This is an abbreviation for a well log used in the oil and gas industry. You could find this abbreviation NROB in your log evaluation software or any (ASCII) log files provided by the logging company. Bulk Density, Enhanced Vertical Resolution, Bottom is the full name for this log. The business value of this log is often deamed high.

The values of this log represent the density of bulk material, including any void space or other materials contained in the subject volume. In well logging, it is the density of the rock, including fluid-filled pore space, as measured with a "Gamma-Gamma" type logging device.

Simply said, this is a log that describes the density (mass per unit volume) of a material. Usually at Standard conditions (STP). Also used to indicate the frequency of occurrence.

This log usually has the unit 'Mass Per Volume'.

Data for this log is produced by a tool that uses a density logging technique and can be used to investigate the density of the formation. Similar logs are listed below:

• Smoothed Bulk Density-Compensated (SBDC)
• Smoothed Standoff Correction (SCOR)
• Bulk Density Image, Quadrant (RBIM)
• Short Spacing Bulk Density, Real-Time (ROSA)
• High Resolution Bulk Density (HRHO)
• Maximum Bulk Density, Enhanced Vertical Resolution (NROM)
• Near Detector Only Bulk Density (NBD)
• Density Ticks, 0.1 ft (TICK_DEN)
• High Resolution Density Correction (HDRH)
• HRDD Spine and Ribs Density Correction (HDRA)