Though marine oil provinces in the Middle Yangzi Region underwent serious deformation due to Yenshan movement

and as a whole

the hydrocarbon preservation condition of theregion is poor

some blocks favourable for oil and gas preservation could be found within theregions according to the analysis of their sealing condition and geochemical property of subsurface fluid. It is proposed that Mianyang and Dangyang blocks should be considered as thefirst favorable ones

Lixian block could be taken as secondary favourable one

andChangyang

Qianjiang blocks might be the third ones.