Abstract:

On the analysis of tectonic depositional setting,the Carboniferous salt bearing set in North Tarim Basin mainly formed in the hot and dry evaporating lagoon environment of beach intertidal zone controlled by sea level changes with the thickness of 80～221 m.Under the influence of regional tectogenesis,the salt body underwent three times of plastic fluxion in geological history.The first time was in the late stage of Early Permian,the salt flowed 2～2.8 km southwards;the second time was in Late Triassic Early Jurassic,the salt flowed 1～2.8 km southwards again;the third time was in the end of Tertiary,the salt turned to flow northwards for 0.5～1.2 km.The salt flow resulted in several kinds of structural traps mainly including salt ridge anticline,salt dome and salt edge syncline.It has been proved by facts that the salt ridges are major oil and gas bearing structures while the rest two kinds should also be taken into considerable account.

Key words: salt body, plastic fluxion, trap, Carboniferous, Tarim