A well to well correlation has been performed at the Guafita Oil filed, Western Venezuela, based solely on the decomposition of the Isothermal Remagnetization (IRM) curves of the studied samples. We have determined and quantified the main magnetic phases present in samples, taken at shallow depth levels (upper 1200 m) of the studied wells, applying a Direct Signal Analysis (DSA) of the IRM curves. At some of these levels, magnetic susceptibility (MS) anomalies were observed and they have been previously related to hydrocarbon migration. Applying the DSA, we obtained bar plots that display the vertical relative change of the main magnetic mineral amounts along the stratigraphic levels of the wells. These plots showed a clear variability that also allowed, at this field, to carry out a lateral correlation between strata with the same magnetic composition and the same relative proportion. These results were also compared with a well located at a relatively close field at the Colombian Llanos foreland basin. At the Colombian well it was found a level, with only hematite and goethite according with the DSA results, which has been associated with a thoroughly documented global regression. This level was also observed at the Venezuelan wells, suggesting their possible association with this palaeo environmental change.