4-D Analogue Modeling of Transpressional Structures Growing in a Rheologically Heterogeneous Medium: Methodology, Main Results and Reference Models
Marchal, Denis1, Jean-Marc Daniel2, Misael Alvear1 (1) Petrobras Energia Venezuela, Caracas, Venezuela (2) Institut Français du Pétrole, Rueil Malmaison, France
The study of the evolution of complex geological structures,
such as the transpressive one of La Concepción field in
During this project, twenty-two experiments have been performed to describe the tectonic evolution of a rheologically contrasted sedimentary cover lying over a stepover formed by two overlapping basement faults, reactivated by transpressional tectonics. Thirty-three 3D blocks of selected experiments have been interpreted (horizons and faults). These 3D models illustrate the main geometrical characteristics of the different fault networks generated and their evolution through time (4D approach). The analysis of these experiments has highlighted the main tectonic phenomena occurring in this tectonic setting and the principal parameters that control them.
The study shows that the La Concepción field structure best matches with a tectonic model involving transpression with a moderate amount of shortening, including a partial decoupling between the lower and the upper part of the structure. Moreover, all the models might be used as references (database) for the geologist interpreting seismic data in problematic zones (structural complexity, scarce or noisy data) and to constantly test the structural model elaborated with the field data.