Well-tie analysis is a starting point for mapping facies and geology observed at well locations into seismic volumes. This step is very important for any analysis that uses seismic and well data together and can secure more accurate results by increasing consistency between seismic and well-log data. A high-quality well tie is normally considered as the art of an interpreter and is usually practiced through the stretch and squeeze of the synthetics log. Many factors can affect the quality of a well tie, and well-log quality is one of the more important ones. However, interpreters and geophysicists focus mainly on seismic and wavelet components, assuming the well logs are hard data. In practice, well logs are susceptible to different types of errors, which may not be fully addressed during petrophysical work. Rock physics acts as an efficient tool for repairing well logs to achieve a better quality well tie. Examples from various studies are presented to show the importance of further improving well logs using an appropriate rock-physics model before well-tie analysis.

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