Authors(s): Ravi Kant1*, S.P. Maurya1, Nitin Verma1, Raghav Singh1, K.H. Singh2, Ajay P. Singh1, Prabodh K. Kushwaha1, M.K. Srivastava1, G. Hema1, Harsha
Date of Publication: January, 2025
Publication reference: J. Ind. Geophys. Union, 29(1) (2025), 26-37
Abstract:
The development, management, and optimization of a reservoir depend on precise reservoir characterization. There are several methods for doing this, however in the current work, seismic inversion based on the hybrid particle swarm optimization (HPSO) methodology is used. In this method, a local optimization method called quasi-newton method (QNM), combined with a global optimization method called PSO to maximize their benefits and minimize their downsides are used. The global optimization method takes a lot of time to converge whereas, Quasi-Newton method is rapid, but heavily dependent on the initial model. The present study takes these two limitations into account. To characterize the reservoir, the hybrid PSO uses post-stack seismic data to predict acoustic impedance and porosity in the inter-well zone. The effectiveness of this newly devised method is first evaluated using synthetic data, and then it is applied to the real data from the Blackfoot area in Canada. The findings show that for both the synthetic and real data, the inverted outcomes closely match the observed data. The analysis anticipated that the inter-well acoustic impedance and porosity volume would vary from 6000 to 12000 m/s*g/cc and 5-22%, respectively. These volumes display extremely detailed subsurface data. The analysis of inverted findings reveals an abnormal zone inside the two-way transit time frame of 1045 to 1065 ms, ranging from low-impedance 6500-9000m/s*g/cc, and high porosity >15%. This unconventional area is classified as a reservoir. The method is particularly useful in nearby regions where detailed subsurface information needs to be estimated, even with limited prior data.
Keywords: Seismic inversion, Hybrid optimization, Particle swarm optimization, Quasi-newton method, Reservoir characterization, Blackfoot field (Canada)