Method for producing a geological vector model from seismic data for optimizing the positioning of new wells, the steps of the method being implemented by data processing means, said method being characterized in that it comprises: - a step of forming a Model-Grid which consists in creating a network of small units referred to as patches to which are assigned a relative geological age, a set of patches of the same relative geological age corresponding to a geological layer referred to as a geological horizon; - a step of sampling the Model-Grid in two directions perpendicular to each other, allowing the Model-Grid to be sampled in a plurality of vertical planes; and - a step of forming 2D geological vector models (MGV2D) which consists in forming 2D horizons (Hb) of different relative geological ages by using the patches belonging to each sampled plane, each 2D geological vector model (MGV2D) corresponding to a vertical plane from the sampling of the Model-Grid, the step of forming 2D geological vector models (MGV2D) further comprising: - a step of weighted interpolation, making it possible to create N geological horizons into which a set of faults is inserted; - a step of automatic adjustment between the N geological horizons and the set of faults, so as to adjust the contacts between each geological horizon and each fault present in the 2D geological model (MGV2D); the steps of weighted interpolation and automatic adjustment are repeated in two directions perpendicular to each other so as to obtain a plurality of 2D geological models (MGV2D) by sequencing the Model-Grid. - a step of forming a Model-Grid which consists in creating a network of small units referred to as patches to which are assigned a relative geological age, a set of patches of the same relative geological age corresponding to a geological layer referred to as a geological horizon; - a step of sampling the Model-Grid in two directions perpendicular to each other, allowing the Model-Grid to be sampled in a plurality of vertical planes; and - a step of forming 2D geological vector models (MGV2D) which consists in forming 2D horizons (Hb) of different relative geological ages by using the patches belonging to each sampled plane, each 2D geological vector model (MGV2D) corresponding to a vertical plane from the sampling of the Model-Grid, the step of forming 2D geological vector models (MGV2D) further comprising: - a step of weighted interpolation, making it possible to create N geological horizons into which a set of faults is inserted; - a step of automatic adjustment between the N geological horizons and the set of faults, so as to adjust the contacts between each geological horizon and each fault present in the 2D geological model (MGV2D); - a step of weighted interpolation, making it possible to create N geological horizons into which a set of faults is inserted; - a step of automatic adjustment between the N geological horizons and the set of faults, so as to adjust the contacts between each geological horizon and each fault present in the 2D geological model (MGV2D); the steps of weighted interpolation and automatic adjustment are repeated in two directions perpendicular to each other so as to obtain a plurality of 2D geological models (MGV2D) by sequencing the Model-Grid.