Seismic data interpretation of Tajjal Area Alongwith Spectral Decomposition, Colored Inversion, Petrophysics, Rock Physics and Facies Analysis using well log data of GORWAR-01

Abstract

Upper Goru and Lower Goru formation tops are marked on the assigned seismic lines showing potential zones in both formations. Uplifted block due to normal faulting is confirmed by forming time and depth contour maps along with faults, that pin point the location of hydrocarbon accumulation. Petrophysical analysis is done by using well Gorwar-01. Volume of shale, density porosity (PHID), effective porosity (PHIE.), water saturation (SW) and hydrocarbon saturation (SH) are estimated for marked reservoir zones that show high potential by simply seeing the logs collectively. However, zone-03 and zone-05 are desired potential pays, according to interpretation and calculated values. The water saturation and hydrocarbon saturation in zone-03 appears 53.53% and 46.67%, respectively and in zone-05 it is about 48.94% and 51.06%, respectively. Facies analysis for sand and shale alternative beds is done by using well logs and sand reservoirs at the depths at which zone-03 and zone-05 are marked are confirmed. Finally, rock physics is carried out that uses elastic/engineering properties for the Upper Goru and Lower Goru formations and crossplots are generated. Attributes i.e. Spectral Decomposition and Colored Inversion are carried out to confirm the location and depth of the prospect zone. Potential zones with grids are generated and new reservoir depth is estimated and recommended i.e. 4607m for the production of hydrocarbon.