Home – Home – Jornals – Russian Geology and Geophysics 2004 number 6

A new method of fluid-stress modeling on the basis of 3D seismic and drilling data provided new information on the stress conditions and the hydrodynamics of the U₁ Upper Jurassic sand reservoir in the Arigol field. It is suggested to detect and outline oil fields and divide them into isolated traps each marked by low overburden pressure and fluid-trapping properties on the basis of correlation between the structural pattern and mapped stress. In the new fluid-stress model, contour lines of constant anomalous overburden pressure ( = const) are used as outer hydrodynamic barriers for hydrocarbon migration and the geometry of fluid flow lines (horizontal pressure gradients) corresponds to barriers between traps. The areas of the detected fluid-stress traps depend on the choice of the boundary values of constant overburden pressure and its horizontal gradients. It is suggested to map fluid-stress traps and to predict their sizes in a way similar to that for structural-depositional and structural-stratigraphic traps. Deep drilling within the hydrodynamically screened traps should be undertaken if they fall into the most contrasting and unexplored _min anomalies, with the aim to estimate the fluid-stress properties of the section. Unlike the traditional methods of hydrodynamic modeling, the new method is based on 3D multicomponent seismic exploration data (V_P, V_S, ).