The effect of Vshale 3D distribution on the secondary migration of hydrocarbons.

This thesis discusses some topics related to the Petroleum System Modeling, a geology field of study that deals with simulation of various petroleum system elements in order to evaluate amount and type of potential hydrocarbons accumulations. In particular, this study is based on Migri, a software which aims to simulate hydrocarbons paths and accumulations linked with secondary migration process. In spite of this kind of studies have already been performed with other software, the aim of this work has been to approach a new methodology, using data that have never been considered in Eni for secondary migration simulation: in fact, this is the first time in which the flow has been considered into a 3D model lithologically defined. As a first approach, tests have been performed in order to understand how the formation shale volume (Vsh) could influence the hydrocarbon flow, and consequently the accumulations. This information started with Vsh values acquisition from gamma ray logs, carried out in correspondence of 32 wells. These values have been interpolated thanks to geostatistic methods, in order to build Vsh distribution maps for each layer interested by secondary migration processes. In particular, tests were performed on the basis of four different Vsh distribution scenarios. Obtained results represent a good starting point in the study of this software. In fact, in addition to information about the direct influence of Vsh in the model, it has been possible to understand that the results accuracy is strongly linked with the starting GeoModel quality.