Representative Elementary Volume as Key Parameters to Improve Grid Stability on Multi-Point Statistic Based Reservoir Models

Abstract

Reservoir modelling plays a significant role in the investigation of reservoir heterogeneity related to the distribution of reservoir zones and lateral and vertical variations in geological and petrophysical properties of the reservoirs. Data and information derived from the core, well logs, and seismic could be used for facies and petrophysical modelling of these reservoirs. How to organize the data, how to apply the limited spatial offered by the data, and how to develop a comprehensive reservoir model by using only a few points of data are all different problems when using this data as the input for reservoir modelling. Using the Multi Point Statistics Method (MPS) to build the facies as similarly as possible to the geological feature is one of the best ways for modelling the facies. Therefore, the level of uncertainty could be reduced. However, the training image used to build the facies model must be accurate and precise. It is essential to gain as much geological insight as possible from the well logs, seismic, and core data before translated into the training image as a conceptual model. The data input could be optimized using modern tools and techniques, leading to excellent outcomes. This study discussed and dive into the various ways in which the MPS technique can be improved, such as in terms of grid stability, error reduction, well logs’ correlation to the training image, and minimize the uncertainty. The best and most effective techniques to portray a reservoir with good quality grid without scarifying the detail were determined by using the Representative Elementary Volume (REV) as the key parameter to determine layering and zoning. The result showed less discrepancy between the model and the well logs’ data, more stable grid, and will expect to be impacting the simulation progress by lowering the running time. Proper utilization of training images is also required for the geological feature to accurately record observations. It is shown that using REV for zoning and layering will improve the efficiency and accuracy of the 3D facies model.