The Study Of Geochemesty Correction Between The Source Rocks Of Kongdian Formation In Donying Depression And The One In Weibei Depression And The Analasis Of Oil Origination

Kongdian Formation is an important oil accumulation layer in which the source rocks are mainly distributed in Changdong-nanpi Sag of Huanghua depression and Weibei area of Changwei Depression. Recently, amount of oil was discovered in Dongying Depression gradually. But the cognition of Source rocks and crud oil has not been systemized and the source of oil has a degree of bifurcation. The dissertation was carried out the further study.It is founded that the low organic carbon of grey mud rocks is mainly caused by the high maturity and the macerals is mainly consisted of saprogenite and vitrinite, meanwhile Weipei basin has a degree of similarity only displays some higher chitinite in difference . According to the kerogen style, element composition, pyrogenation parameter, extract group composition and saturation chromatogram, we can find the style of organic is mainly consisted of II₂ and II₁.The maturity are rather high, while compared with the Dongying Depression, the crude oil of Weibei Depression has an obvious superiority of pristine and a rather low ratio of γ -waxane/C3o hopanes.Through the oil correction it is founded that the oil of Kongdian Formation in Dongying Depression may be originated either from source rocks of Kongdian or from that of Member Four of Shahejie Formation. While all of crude oil in Weibei Depression are from Source rocks of member Two segment of Kondian Formation, that is to say, the oil belongs to the near-headstream reservoir which don't move long way vertically and transversely.Through the study of hydrocarbon-generation evolvement applying with the technology of basin modeling, it is founded that the time of generate and exclude hydrocarbon is between the Member Four of Shahejie Formation sediment telophase and Dongying sediment telophase.The sedimentary environment and the source of organic matter in Dongying Depression are similar to Weibei Depression. The source rocks in both district has a degree potential to generate hydrocarbon so that can provide reservoir with enough oil.