Pulsed neutron capture or sigma logging is widely used in the industry for identifying hydrocarbon behind the casing and also to provide time-lapse saturation surveys.

This information is highly valuable for clients looking to maximise recovery and improve reservoir understanding.

Our expert are able to interpret Sigma data from various pulsed neutron tools, providing an independent and accurate result to assist your decision making.

It is widely known that Sigma application is limited in oil reservoirs with low formation water salinity. Pulsed neutron spectroscopy, or more commonly known as Carbon/Oxygen logging, is better suited to identify oil and quantify oil saturation under these circunstances.

The most modern Pulsed Neutron tools in the market usually operate a system of two or three detectors and can record in C/O mode both to memory or in surface read-out mode.

Our team of experts are always available to help from the survey planning phase all the way to the final reporting.

Also referred to as oxygen-activation logging, this technique uses the neutron generator to activate the oxygen in a slug of water. Timing the slug’s movement to the point it is picked up by the tool’s detectors giving the flow’s velocity.

But applying this technique when looking for water flow behind casing can be a complex challenge. With ANSA’s expertise we can help plan the entire survey, greatly increasing the chances of successfully determining zonal isolation.

Also known as Spectroscopy Log, this advanced technique uses the pulsed neutron generator to establish the yields of different elements in the formation.

Elemental yields are usually given as ratios, such as Fe/(Si +Ca), C/O, Cl/H, Si/(Si + Ca) etc. To deliver absolute values the data can be related back to core samples or a model can be used.

The ANSA team experts can help you expand your understanding of the near-wellbore reservoir mineralogy.