Effects of the dip angle in the induction anisotropy logs

Abstract

Some of the most modern induction well logging tools provide resistivity anisotropy logs and estimates of the electrical resistivity of sand laminae in thinly laminated formations.In this work, coaxial and coplanar logs were modeled in one-dimensional (1D) laminated packages, neglecting the presence of the borehole and the invasion zones, to simulate geological environments of hydrocarbon reservoirs with electrical anisotropy.The objective of this paper is to perform an analysis of the effects of the well's inclination angle on the induction tool response in a thinly laminated reservoir. Thus, it's shown only the responses from coaxial and coplanar coil array, which are used to produce anisotropy logs as well as to estimate the sand conductivity of the formation.The results show the strong sensitivity of the coaxial and coplanar signals to the deviated angle and, consequently, these angle's effects on the anisotropy logs.