METHOD AND SYSTEM FOR DIRECT SLOWNESS DETERMINATION OF DISPERSIVE WAVES IN A WELLBORE ENVIRONMENT

摘要

A system and method for effective estimation of properties of a formation using acoustic array processing is disclosed. An acoustic tool is directed to a zone of interest in the formation and generates a first signal. Real data corresponding to the first signal is then received. One or more basic parameters are provided as input. The basic parameters may include parameters relating to the acoustic tool or parameters relating to the zone of interest. A time semblance shear slowness and a frequency semblance shear slowness are determined using the basic parameters. A mask is then selected using the determined time semblance and frequency semblance shear slowness values and used to isolate a dispersion curve. A shear slowness value is selected from the dispersion curve and quality control is performed on the selected shear slowness value.

主权项

1. A method for fracture identification and characterization, comprising:
positioning a magnetic dipole transmitter and a magnetic dipole receiver within a borehole in a subterranean formation, at least one of the magnetic dipole transmitter and the magnetic dipole receiver being tilted with respect to an axis of the borehole; generating a time-varying electromagnetic (EM) signal with the magnetic dipole transmitter; measuring a response of the formation to the time-varying EM signal using the magnetic dipole receiver, the response comprising at least two depths of the formation and at least two azimuthal orientations of the formation with respect to the axis of the borehole; generating a first image of the formation based, at least in part, on the response; and determining at least one fracture characteristic based, at least on part, on the first image and a synthetic fracture image.