Fractured Rock Characterization by Tracer Injection

Amin Sharifi
Supervisors: H. Hassanzadeh, J Abedi, J. Chen


Fractured rock is very important when we study the natural fracture reservoirs, shale gas reservoirs, and waste repositories. Problems include the Commercial reservoir simulators only contain a single size matrix block and use a pseudo steady-state, which leads to error in predictions of mass transfer process. In addition, hydrogeology, petroleum engineering also face this problem because of tools for reservoir characterization (well testing, well logging, seismic…), which also leads to error in predictions of mass transfer process.  Therefore, solving the mass transport problem including transient & PSS processes with variable rock block size will enhance oil recovery predictions from fractured rocks and provide accurate design of waste disposal (hydrogeology). More important, the generating type curves provide a new tool for reservoir characterization along with other existing tools.

Rock matrix block size distribution has great impact on reservoir response during mass transfer process, which can be used as a signature for reservoir characterization. Different parameters of dispersivity, peclet number, porosity, adsorption/desorption, fracture intensity must be accounted in the modeling of fractured reservoirs. New type curves for reservoir characterization cover the whole heterogeneity of the reservoir domain by considering fluid transport in fractured rocks. Additionally, this new reservoir characterization method can be employed along with other characterization tools; well testing, well logging, seismic.