Hydrocarbon Evaluation Using Geological, Geophysical and Well Data Analysis of Bitrisim Area (P-1066) (MFN 3262)

Abstract

The seismic interpretation of Bitrisim area was done to identify the faults in the study area, in order to identify the structural and stratigraphic traps which may exist in the block. The faults indicates an extensional regime in the area. These are normal faults and form horst and graben structures. Prominent reflectors are marks and formation are identified on the seismic data. The target horizon was Lower Goru Formation which is the proven reservoir in the area. The basal part of Lower Goru Formation contain substantial organic content which act as source to B Sand of Lower Goru Formation. The TWT and depth structure contour mapping of marked reflectors was done. Traps were identified on contour maps. The analysis of expected reservoir B Sand is done using rock physics. The relationship between Vp, Vs , Porosity, Density, Depth , Vp/Vs and Elastic Parameters help us understand the changes that resulted in B Sand due to overburden, tectonic activities, transition zones, increase in depth, porosity and due to the presence of fluids in the reservoir. The rock physics information was correlated with Petrophysics data which was obtained from well Fateh-01. Water resistivity, water saturation and hydrocarbon saturation in the reservoir was established. Using GR log lithology variation with depth chart was constructed. Further using Shale cut-off, water cut-off a net pay zone was established whose thickness came out to be 6m. Further, using the GR log curve , the environment of deposition was noted and hence forth, the stacking pattern was established. Furthermore, 1D forward modeling of the study area was done only to confirm our Poisson’s ration variation trend in our study area and more importantly our reservoir. Synthetic seismogram was also constructed to correlate the lithologies on the seicmic section with the well data in order to have the well control.