production profiles;
• No flow barriers detected through pressure transient analysis or static pressures
However, most reservoirs have heterogenous permeability and porosity distributions. Continuity is often determined through open-hole log and core data, material balance, drilling observations, rate and pressure transient analysis, seismic data and more.
Note, permeability anisotropy is not the same as heterogeneity.
References:
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Baker, R., Yarranton, H. Jensen, J. (2015) Practical Reservoir Engineering and Characterization, Gulf Publishing.
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Ahmed, T., Meehan, D. N (2004) Advanced Reservoir Engineering, Gulf Professional Publishing