Oil and Gas Migration
As with other reservoirs in the North Caspian (Pricaspian) Basin, it is thought that the Karachaganak reservoir was filled over multiple stages, the first of which began during late Paleozoic time with the formation of oil pools. As the basin began to subside, gas was generated and migrated to the traps. The gassiness of the reservoirs is determined by their location in the basin. Northern reservoirs tend to be wet; the southwest part of the basin is more gas prone than are the east and southeast.
Read more about this topic: Karachaganak Field
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