LOG INTERPRETATION OBJECTIVES
•The objective of log interpretation depends very much on the user. Quantitative analysis of well logs provides the analyst with values for a variety of primary parameters, such as:
- •porosity
- •water saturation, fluid type (oil/gas/water)
- •lithology
- •permeability
- •From these, many corollary parameters can be derived by integration (and other means) to arrive at values for:
- •hydrocarbons-in-place
- •reserves (the recoverable fraction of hydrocarbons in-place)
- •mapping reservoir parameters
- •But not all users of wireline logs have quantitative analysis as their objective. Many of them are more concerned with the geological and geophysical aspects. These users are interested in interpretation for:
- •well-to-well correlation
- •facies analysis
- •regional structural and sedimentary history
- •In quantitative log analysis, the objective is to define
- •the type of reservoir (lithology)
- •its storage capacity (porosity)
- •its hydrocarbon type and content (saturation)
- •its producibility (permeability)
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