14 specimens of representative immature source rocks of Oligocene from Jiyang depression in Shandong Province and 16 samples of peat soil and muck from Jilin

the East China Sea

the Bohai Bay

Weishan Lake and Futong River are studied through factor analyses

including R-type and Q-type analyses

and correlative analyses on the basis of 28 geochemical indexs

to identify the correlativity among samples and/or indexes. Results of this study show that the organic matters of Oligocene in Jiyang depression have the characteristic of near-shore fault-block bounded lacustrine basin with continental organic matters mixed with a little marine organic mat-ters.It has been proved that when this type of organic matters reaches sufficiently enough quantity in a matured environment

commercial oil and gas may be generated.