The Role of Diagenesis in the Formation of Compartments: A Fully Coupled 3D Reaction-Transport-Mechanical (RTM) Modeling Approach
Changxing Qin, Faical Tounsi, Khaireddine Sakrani, Walid
Sibo, Judy Lunardini, Miles J. Maxwell, and Peter J. Ortoleva
Compartments and related abnormal pressures in sedimentary basins widely exist and are of great significance for hydrocarbon exploration and production. It is widely recognized that the interplay of many processes taking place in a basin determines the formation of a compartment. However, it is generally considered that the original sedimentary features and faults are the dominant factors, while the role of diagenesis is underestimated.
We used the fully coupled three dimensional RTM simulator, CIRF.B, to model the development of compartments and overpressuring in the Anadarko and Piceance basins and to assess the relative importance of pressure solution, mechanical compaction, fracturing, and tectonic, thermal, and sedimentation history. Simulation results show that the timing and location of the formation of a compartment are determined by the overall influence of those parameters. The contribution of a specific factor can change from basin to basin because of the differences in the tectonic and sedimentation history, etc. Seals are likely to form in finer grain beds due to rapid diagenetic reduction of permeability there. It can also form in roughly uniform strata due to the formation of diagenetic bedding. The la ter is a challenge for conventional prediction of compartment based on lithology and geological structure.
AAPG Search and Discover Article #91019©1996 AAPG Convention and Exhibition 19-22 May 1996, San Diego, California