Inversão de Temperaturas de Fundo de Poço para Determinação de Gradiente Geotérmico - Aplicação a Dados do Campo de Pineview (Utah, EUA)

This work presents a geothermal study of Pineview oil field located in the state of Utah, USA. This study is characterized by two different stages: (1) the treatment of Bottom-Hole Temperature (BHT) data using the Horner’s method in order to reduce the effects of disturbances related to the circulation of drilling mud and (2) the inversion of the BHT data to determine the geothermal gradient of some formations from a crosssection of Pineview field using Singular Value Decomposition (SVD). Initially, the inversion was tested in synthetic models to show its effectiveness. The inversion results revealed to be valid in the presence of enough information, in other words, when the linear system of equations is overdetermined or determined. The second step consisted in the inversion of real data and compared to values found by Deming and Chapman (1988) for the same region, resulted a reasonable accuracy in the determination of the geothermal gradients of some layers. Thus, the SVD method for geothermal data inversion demonstrated to work as an useful tool to estimate the geothermal gradients of layers.