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‐slat Palaeozoic section, and the Upper Permian (slat‐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 is 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.This paper considers the sturcture and hydorcarbons potential of the pre‐salt (Palaeozoic) sedimentary section, whose regional prospectivity has been confirmed by the discovery of a series of “giant” oil, gas and condensate fields, including Tengiz, Karachaganak and Astrakhan. Hydrocarbons in these fields are sourced and reservoired in massive organicrich carbonates of Palaeozoic age.
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