Applications of Organic Geochemistry in Rayoso Formation Characterization: Chihuido De La Sierra Negra, Lomita Field, Neuquina Basin, Argentina

摘要

Organic geochemistry has been widely used in oil exploration industry. However, only in the last decades, innovative applications of its methods have become known in field development activities and reservoir characterization. One powerful application is the lateral and vertical fluids continuity in reservoirs. This study was made in Chihuido de la Sierra Negra- Lomita field, Neuquina Basin, which produces from three main reservoirs: Low Troncoso Formation, Avilé Formation and Rayoso Formation. In the mature stage of field development, RepsolYpf developed an analytical technique based in organic geochemistry to discriminate the production from each reservoir in commingle produced oil samples. The goal of the present paper is the integration of the geochemistry results and the geological model of the Rayoso Formation in order to establish the lateral and vertical continuity of the reservoir fluids, seal rock quality variations and support the field developments activities. According to the obtained results, the following conclusions were reached: a) Rayoso Formation produces oils with different geochemistry characteristics and b) The geochemical characterizations of the oils produced in Rayoso Formation is going to be used as a powerful supporting technique for field development.