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Abstract

Apart of geostructure, routinely delivered by 3D seismic, estimates of pore pressure, rock fracturing, and triaxial stress<br>are needed for efficient directional and horizontal well planning. We show how 3D distributions of these parameters can<br>be mapped by means of geomechanical modeling based on the use of depth velocity model, created in the course of<br>prestack depth migration and enhanced by azimuthal analysis of interval velocities and angle-of-incidence dependent<br>reflectivity. The anisotropic velocity model is converted into 3-D distribution of the rock elastic moduli, angles of<br>internal friction, rock cohesion, and plastic relaxation constants. Considering the fluid-saturated rocks as an undrained<br>anisotropic elasto-plastic medium subjected to lithostatic and tectonic stresses, and applying a fast Lagrangean code<br>formalism for numerical geomechanical modeling, 3-D cubes of expected pore pressure, intensity of fracturing caused<br>by shear strains, and parameters of principal horizontal components of the stress are created for the area studied – a<br>Middle Priob’e’s oil field in West Siberia.

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/content/papers/10.3997/2214-4609-pdb.38.F226
2003-09-01
2020-04-06
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609-pdb.38.F226
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