Understanding a Reservoir: 3D Geological Modelling Using Scenario-Based Approach and Conventional Geostatistics, Onshore, UAE

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA Geological Model was built and an Uncertainty Assessment approach was used to better understand the reservoir behaviour. Conceptual models were used to constrain the number of realizations, all of which are equi-probable solutions that honour both hard and soft data.Ranking of models was done by progressively analyzing the cases/ scenarios considered. Initially, inconsistent scenarios/ cases were discarded. In other words, those that did not comply with the data distribution expected and/or the spatial distribution and consistency with the conceptual geological models are discarded. The weight of each criterion in the decision that leads to abandon a particular case or scenario varies according to the variable modeled.The final phase involved ranking the different models using body connectivity and volumetrics. The ranking was divided in sets where one variable was considered and others added progressively until all the variables were taken into account, including structure and fluid contacts uncertainty. The selected scenarios were then dynamically evaluated for well and development placement.

Real-Time Modeling-While-Drilling for Optimized Geosteering and Enhanced Horizontal Well Placement in Thin and Complex Reservoirs

“…Theoretically, logging tools' responses in a layered medium depend on the dip angle and thickness of the penetrating layers. Thus, tool proximity to a certain bed boundary within the reservoir can be detected while drilling a horizontal section, by analyzing the log curves' behavior, dip information of the bed, and the angular relationship of the tool axis to the well path (Al Muhairi et al 2006;Bertelli and Cesare 1999). The two steps involved in log modeling include:…”