Subsurface

Subsurface (rock-cavern) strategic crude stockpile operating dataset from three Japanese national petroleum stockpile bases — Kuji (Iwate), Kikuma (Ehime) and Kushikino (Kagoshima), ~1.75 million kL each. The central instrument room's operations-management system continuously logs crude receipt through discharge, weather and sea-state data collection, safety/disaster systems and environmental-treatment plant status. Layered on top are decades of integrity monitoring records: daily and periodic facility inspections, rock-mass cavern-wall condition surveys from service tunnels, and a groundwater observation-well network logging water level plus oil and gas leakage detection around each cavern field — a unique long-run hydrogeological and rock-mechanics record for ~40 m-deep underground oil storage.

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Coverage

Universe, instruments and categories.

Industry: Oil & Gas Storage & TransportationPetroleum Refining and Marketing
Instruments: commoditiesequities

Dataset card

Type: not stated
Format: Mixed: tabular time-series (tank/cavern level, throughput, meteorological and sea-state readings from the central instrument room) plus structured inspection logs and text survey reports (cavern-wall and groundwater-well records)
Volume: Total monitored capacity 5.25 million kL across three bases (1.75 million kL each, held in rock-cavern units of 2+4, 3 and 3 units respectively). Continuous supervisory telemetry from three 24/7 instrument rooms plus a distributed groundwater-well network gives order 10^7-10^8 sensor readings over the operating life, with inspection and survey records in the tens of thousands. Estimate from disclosed capacity, unit and well-network structure; no counts are published.
Users: N/A — state-contracted stockpile operator with no user-facing product. Scale anchor instead: 217 employees (1 April 2026) and 7.9bn yen revenue (FY ending March 2026).
History: 33 years
Update frequency: not stated
Growth: Mature / static — the three bases were filled between January 1993 and April 1994 and the operating mandate has been continuous since the February 2004 reform. Headcount (199-217 depending on basis) and a 7.9bn yen revenue line are stable, and the business is a fixed national asset rather than a growing product.
Launched: 1986 (incorporated 22 May 1986 as a national stockpile construction company); the data asset itself starts with first oil-in — January 1993 at Kushikino, October 1993 at Kuji, April 1994 at Kikuma.
Delivery: not stated
Entity mapping: not stated
Sample: not stated
Point-in-time: not stated
Licence: not stated

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