Field Studies: A Progress Report On The Contribution Of Logging

In recent years a new method has evolved which allows the merging of wireline surveys, core and other sample data, and geological and geophysical information to estimate reservoir properties. The method makes extensive use of 'Kriging' and multidimensional histograms. The name 'Field Study' has been retained to depict very generally the method. A field study consists, therefore, of a unified interpretation of wireline measurements, core and sample data, done on a fieldwide basis. This fundamental work is followed by an estimation of the spatial distribution of various key parameters over selected reservoirs of a field. Reservoir geometry, thickness, distribution of porosity, permeability and fluid saturation are typical parameters to permeability and fluid saturation are typical parameters to be estimated together with their integration and required combinations to obtain total pore volume, hydrocarbon in place, permeability-height, etc. All these factors are place, permeability-height, etc. All these factors are crucial to the economics of field development and productivity. productivity. At present, a large part of the input parameters for such a study consists of open-hole wireline measurements and/or data subsequently obtained from these by computer processing. processing.