Abstract

3D Geocellular modeling has been used to perform the geological prognosis of the single and multilevel horizontal wells under drilling in Mumbai High Field. Close grid 3D seismic interpretation has been done and the structure maps at the top of main reservoir layer L-III and its various sub layers top viz. A2-I, A2-II, A2-III, A2-IV, A2-V, A2-VI, A2-VII, B & C were prepared. A 3D Geocellular correlation framework was constructed using these structural grids having the areal resolution of 100*100 meters and vertical resolution of 0.5 meters approximately which guides the distribution of reservoir data throughout the model. Processed logs of various rock properties like porosity, water saturation, shale volume etc. were used from 197 wells and populated in the resulting geocellular reservoir model. Each cell of the resulting model holds heterogeneous rock, fluid property etc. for interactive visualization and modeling. Cross section taken along the horizontal drain hole section from 3D Geocellular model provides the information of the sub-sea depth of target layer, the depth of the sweet zone within the target layer and also the structural and rock property variation along the horizontal section. This kind of geological prognosis of different high-tech horizontal wells has proved to be of immense help to the well site geoscientist in deciding the drilling course of horizontal section of the well once the landing point is reached and the results have been cross validated in subsequently drilled horizontal wells under the redevelopment plan of the Mumbai High Field.