Origin of Extra LowPermeability and Controlling Factors of Chang 6 Reservoir in Zhuang 40 Area of Xifeng Oil Field

Key words: 
• Xifeng oilfield /
• Zhuang 40 area /
• origin of extra low permeability /
• controlling factors

Abstract: The origin of extra lowpermeability and controlling factors of Chan
g 6 reservoir in Zhuang 40 area of Xifeng oil field are studied synthetically through using the log information, testing and analytical information such as casting section, scanning electron microscope, Xdiffraction, grain size analysis and mercury penetration, et al. The results show that sedimentation and diagenesis have impacted on the origins of extra lowpermeability together, it is displayed that microfacies influenced properties greater, the properties in the medium of alluvial fan are better than that in the fringe. Meanwhile, grade in another factor caused the origin of extra low permeability, however, the component maturity have not showed obvious influence on the origin of extra low permeability, compaction and cementation decreased the porosity and permeability, denudation and diagenetic microfracture provided favorable conditions for the existence and movement of oil and gas.