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Logging While Drilling Resistivity Responses in TTI FormationNormal access

Authors: X. Hu, Y. Fan, X. Yuan, H. Li, P. Zhang and Z. Wu
Event name: 81st EAGE Conference and Exhibition 2019
Session: WL & LWD Processing and Interpretation
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201901656
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.01Mb )
Price: € 20

Anisotropy is one of the important factors that affects the response of electromagnetic resistivity logging while drilling. For real-time inversion and fast reconstruction of formation true resistivity, the forward modeling of electromagnetic resistivity logging while drilling is usually based on the transversely isotropic formation model with vertical symmetry axis (VTI medium), but it only considers the horizontal and vertical resistivity. It has certain limitation during the realistic application. In this paper, a forward calculation method of electromagnetic resistivity logging while drilling in TTI strata is presented. The proposed algorithm is verified by numerical examples. Numerical simulation shows that there exist critical relative borehole dip and critical anisotropy dip angles in TTI formation. Electromagnetic resistivity logging while drilling responses follows different rule before and after these two these two critical angles.

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