The estimation of oil in place heavily depends on the accuracy of resistivity data and the reliability of their interpretation. Conventional interpretation of resistivity logging data is normally accomplished by using computer based correction charts that are generally applied on a level-by-level basis. This type of interpretation is approximate and does not allow for extracting all information contained in the data. This may result in overlooking oil- and gas-bearing formations. Modeling and inversion methods allow one to produce reliable estimates of formation properties. In addition, inversion provides means for incorporating data uncertainties in the process and estimate the uncertainties of formation properties. Uncertainties (error bounds) in estimated formation properties can then be used to provide minimum and maximum pay estimates.
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