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Gas fields and large shallow seismogenic reverse faults are anticorrelated
G Valensise1, F Donda2, A Tamaro2
1Istituto Nazionale di Geofisica e Vulcanologia-INGV, Rome, Italy. gianluca.valensise@ingv.it.
Scientific Reports
|February 4, 2022
Summary
Productive gas wells are less common near seismogenic faults. Earthquake ruptures may lead to gas loss, suggesting intact reservoirs are often found near aseismic faults.
Area of Science:
- Geosciences
- Petroleum Geology
- Seismology
Background:
- Understanding the relationship between geological structures and hydrocarbon reservoirs is crucial for energy exploration.
- Seismogenic faults pose risks to subsurface integrity and resource containment.
Purpose of the Study:
- To investigate the spatial correlation between seismogenic faults and gas wells in Italy.
- To assess the impact of fault activity on hydrocarbon reservoir viability.
Main Methods:
- Geographic Information System (GIS) analysis.
- Statistical correlation techniques applied to fault and well data.
- Spatial analysis of 18 seismogenic faults and 1651 gas wells.
Main Results:
- A significant negative correlation was observed between productive gas wells and seismogenic faults.
- Unproductive wells were frequently located near or above seismogenic faults.
- Earthquake ruptures may cause significant gas loss over geological timescales.
Conclusions:
- Reservoirs located above smaller or aseismic faults are more likely to remain intact.
- Findings have implications for hydrocarbon exploration, fault behavior assessment, and underground energy storage in active tectonic regions.
- This research informs the public acceptance of carbon capture and storage (CCS) and other subsurface energy facilities.
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