Northside: Introduction to Shallow Geo-hazards in Deep Water, and Drilling Hazards Associated with Exploration Around Salt

Speaker: John Dribus
Speaker John Dribus
John Dribus is the Global Geosciences Advisor for Schlumberger Oil Field Services.  He is a Reservoir Geologist with over 39 years’ experience, and has worked all aspects of petroleum exploration, exploitation,  and production geology. He worked five years as a uranium field geologist, and 20 years for Mobil Oil as a petroleum ...

John Dribus is the Global Geosciences Advisor for Schlumberger Oil Field Services.  He is a Reservoir Geologist with over 39 years’ experience, and has worked all aspects of petroleum exploration, exploitation, 


and production geology. He worked five years as a uranium field geologist, and 20 years for Mobil Oil as a petroleum geologist, including 14 years working the deep water Gulf of Mexico (GoM). He worked the past 14 years for Schlumberger as Northern GoM Operations Manager for Data and Consulting Services, and as Global Geologic Advisor working deep water basins in the GoM, Greenland, the Black Sea, the Red Sea, Ghana (Jubilee), Gabon, and the pre-salt of Angola and Brazil.


 


His expertise is in regional exploration geoscience and risk analysis, petroleum systems analysis, global deep water analogs and exploring in salt basins. He is the former Chairman of the Advisory Broad of the American Petroleum Institute (API) Delta Chapter, serves on the Imperial Barrel Award Committee of the AAPG, and is a member of the AAPG (30 years) and SPE, New Orleans Geological Society NOGS, Houston Geological Society HGS, and the European Association of Geoscientists and Engineers EAGE. In 2013 he was awarded the regional Reservoir Description and Dynamics Award from the Society of Petroleum Engineers International. 

Full Description

Even though the Macondo incident in the Gulf of Mexico did not directly involve shallow drilling hazards, since Macondo, the oil and gas industry has focused increased attention on all possible hazards involved in deep water drilling. The new focus has followed a three-step approach to address various drilling hazards that may be encountered in deep water: Identification, Prevention, and Mitigation.

 

This presentation focuses on understanding the geologic origin of various hazards in deep water by reviewing the geologic origin, physical characteristics, and behaviors of the three main deep water geo-hazard types.

  • Man-made surface hazards including linear geometry and single site geometry hazards.
  • Sea-floor geologic hazards including pockmarks, mud volcanoes, unstable sea floor, unstable slopes, and mass sediment movements.
  • Sub-surface geologic hazards including shallow water or gas flows, reactivated faults to surface, gas chimneys, disassociating gas hydrates, and anomalous pore pressure effects.

 

In the past few years exploration below major salt canopies (allochthonous salt) and layered evaporites (autochthonous salt)  has discovered  significant accumulations of  hydrocarbons in the GoM and along the Atlantic basin margin, but has also identified several types of drilling hazards that can significantly increase the risk and cost of exploration in salt basins. This presentation also examines potential drilling hazards often associated with massive salt and layered evaporates including:  

  • Entering salt (cap rock), 
  • Drilling within the salt (sutures, inclusions, layered evaporites of variable density and  creep rate),
  • Exiting the salt (rubble zones, feeders and welds), and
  • Drilling immediately below the salt (mobile bitumen and diagenetic alteration).

 

Examples are presented from the Gulf of Mexico, Brazil, Angola, and other Atlantic margin basins. 

Organizer Matthew Strom

Email: matthew_strom@swn.com


 


Office: (281) 618-7848

When?

Tue, May. 13, 2014
11:30 a.m. - 1 p.m. America/Chicago

How Much?

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Where?

Greenspoint Club
16925 Northchase Dr.
Houston, Texas 77060
United States

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