Abstract
The PreCaspian (North Caspian) Basin is located on the SE margin of the Russian Platform and extends as far south as the north coast of the intra-continental Caspian Sea. Regional surface elevations here are as much as 24 m below sea-level. The basin is one of the World's deepest, with basin-fill sediments exceeding 20 km in thickness. The Proterozoic section the pre-salt Palaeozoic section and the Upper Permian (salt-bearing) interval are all about 5-km thick although as a result of salt movements the salt-bearing sequence may be thicker. The basin has a roughly oval outline and is 900-km wide 600-km in length and covers around 500,000 sq. km. It is divided into the Central and SE Sub-basins by the approximately east-west trending Astrakhan-Aktyubinsk system of basement highs. A series of massive carbonate build-ups rim the basin margins.
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