Why is scientific work in geohazard important - where does Geohazard fit in to oil business ?. Presented by James M. Strout. Assessment - Prevention - Mitigation. GEOHAZARDS, WHAT ARE THEY?
Why is scientific work in geohazard important - where does Geohazard fit in to oil business?
Presented by James M. Strout
Assessment - Prevention - Mitigation
GEOHAZARDS, WHAT ARE THEY? Geohazard fit in to oil business
“Events caused by geological conditions or processes, which represent serious threats for human lives, property or the natural environment”
INTERNATIONAL CENTRE FOR GEOHAZARDS Geohazard fit in to oil businessAssessment, prevention, mitigation and management
Develop knowledge that can help save lives and reduce material and environmental damage.
To be, within 5 to 8 years, the world authority and the premier research group on geo-related natural hazards, with special emphasis on slide hazards, both on land and offshore.
Wave generation Geohazard fit in to oil business
Gas hydrates or free gas
The Ormen lange field illustrates the importance of a geohazard study
The Storegga Slide (8200 ybp) Geohazard fit in to oil business
Field development was contingent on the results of the geohazards study. It was necessary to:
- understand the Storegga slide
- survey, sample, test and monitor to characterise site
- develop failure mechanisms and models
- evaluate the present day stability conditions
These studies resulted in the conclusion that the present day slopes were stable, and the site was safe for development.
Headwall 300 km
Run-out 800 km
Volume 5.600 km3
Area 34.000 km2
h(t) Geohazard fit in to oil business
Stress/pressure: p, s, u, s’Defining critical geo-processes1D Basin model for Pressure-Temperature time history during geological time
p=hydr. water pressure
s=vertical soil stress
s’=eff. soil stress
BGHSZ at LGM sea level at -130m m Geohazard fit in to oil business
Potential zone of GH melting
BGHZ after intrusion
of warm atlantic surface water
BGHSZ after sea level riseContributing processes/interactionGas hydrate melting caused by climate change after deglaciation
Geothermal gradient 50C/km
0.05g Geohazard fit in to oil business
Depth belom mudline, m
Depth belom mudline, m
Max. pore pressure ratio after event, %
Max. displacement, cmTriggering mechanisms Earthquake analysis
Evaluate consequences Geohazard fit in to oil businessTsunami modelling and prediction