An Integrated Approach for Unconventional Fractured Reservoir Modeling in Metamorphic Basement

Abstract

The studied object is related to para-metamorphic rocks of the Paleozoic basement. Those deposits are presented by different facies of regional metamorphism after which the primary, intergranular, porosity is almost absent. During the geological history rocks were affected by different processes: several stages of tectonic activity, weathering, heating etc. All those events caused compaction, destruction and continuous tectonic displacement and resulted in complex structure of porous medium. It should be noticed that rocks have many natural fractures due to active tectonic and abundance of brittle components. There could be macro-fractures (tectonic displacements), meso-fractures (corridor of fractures) and micro-fractures. Fractures and faults could be both a flow path or an isolator. First, an integrated algorithm of petrophysical and geomechanical analysis was created. The main outputs there were rock types with reservoir and mechanical properties calibrated on core data. Those results were extended by more deep geomechanical study, integrated to complex seismic project. Realization of ES360 technology provided an anisotropy analysis and overall dependency with production history. And now, integrating together all avaliable information, the current work begins.