Abstract:

In 1984,the Shacan-2 well,positioned in Tarim basin,flowed for the first time with large amount of oil and gas,marking the discovery of giant Tahe oilfield.It was not only the first significant breakthrough in exploration of the Paleozoic strata,but also an important milestone in Chinese oil/gas exploration history.Since then,several other Paleozoic oilfields were discovered and the theory of hydrocarbon reservoiring in the strata in China was established.It is a period characterized by independent innovations in exploration of the Paleozoic marine strata.Based on a systematic summaries and review of the time,the article concludes that more large oil/gas discoveries depend on many factors,among which deeper basic researches are the precondition,innovations and creativity are the key,technology advancements are the necessary conditions,and continuous explorations and practices are the guarantee.

Key words: Paleozoic, marine, large oil and gas field, Tarim Basin