| 摘要 |
An improved model and method for analyzing oil and gas well logs is disclosed. T his method allows a log analyst to make an accurate interpretation of a well log in oil and gas bearing shaly sand formations by providing a means to correct for missing or fau lty data. The present invention provides an improved model and method for determining resi stivity when porosity is known and for determining porosity when resistivity is known. T his methodology allows the determination of water saturation in a shaly sandstone fo rmation using either resistivity, bulk volume clay or porosity data as a single input. R esistivity data can be corrected using density porosity. The combination of both resistivity and density porosity data in any well will allow corrections to questionable open hole log d ata. Correction of resistivity data for conductive clays, thin bed effects and hole a ngle is allowed.
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