Environmental impact correction for resistivity logging in CBM horizontal well

Reconstruction of Resistivity and Permittivity Profiles Using Electromagnetic Well Logging Data

There is low resistivity contrast between reservoir zone and host formation in geothermal fields, especially in areas where the technique of water injection is being carried out. Therefore, in low contrast area, permittivity can be one of the important reservoir indicators besides resistivity. In this study, one EM tomography method of reconstructing the resistivity and permittivity from electr...

Hybrid algorithm for inverse DC/AC resistivity logging measurement simulations

We present a hybrid algorithm for solving inverse 3D resistivity logging measurement simulation problem with DC and AC tools in deviated wells. The term “simulation of measurements” is widely used by the geophysical community. A quantity of interest, voltage, is measured at a receiver electrode located in the logging instrument. Computer simulations are used to explain obtained measurements. We...

Mineralogy from Geochemical Well Logging

-Multivariate statistical analyses of geochemical, mineralogical, and cation-exchange capacity (CEC) data from a Venezuelan oil well were used to construct a model which relates elemental concentrations to mineral abundances. An r-mode factor analysis showed that most of the variance could be accounted for by four independent factors and that these factors were related to individual mineral com...

Parallel hp-Finite Element Simulations of 3D Resistivity Logging Instruments

We simulate electromagnetic (EM) measurements obtained by using one transmitter and one receiver antenna in a borehole environment. The measurements are used to assess electrical properties of rock formations. We have started from a problem where logging instruments as well as rock formation properties are assumed to exhibit axial symmetry around the axis of a vertical borehole. The initial com...

Quantum-Well Resistivity for Perpendicular Transport in Magnetic Layered Systems