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.