Run oil operations with total
OAS
Specialist software for oil logistics, measurement, and accounting accuracy.

The world's leading operators and terminals trust Maron.
Your foundation for smarter oil operations
Our Product
Unified Data Capture
Capture every movement, shipment, and tank reading in one trusted system.
Inventory Oversight
Manage inventory, quality, and ownership across refineries and terminals.
Accounting Accuracy
Generate accurate mass balances, accounting reports, and regulatory filings.
Seamless Integration
Integrate seamlessly with ERP, process historians, and external movement systems.
See how OAS works
Explore the full suite of capabilities that transform oil operations into accurate, actionable insight.
Get Started

Operations, Accounting & Shipping
One system. Every movement.
Nomination Lifecycle
Track full journey from trader input to completion.
Document Automation
Auto-generate jetties, bills, and notifications.
Automated Accounting
Post mass balances and voyage data automatically.
Operational Alignment
Ensure operations and accounting share a single source of truth.
Berth Planning & Jetty Scheduling
Smarter schedules. Smoother sailings.
Real-Time Visibility
See upcoming and in-progress berth movements.
Jetty Scheduling Tools
Manage delays, sequencing, and slot conflicts.
Alerting & Conflicts
Surface clashes before they affect operations.
Live Movement Sync
Jetty plan updates automatically as shipments change.
Inventory Management
Know your stock. Control your flow.
Tank Inventory Views
Monitor every tank’s contents in real time.
Measured vs Expected
Instant variance checks and alerts.
Stock Reconciliation
Automatic balancing of movement and inventory data.
Historical Tracking
Review historical inventory positions over time.
Connected insights. Better decisions.
Reporting & Integration
Custom Dashboards
Configure KPI dashboards to showcase operational success.
Flexible Reporting
Export standard or custom reports in any format, with delivery instructions for how, where, and when they arrive.
System Connectivity
Integrate with ERP, Movement System, LIMS, and Process Historian.
Event Notifications
Track integration activity and alerts in real time.
Demurrage Management
Forecast, track, and reduce costs
Structured Data Capture
Enforce key events and timing rules with disciplined entry.
Performance Benchmarking
Track KPIs and compare estimates against invoices.
Berth & Vessel Visibility
Filter schedules by priority for full operational oversight.
Optimised Planning
Drag-and-drop tools with constraint checks enhance berth allocation.
Terminal Operations
Terminal tools. Real-time control.
Off-Site Inventory Tracking
Monitor stock at remote storage locations.
Multi-Owner Visibility
Track movements and ownership across shared terminals.
Integrated Terminal Data
Feed terminal activity into central accounting and planning.
Regulatory Compliance
Generate reports to maintain operational transparency.
Loss Control
Terminal-Level Event Monitoring
Volume & Movement Events
Record tank levels, transfers, and operational events.
Ownership Reconciliation
Match terminal activity with inventory and ownership data.
Discrepancy Alerts
Detect inconsistencies and potential losses early.
Accounting Integration
Link terminal events directly to mass balance and financial reporting.




