Based on the previous discussion about geological setting and major controlling factors on the marine organic carbon-rich accumulation,this paper proposes that both high primary productivity(PP) and oceanic anoxic events(OAE) controlled the wide distribution of marine organic carbon-rich sediments in the mid-Cretaceous.

The Jurassic hydrocarbon source rocks on the north margin of Qaidam Basin could be divided into highstand marsh peat organic facies, forest marsh peat organic fades, shore-shallow lake organic facies and semideep-deep lake organic facies.

Directed by the theories such as Petroleum geology and Petroleum geochemistry,the source rocks of late cretaceous in Changling sag of southern Songliao basin are divided into organic facies A,organic facies B and organic facies B-C on the basis of the characteristics of organic petrology,sedimentology and organic geochemistry.

According to the organic petrology,sedimentology and organic geochemistry of source rocks,the sedimentary organic facies in this area can be divided into three types:hemideep-deep lacustrine organic,shore-swamp organic and high-stand swamp organic facies.

According to the characteristics of organic petrology, sedimentology and organic geochemistry, the source rocks of the Yanchang Formation in Zhenyuan - Jingchuan area in the south of Erdos basin are divided into three sedimentary organic facies including delta, coastal - shallow lake and semi - deep lake.

Being synthetically analyzed with methods of organic geochemistry, organic and/or sedimentary petrology, the Xishanyao formation is divided into four sedimentary organic facies, which are high moor, forest swamp, running water swamp, and open water organic facies, with the running water swamp and forest swamp being the main facies of hydrocarbon forming.