METHODS AND APPARATUS FOR CHARACTERIZATION OF A PETROLEUM RESERVOIR EMPLOYING COMPOSITIONAL ANALYSIS OF FLUID SAMPLES AND ROCK CORE EXTRACT

摘要

A methodolgy for reservoir characterization involves downhole fluid sampling within a wellbore to collect a hydrocarbon fluid sample, and core sampling operations to collect a core sample at a location identified as a potential flow barrier in the reservoir. Laboratory analysis analyzes the compositions of the hydrocarbon fluid sample and fluids extracted from the core sample. The compositions are compared to characterize properties of the reservoir. The compositional properties of the core sample extract are compared to those of the incompatible fluid-insoluble fraction of the hydrocarbon fluid sample. If there are similarities between the compositional properties, it is inferred that bitumen of the core sample formed by a late incompatible fluid charge. If there are differences between the compositional properties and biomarkers indicative of high levels of biodegradation are present in the core fluid extract, it is inferred that bitumen of the core sample formed by biodegradation.