|Publisher||Society of Petroleum Engineers||Language||English|
|Content Type||Conference Paper|
|Title||Triaxial Induction Logging: Theory, Modeling, Inversion and Interpretation|
Hanming Wang, Tom Barber, Kouchiang Chen, Sofia Davydycheva, Mark Frey, Dean Homan, Gerald Minerbo, Chris Morriss, Richard Rosthal, Jan Smits, and Giovanni Tumbiolo, Schlumberger
International Oil & Gas Conference and Exhibition in China, 5-7 December 2006, Beijing, China
2006. Society of Petroleum Engineers
|6.6.1 Well Logging
A key challenge of developing the triaxial induction array is the large borehole effect on coplanar couplings when the tool is eccentered in the transverse direction in water-base mud boreholes. To reduce the borehole effect to a manageable level, a new design with multiple electrodes has been implemented. Tank experiments and numerical modeling results show the borehole effect is reduced dramatically by using this design.
A parametric inversion algorithm to simultaneously determine the horizontal
resistivity, vertical resistivity, formation dip, and azimuthal angle and bed
boundary position from the triaxial induction logging data will be presented.
The inversion problem is solved by employing a weighted, constrained, and
regularized Gauss-Newton minimization scheme. To archive the practical
application of the inversion
A quantitative interpretation method of water saturation in laminated shale-sand formation will be presented. Shale anisotropy is taken into account for building the interpretation model. Two field examples demonstrate the laminated shales and analysis improves the estimate of hydrocarbons in place.
Theoretical study of triaxial induction logging was performed by Moran and Gianzero4 in 1979. They concluded that, in principle, by using a coplanar system with a magnetic moment parallel to the formation bedding plane, the vertical conductivity can be measured. But, because of the large borehole effect, it was impractical to build such system. A multielectrode tool design was built to reduce the borehole effect to a manageable level5.
In this paper, we will cover the theory, modeling, inversion, and
interpretation of triaxial induction logging. In the theory part, we will
present the sensitivity of triaxial induction measurement to formation dip,
azimuth, horizontal conductivity, vertical conductivity, and bed boundary
position in transverse isotropic formations and layered formations. Current
distribution will also be presented in this section to
|File Size||1,623 KB||19|