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International Examples

Only a few specific international examples of shallow, basin margin gas have definitely been identified. Documented accumulations of shallow biogenic gas (Leads: Figure 4) are a good place to start. Locations 1 (offshore Gulf of Mexico) and 2 (Cook Inlet, Alaska) are domestic, but could qualify as the margins of “one-sided” basins. The remaining numbered locations are international shallow biogenic gas accumulations, but may not all be strictly associated with specific basin margins.

The northern part of the West Siberian Basin (Location 3) has a huge gas accumulation that was originally thought to be biogenic. Subsequent studies (Littke and others, 1999) have suggested that there is also a thermogenic component and have demonstrated that a dynamic ground water flow system is important. Depths may be slightly greater than the basin margin accumulations in the US, but the northern part of the West Siberian Basin does qualify as an international example of basin margin gas.

Other important biogenic gas accumulations include:
4. Carpathian Foredeep, Poland
5. Appennine Foredeep, Italy
6. Quaidum Basin, China
7. brine gas, Japan

In an international perspective, shallow basin margin gas accumulations are particularly important energy resources for emerging and developing countries. In addition, these are important energy reserves for developed and industrialized countries that are attempting to diversify their energy base. Most occurrences are shallow and consequently relativel
y inexpensive to exploit. Widely-separated sweet spots can be used for pollution-free local consumption--such as distributed electrical generation in small power plants--until an infrastructure evolves.

Identification of basin margin shallow gas accumulations is therefore an important job. And, you can help by submitting examples, both international and domestic.



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