Mapping Zones and Well Attributes in StarSteer - ROGII U Webinar

September 25, 2026

Written by:

ROGII Team

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StarSteer can now map two kinds of data beyond structure: zonal data, such as net sand thickness between two tops, and well attributes, such as API gravity or lateral length. Property (zonal) mapping arrived in 2025, and attribute mapping followed in StarSteer 26.1. Both build grids in the same mapping view geologists already use for structure maps.

In this ROGII University webinar, Rachel Grande, Technical Sales Manager at ROGII, works through both workflows on real projects in the Eagle Ford and the Williston Basin.

Watch the Supercut

Mapping zones and well attributes in StarSteer, presented by Rachel Grande, Technical Sales Manager at ROGII.

Key Takeaways

Zones generate from tops (A to B, B to C) or from horizons. Horizons are the better choice when a lateral never reaches the base of a zone, because averages such as ROP still calculate.
Log-to-attribute calculations turn a gamma ray (GR) cutoff into a net thickness value for every zone in every well.
Well attributes import from a spreadsheet, matched by well name or API number. The data type (number, text or date) has to match the values, or they won't import.
Where an attribute plots changes the map: mid-lateral suits production data, while wellhead placement shifts every point to the surface location.
Attribute and property maps stay within the highest and lowest input values, unlike structure maps, which use convergent interpolation to carry trends past the data.

Two Worked Examples

Eagle Ford, API gravity. In Karnes County, Texas, the session maps API gravity across 135 Lower Eagle Ford wells, using a Data Manager well list to exclude other formations. Faults along the Karnes Trough cut the grid, and a structure overlay shows thermal maturity tracking burial depth.

Williston Basin, net sand for water disposal. A 50 API gamma ray cutoff produces net sand thickness for the Inyan Kara, which is then mapped in property mode. Hand-drawn contours bring out the depositional trend and point to the southwest as the stronger location for a disposal well.

Frequently Asked Questions

What is attribute mapping in StarSteer?
Attribute mapping, added in StarSteer 26.1, creates grids from a single value stored for each well, such as API gravity, lateral length or production data, imported from a spreadsheet or the well header.

What is the difference between property mapping and attribute mapping?
Property mapping uses values calculated within zones, the depth intervals between two tops or horizons, such as TVD thickness or net sand. Attribute mapping uses one value per well that isn't tied to a depth interval.

Can an attribute map be filtered by formation?
Yes. In 26.1, well attributes can't yet be searched in the object tree, so the workaround is to filter by formation in Data Manager, save the result as a well list and select that list in the mapping window.

Where should production data be plotted on a map?
At mid-lateral. It represents the center of the producing interval, so the map reflects where production actually comes from rather than the surface location.