Patent · US Active

Multilevel workflow method to extract resistivity anisotropy data from 3D induction measurements

US8433518B2 · kind B2 · utility

22Cited by
10References
14Claims
0Family size

Assignee

Inventors

Key dates

Filing dateSep 22, 2010
Grant dateApr 30, 2013
Priority date
Expiry dateApr 9, 2031

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01V3/28
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A method is provided for determining formation resistivity, anisotropy and dip from wellbore measurements includes moving a well logging instrument through subsurface formations. The instrument includes longitudinal magnetic dipoles and at least one of tilted and transverse magnetic dipoles. Formation layer boundaries and horizontal resistivities of the formation layers are determined from longitudinal magnetic dipole measurements. Vertical resistivities of the formation layers are determined by inversion of anisotropy sensitive measurements. Improved vertical resistivities of the formation layers and dips are determined by inverting symmetrized and anti-symmetrized measurements. Improved vertical resistivities, improved boundaries and improved dips are determined by inversion of the all dipole measurements. Improved horizontal resistivities, further improved layer boundaries and further improved dips are determined by inversion of all dipole measurements.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.