Deadlines
02 Oct

ACE 2015 Call for Papers Expires in 1 day

Bulletin Article

7968
 

Umiat field in northern Alaska is a shallow, light-oil accumulation with an estimated original oil in place of more than 1.5 billion bbl and 99 bcf associated gas. The field, discovered in 1946, was never considered viable because it is shallow, in permafrost, and far from any infrastructure. Modern drilling and production techniques now make Umiat a more attractive target if the behavior of a rock, ice, and light oil system at low pressure can be understood and simulated.

The Umiat reservoir consists of shoreface and deltaic sandstones of the Cretaceous Nanushuk Formation deformed by a thrust-related anticline. Depositional environment imparts a strong vertical and horizontal permeability anisotropy to the reservoir that may be further complicated by diagenesis and open natural fractures.

Experimental and theoretical studies indicate that there is a significant reduction in the relative permeability of oil in the presence of ice, with a maximum reduction when connate water is fresh and less reduction when water is saline. A representative Umiat oil sample was reconstituted by comparing the composition of a severely weathered Umiat fluid to a theoretical Umiat fluid composition derived using the Pedersen method. This sample was then used to determine fluid properties at reservoir conditions such as bubble point pressure, viscosity, and density.

These geologic and engineering data were integrated into a simulation model that indicate recoveries of 12%–15% can be achieved over a 50-yr production period using cold gas injection from five well pads with a wagon-wheel configuration of multilateral wells.

Explorer Article

11791
 
Explorer Article

The options for female geologists might not have matched those of their male counterparts in the 1930s and ‘40s, but for some women – they were opportunities nonetheless – and they deserved chasing. Helen Laura Foster, an AAPG member who is now 94, took full advantage of those opportunities.

9502
 
Explorer Article

Mystery of the deep: No one knows for sure what quantity of gas hydrates awaits discovery deep in the earth, but projections are auspicious.

8583
 
Explorer Article

On March 27, 1964, Mike Mitchell and others were in the field working on a research project with professor Ruth Schmidt from the geology department at ACC when they experienced the Great Alaskan Earthquake, the most powerful earthquake in recorded U.S. history.

8580
 
Explorer Article

Ruth Schmidt, one of the first 100 women members of AAPG, is celebrated for her brilliant and adventurous career geologic career.

Explorer Division Column EMD

3800
 

Every six months, chairs of the Energy Minerals Division committees convene and report on developments in the areas they cover. In this column, we highlight important observations from these recent reports.

Explorer Emphasis

12414
 
Explorer Emphasis Article

When geologist and AAPG member Rocky Reifenstuhl burst onto the scene in Fairbanks in the late 1970s – working for the Alaska Division of Geological and Geophysical Surveys (ADGGS) for 27 years – his passion for extreme sports and adventure naturally spilled over into his profession.

12403
 
Explorer Emphasis Article

The exploration expeditions in Alaska beginning in the late 1800s trump most other places in the world: The nuances of geology and geophysics required to find oil and gas in America’s last frontier tell the technical side of the journey, but mix in a history of Native Americans and Russians leading explorers to oil seeps, Hollywood investors, sled dog exploration teams, and rigs disassembled and transported by air for the first time – and science inevitably becomes a bit of lore.

8053
 
Explorer Emphasis Article

A multi-client seismic database maps prospects and pitfalls in the largely uncharted Arctic North Slope.

Explorer Historical Highlight

10218
 

The history of oil development in Alaska is often presented as a heroic tale, but long before the 1968 discovery of the Prudhoe Bay field (16 billion barrels and counting), the industry experience was marked by a great deal of frustration and failure.

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