Characteristics and Main Controlling Factors for Lithologic Reservoirs of the Fuyu Oil Layer in the Northern Honggang, Songliao Basin

Key words: 
• lithologic reservoirs /
• monosandbody /
• Fuyu oil layer /
• Songliao Basin /
• oilcontrolling unit

Abstract: Through study on types and characteristics of lithologic reservoirs of Fuyu oil layer in the northern Honggang, Songliao Basin, four main controlling factors for lithologic reservoirs are: (1) Fault is the most important predominant transporting pathway of overpressure fluid. (2) Overpressure is power of petroleum migrating down. (3) Longterm inherited noselike structure is predominant direction of petroleum lateral migration. (4) Genetic monosandbody traps are minim oilcontrolling units and oilaccumulating units which are controlled by vertical layer and planar sedimentary microfacies. Spatially complicated superposition of vertical multilayer and planar multibranch monosandbody traps and mistraps is essential reason of the complicated distribution of oil and water. It provides a vital foundation for prediction of lithologic traps, analysis of lithologic reservoir forming and study on complicated distribution of oil and water. The model is of great significance to complex exploration and development of lithologic reservoirs.