FRACTURE CHARACTERIZATION USING DIRECTIONAL ELECTROMAGNETIC RESISTIVITY MEASUREMENTS

摘要

A disclosed fracture characterization method includes: collecting three-dimensional resistivity measurements of a volume surrounding an open borehole; analyzing the measurements to determine parameters describing fractures in the volume; and providing a report to a user based at least in part on said parameters. A fluid with a contrasting resistivity is employed to make the fractures detectable by a directional electromagnetic logging tool in the borehole. Illustrative parameters include fracture direction, height, extent, length, and thickness. The resistivity measurements can be augmented using a borehole wall image logging tool. Also disclosed are fracturing methods that include: positioning a directional electromagnetic logging tool proximate to a formation; fracturing the formation; monitoring fracture progression with said tool; and halting the fracturing when measurements by said tool indicate that a predetermined set of criteria have been satisfied.

主权项

1. A fracturing method comprising:
positioning an electromagnetic resistivity tool in a borehole proximate to a formation; obtaining a borehole wall image log; obtaining three-dimensional (3D) resistivity measurements collected, as a function of different depths, azimuths, and radial distances from the borehole, by the tool; and combining information from the borehole wall image log with the 3D resistivity measurements to determine at least one fracture parameter.