2D seismic data interpretation and rock physics to model the subsurface rocks, Kadanwari area, Sindh Pakistan (P-1047) (MFN 3031)

Abstract

of faults indicates the extensional regime in the area. The faults are normal faults and form horst and grabben structures. Prominent reflectors are marked and formations are identified on seismic data. The expected reservoirs in the area are B sand and C sand of Lower Goru Formation. The two way travel time and depth structure contour mapping of marked reflectors is done on base map. Traps are identified on contour maps. The Lower Goru sands are proven reservoirs in the study area and the surrounding fields. Therefore, accumulation of hydrocarbons is most probable in the identified traps of both C sand and B sand of Lower Goru formation in study area. The analysis of expected reservoirs B sand and C sand is done using rock physics. The relationships between Vp, Vs, Porosity, Density, Depth, Vp/Vs and Elastic Parameters help us to understand the changes in B sand occurred due to overburden, tectonic activities, transition zones, increase in depth, porosity and due to the presence of fluids in the reservoirs. The Vp, Vs, Porosity, Density, Depth, Vp/Vs and Elastic Parameters are calculated on well data and their plots are drawn versus depth which show the changes in their values at different depths. The Vp, Vs, Porosity and Poisson’s ratio calculated on seismic lines are extended throughout the area using contour maps. The contour maps explain the variations of calculated parameters in the area. The porosity of expected reservoirs is identified to be good enough for accumulation of hydrocarbons. The higher values of Poisson’s ratio in some areas show the presence of hydrocarbons and especially in the identified structure location.