| Abstrakt: |
Tectonic mechanism is well-known to implicate conditions influencing the dynamics of poroelasticity. This phenomenon is also associated with the role of loading factor, hence pore pressure is strongly affected by tectonic regimes. The study aims to evaluate the effect of effective stress on pore pressure and velocity relationship, particularly when the impact of the loading mechanism is not prevailing. The research data was originated from several wells in Rantau Field, North Sumatra Basin, Indonesia. This oil field is located in the transcurrent fault structural area, where thrust fault regime becomes deeper, and is assumed to be a strike-slip fault regime, obviously observed from seismic-magnetoteluric data interpretation. The log data, including sonic, resistivity and density were selected to accompany seismic data acquired in 1994, due to the fields actively producing property. Therefore, the initial and historical production data up to 2017 were coupled. The result shows an increment in pore pressure, following the water injection activity, which further triggers matrix bonding, and increases the velocity values. This phenomenon is not common on instances where there is a normal fault tectonic regime. [ABSTRACT FROM AUTHOR] |
