摘要
Tight oil in Yanchang formation, late Triassic, formed in fairly deep lake to deep lake sedimentary facies, is a kind of tight sandstone oil. With typical cases of that in Chang7 oil-bearing layer and Chang6 oil-bearing layer （in central part of the basin）, the tight oil is rich in resources.
Tight oil in Yanchang formation, late Triassic, formed in fairly deep lake to deep lake sedimentary facies, is a kind of tight sandstone oil. With typical cases of that in Chang7 oil-bearing layer and Chang6 oil-bearing layer （in central part of the basin）, the tight oil is rich in resources.
