How to use map tools to define a proposed drilling spacing unit
A proposed drilling spacing unit (DSU) is a working boundary used to assess how one or more wells may be developed across a defined tract. In shale plays, the boundary can help align lease interests, mineral ownership, drilling plans, infrastructure access and likely development economics before a final unit is approved by a regulator or confirmed through title work.
Shale Navigator provides an interactive US-focused mapping environment for this early-stage analysis. Its draw and measure tools allow you to sketch a candidate unit, check its dimensions, compare it with leases and mineral rights, and record the assumptions behind the proposed layout. For Australian users assessing US opportunities from Brisbane, Perth, Sydney or elsewhere, the workflow is especially useful when local teams need a clear visual reference for assets held in miles, acres and US state regulatory systems.
Set the map context before drawing
Begin by opening the relevant shale play and navigating to the county, township or project area where the proposed unit is located. Zoom in far enough to see parcel boundaries, leases, existing wells and relevant infrastructure, while keeping enough surrounding context to identify roads, pipelines and adjacent development. A boundary drawn at an unsuitable zoom level can easily cross a parcel line or miss a nearby well pad.
Turn on the layers that influence the proposed spacing unit. Depending on your objective, these may include shale play outlines, drilling permits, lease offers, available mineral rights, property data, pipelines and existing well locations. Layer visibility matters: a clean base map can help you draw accurately, while additional overlays reveal whether the candidate unit is constrained by ownership, existing commitments or access routes.
Australian analysts should also pay attention to units. US oil and gas datasets commonly use acres, feet, miles and township-range references rather than hectares, metres and cadastral lots. A practical approach is to record both the native US measurement and an approximate metric equivalent in your project notes. For example, 640 acres is approximately 259 hectares, although the legal description and regulatory treatment remain US-based.
Draw the proposed unit boundary
Use the draw tool to trace the outside edge of the proposed DSU. Place points at each change in direction, following parcel lines, lease boundaries, survey references or a planned geometric shape. For a rectangular development concept, four carefully positioned points may be enough; for a unit shaped by irregular mineral ownership, roads or existing wells, add vertices wherever the boundary needs to turn.
Complete the shape using the tool’s close or finish control. Before relying on the result, inspect each corner at a closer zoom level. A single misplaced vertex can materially change the acreage, especially in a narrow development corridor. If the application allows editing, move individual points to refine the boundary rather than deleting and redrawing the entire shape.
The first sketch should represent the commercial or engineering assumption you are testing, not an assertion that the unit is legally established. A candidate boundary might follow a lease block, centre on a proposed horizontal well path, or cover a group of adjacent tracts intended for coordinated development. Keep a note of why each edge was selected so that a landman, engineer, attorney or investment committee can understand the reasoning later.
Use measurement to test the geometry
After drawing the polygon, use the measure function to check its area and perimeter. Area is the central test for a proposed spacing unit, while perimeter helps reveal whether the shape is compact or unusually elongated. A large perimeter relative to the area may indicate additional road, gathering or pad-access costs and can make ownership coordination more complicated.
The distance tool is useful for checking setbacks, well spacing, pad locations and the relationship between a candidate unit and nearby infrastructure. Measure from a proposed pad to a lease edge, from one well location to another, or from the boundary to a pipeline or road. In shale development, these distances can expose practical constraints that are not obvious when looking only at acreage.
Repeat the measurement after every meaningful edit. If you change one corner to keep the boundary inside a lease or avoid a surface obstacle, the area may shift enough to affect the development concept. Compare the measured result with the spacing assumptions being used by the operator, regulator or technical team. A map-based estimate is a planning aid; it does not replace a survey, title opinion, pooling order or state-specific spacing determination.
Compare the drawing with ownership and activity
Once the geometry is stable, compare the proposed unit against leasehold and mineral-rights information. Look for split ownership, gaps between leases, unleased tracts, overlapping offers and parcels that appear to sit outside the operator’s control. The drawing can reveal that a seemingly simple unit requires several owners to coordinate, or that a small tract could affect the economics of a horizontal development.
Existing wells and drilling permits provide another important comparison. A proposed DSU that overlaps an active permit, producing well or previously planned pad may need a different orientation or a more careful regulatory review. Pipeline corridors and roads can influence surface access even when the minerals are continuous. These overlays are particularly helpful when reviewing opportunities remotely from Australia, where a map may be the quickest way to understand a US county before arranging local title, engineering or field support.
For a repeatable workflow, save a dated version of the map and retain the measurements used in your analysis. Exporting the underlying lease information can support later valuation and due diligence; Shale Navigator’s lease export fields provide a useful reference for deciding which attributes deserve to travel with the drawing.
Record, export and review the result
Treat the proposed DSU as a working scenario rather than a static map mark. Give it a clear name that identifies the play, county, project, date and scenario, such as “Permian candidate unit – Reeves County – 2025 concept A”. Add notes describing the assumed acreage, target formation, planned well count, ownership basis and any exclusions made during the drawing process.
Before sharing the result, check that the map is centred on the correct property and that all relevant layers are labelled correctly. Confirm whether the boundary is based on parcel lines, lease lines, a geometric acreage target or a proposed well-development pattern. If the tool supports screenshots, exports or saved projects, keep a copy with the accompanying assumptions so another reviewer can reproduce the analysis.
You can also use the platform’s data store to locate supporting datasets for the area being assessed. This is valuable when the boundary needs to be tested against additional property, permit or mineral-rights information rather than relying on a single visual layer. Australian firms evaluating US assets should preserve the original US units and legal references in the source material, then add metric conversions separately for internal reporting.
Practical checks before you rely on the boundary
A short review routine can prevent an attractive map from becoming a misleading development assumption:
- Confirm the proposed acreage and perimeter using the measure tool after the final edit.
- Check that the boundary does not unintentionally cross a lease, parcel, county or state line.
- Compare the shape with existing wells, permits, pads, roads and pipeline corridors.
- Identify every mineral-rights or lease tract that appears to fall inside the candidate unit.
- Record the map date, data layers, measurement units and assumptions behind the drawing.
- Obtain title, regulatory and engineering review before treating the sketch as an actionable DSU.
The review should reflect the purpose of the map. An investor may need a quick acreage and ownership screen, while a landman may need tract-level detail and a legal description. An engineer may focus on lateral length, pad placement and infrastructure, whereas an attorney will be concerned with pooling, spacing orders, lease language and title certainty. The same drawn boundary can support each conversation when its limitations are documented clearly.
For teams that need to test several scenarios, a subscription can provide access to additional data and features through Shale Navigator plans. A free seven-day account may be suitable for an initial assessment, while ongoing acquisition, leasing or portfolio work may justify a broader subscription.
Use the draw and measure tools to turn an early development idea into a transparent, reviewable spatial assumption. Start with the relevant US shale play, build the boundary from visible evidence, measure it carefully, compare it with ownership and activity, and preserve the reasoning behind every change. When the map is ready, share it with your land, engineering, legal and investment teams as a common reference for the next stage of due diligence.