Rock-physics modeling of deep clastic reservoirs considering the relationship between microscopic pore structure and permeability

Abstract

Deep clastic reservoirs often exhibit low porosity and low permeability due to the influence of factors such as the sedimentary environment, the ground stress field, etc. The targeted seismic rock physics model can not only specify the microscopic main controlling factors that effect the macro-elastic response of rocks but also predict the shear wave velocity. Thereby, it guides reservoir prediction. Therefore, constructing a rock physics model that considers the pore-permeability relationship, pore structure, and consolidation compaction of reservoir rocks is especially crucial. However, there is the challenge of constructing direct rock-physics relationships between permeability parameters and elastic or physical property parameters. Consequently, the relationship between permeability and pore type is developed in this study using laboratory measurement data. Building upon this foundation, the calculated elastic modulus of the dry rock skeleton is further corrected by the consolidation compaction parameters and the optimization algorithm. Numerical analysis indicates that permeability parameters introduced in the modeling process can serve as guiding factors for different pore type proportions. Additionally, the compaction coefficient exerts a significant influence on the rock's elastic modulus. The applicability and effectiveness of the modeling are confirmed through the utilization of measured well data from the East China Sea.