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When Conventional Meet Unconventional, Applications Of Advance Acoustic Logging In A Not So Conventional Brown Field

Abstract

In the San Jorge Basin brown fields the target reservoirs for many years has been treated as conventional reservoirs, however there are some target layers that after been tested present low flow rates due the presence of high content of tuff and/or interbedding shale, is for this reason that this zones are no longer treated as conventional reservoirs and they are hydraulic fractured to increase their oil productivity. The success of a hydraulic-fracture job depends on several factors, including the formation geology itself, the formation mechanical properties, field-stress regime (direction and magnitude), minimum horizontal stress contrast, and the transition from the simulation to the execution of the fracture job. Production companies need tools that help them determine how successfully the hydraulic fractures have optimized well production and field development. These tools should provide information about hydraulic-fracture conductivity, geometry, complexity, and orientation This paper presents the application in two wells of advance acoustic answers used in unconventional reservoirs such as anisotropic mechanical properties calculation considering TI anisotropy to obtain a more accurate minimum stress profile, the stress profile and mechanical properties obtained are used in the hydraulic fracture design. After the hydraulic fracture job a second acquisition of a sonic log is done in order to perform a Time lapse Anisotropy analysis aiming to get the propped fracture height and compare with the previous generated model. Application of the acoustic scanning platform technology as a fracture optimization tool in the san Jorge Basin tuff reservoirs allows for a comprehensive evaluation of the hydraulic-fracture geometry aiming to reduce fracture costs and improve the selection criteria of the layers to be fracture in the future wells.