Methodology of Stepwise Multi-Scale Stress Inversion for Predicting Fault Tectonics and Fracturing: Case Study for Pre-Jurassic Complex of Tomsk Region
D. Konoshonkin, I. Churochkin, N. Konoshonkina, V. Belozerov and S. Zhigulskiy
Event name: ProGREss'19
Session: Best Practices in O&G Exploration / Лучшие практики в ГРР
Publication date: 05 August 2019
Info: Extended abstract, PDF ( 778.74Kb )
Price: € 20
According to the ideas about the formation and preservation of oil and gas reserves in the pre-Jurassic complex (PJC) of the Tomsk region, the exploration of oil and gas fields in the PJC requires an understanding of fault tectonics and the development of fracturing in rocks. Tectonics can be considered at different scales: regional scale – fault length of 100-1000 km; local scale – faults comparable to the size of the fields, and denoted by 3D seismic; point scale – fractures defined by borehole microimagers. All these categories of tectonics are examples of discontinuities of rocks caused by the reaction of rocks to the loads (stresses). In accordance with the theoretical and practical ideas of geomechanics, knowledge of the stress state at different stages of geological history allows one to describe the presence and nature of fault tectonics, i.e. anticipating the orientation of fractures and cracks, as well as assess their hydrodynamic activity (permeability) in different periods of geological time. The paper proposes an approach for prediction of tectonics at local (field) scale and point (well) scale based on the available data on regional faults, local faults (in a limited area) and fractures defined in several wells.