Print this pageNew NMR-Based Methodology for Inferring the Presence of Movable Heavy Oil in Reservoir Layers
The present contribution is the result of the author’s several experiences in NMR analysis on reservoirs of sandstone with argillaceous-tuffaceous matrix belonging to geological formations of the Cretaceous age. It is intended to highlight the advantages (and synthetically shows the main aspects) of the use of NMR tools for the characterization of movable heavy oil bearing continental clastic reservoirs of the Gulf of San Jorge Basin in Argentina.
The methodology presented is for inferring the presence of movable heavy oil in reservoir layers of fluvial volcanic environment. It is based on five main principal indicators: reservoir pressure, development of Spontaneous Potential, increase of the Resistivity response of the layer, the slope of the T2logmean of the furthest right hand side lobe of the T2 distribution when plotted in depth, the presence of water based mud filtrate in the DT2 maps and the NMR permeability. When these indicators are considered, the prediction of the layer can be forecast with high probability. This work summarizes the uses of these interpretations in order to improve the liquid heavy oil recovery in these reservoirs. The present approach has been validated with hard data from production tests.
AAPG Search and Discover Article #90100©2009 AAPG International Conference and Exhibition 15-18 November 2009, Rio de Janeiro, Brazil