Abstract

Changes in rock properties, fluid content and their combination can be related to multiple seismic and electromagnetic (EM) anomalies. Rock physics models are commonly used to better understand the underlying physics of observed log responses and how they are governed by local petrophysical properties (Smith, 2011). In this study from the Gulf of Mexico, we present a case that shows a strong EM anomaly that can be tied to the rock properties at the wellbore location by generating 1D controlled source EM (CSEM) models. This feasibility study aims to understand the impact of elastic and electric reservoir properties using the discovery well as the calibration well for such anomaly response in a Miocene reservoir. Theoretical rock physics models are used to predict elastic curves bulk density (ρ_b), p wave velocity (V_p), and s wave velocity (V_s) at in situ conditions, and then main reservoir rocks are perturbed in terms of water saturation by applying Gassmann theory in the elastic domain, and modified Simandoux’s relationship in the electrical domain. Seismic feasibility is accomplished using synthetic seismograms and CSEM feasibility is achieved by calculating the synthetic amplitudes.