Studies on seismic anisotropy in E & P geophysics

Estimation of elastic constants in low simmetry anisotropic media is consid ered a proper method to meet PDVSA's needs to structurally and stratigraphi cally explore and exploit complex reservoirs mainly fractured reservoirs Ac cordingly a study on seismic wave propagation in elastic media, and an esti mation of variables correlated with subsoil lithology are performed. A kine matic study is completed and new technologies to reduce anisotropy effects of medium on seismic data were developed including ray tracers tomography s peed analysis, and migration in transversely and orthorhombic isotropic med ia. A modeling code in transversely media is generated, using an acoustic a pproximation of elastic wave equation for the seismic migration and determi nation of acquisition parameters in complex media. Development of sole code to determine position of conversion points corrects using normal moveout, migrates and compiles seismic data from converted waves (all in one stage), considerably reduces multi-component data processing lime, and generates r eliable seismic images to locate wells. Al present studies on current corre lation between fracture parameters (orientation, density, presence and satu ration of fluids, etc.) and behavior of amplitude variations with offset as sociated to anisotropic parameters are performed.