春光探区白垩系油气成藏条件及主控因素

春光探区为源外成藏区,油源为东部昌吉凹陷和南部四棵树凹陷的二叠系和侏罗系,白垩系油藏主要为地层不整合油藏,包括重质稠油和中质油油藏。通过油源条件研究,确定了白垩系油藏的油源特征;通过输导体系研究,确定了不整合和断层组成的白垩系输导格架;通过沉积储层特征研究,确定了三角洲水下分流河道和滩坝砂体为有利储集相带;通过成藏期次研究,确定了白垩系油藏两期成藏,后期被断层破坏稠化的成藏期次。综合研究认为,高效的输导体系、各砂组地层尖灭线展布范围和优质储层是白垩系地层油气藏成藏的主控因素。

Cretaceous hydrocarbon accumulation conditions and main controlling factors analysis of Chunguang exploration area

Chunguang exploration area is a hydrocarbon accumulation area outside the oil source area,and the oil source area is in the east of Changji sag and in the south of Sikeshu sag in Permian and Jurassic.Cretaceous reservoirs are mainly of stratigraphic unconformity reservoirs,including heavy and intermediate of heavy oil reservoir.Through the study on oil source conditions,the oil source characteristics of the cretaceous reservoirs have been determined.Through conducting system research,the unconformity and fault of cretaceous petroleum have been determined.Through the research of sedimentary reservoir characteristics,the delta and beach bar underwater distributary channel sand body have been determined to be the favorable reservoir facies belt.Through hydrocarbon accumulation stage research,two hydrocarbon accumulation phases have been determined.Comprehensive research believes that the efficient transportation systems,the stratigraphic pinchout sand group line distribution range and high quality reservoirs are main controlling factors of cretaceous stratigraphic reservoir accumulation.