Título: Applications of azimuthal anisotropy from dipole shear sonic in western Venezuela

Autor: Johnston L K.; Campo O.; Viloria O.

Evento: SPE Int. Petrol. Conf. of Mex., pp. 33-41 1996 SPE-35291

Lugar y fecha del Evento: Villahermosa, Mex, Mar. 5-7

Descriptores: Sonic Logging; Elastic Wave: Elastic Wave Logging; Force; Fractured Reservoir; Geologic Structure; Interpretation; Reservoir; Rock Stress; Shear Wave; South America; Stress; Venezuela

Año: 1996

Pais de publicación: Mexico

Tipo de documento: Conferencia

Resumen

Well-bore mechanical properties have been used to model formation responses when planning highly deviated wells, horizontal wells and fracture treatments. Now, with the inclusion of the maximum stress direction and horizontal stress ratio, a complete model of the formation response to stress can be obtained. The fact that shear waves will split and become polarized parallel and perpendicular to natural fractures is well documented. The fact that the fast shear wave is oriented in the direction of the maximum horizontal stress is also well documented. Cross dipole shear data from a digital sonic tool is processed to obtain oriented fast and slow shear waves. The theory of shear anisotropy processing is reviewed and the quality control and interpretation of the resulting anisotropy log are discussed. For this case study, azimuthal anisotropy data obtained from dipole shear sonic logging in W. Venezuela is used to determine the direction of maximum horizontal stress and horizontal stress ratio.