MLchartDataset catalogue

Flexural mode

Term · Oil and gas · MLC-T-OAG-004326

A dispersive acoustic mode of a fluid-filled borehole, excited by a dipole source, in which the borehole wall is displaced from side to side as the wave travels along the hole. At low frequency its velocity approaches the formation shear velocity, so it is used to measure shear slowness in slow formations where no shear headwave exists, and its splitting reveals shear anisotropy. It differs from compressional and shear headwaves, which are refracted along the wall at fixed velocities.

Table 1. Record
IdentifierMLC-T-OAG-004326
FieldOil and gas
SubjectFormation Evaluation
Record as JSON 
{
  "id": "MLC-T-OAG-004326",
  "term": "Flexural mode",
  "field": "Oil and gas",
  "definition": "A dispersive acoustic mode of a fluid-filled borehole, excited by a dipole source, in which the borehole wall is displaced from side to side as the wave travels along the hole. At low frequency its velocity approaches the formation shear velocity, so it is used to measure shear slowness in slow formations where no shear headwave exists, and its splitting reveals shear anisotropy. It differs from compressional and shear headwaves, which are refracted along the wall at fixed velocities.",
  "subject": "Formation Evaluation",
  "url": "https://mlchart.com/terminology/oil-and-gas/flexural-mode/"
}

Record 1,566 of 4,468 in Oil and gas terminology (MLC-0103). Request the full dataset.