盐城凹陷阜二段页岩油形成条件及富集规律研究

Formation condition and enrichment rule of shale oil in the second member of Funing Formation in Yancheng Sag

在岩心观察、分析测试、测录井资料分析的基础上,从页岩岩性、生油性、储集性和脆性等方面分析了盐城凹陷阜二段页岩油的形成条件;在重点油流井和显示井解剖的基础上,结合国内外已发现页岩油层特征,探讨了页岩油的富集规律。认为盐城凹陷阜二段页岩有机质丰度高,微裂缝及微孔隙发育,具有一定储集条件,脆性高,具备页岩油形成条件。页岩油显示平面上主要分布于南洋次凹深凹带,纵向上主要分布于页4、页3段。页岩油富集与有机质丰度、岩石相类型、成熟度、裂缝发育程度、异常压力等因素有关。评价认为南洋次凹深凹带页4段最为有利。

Based on core observation,analytical testing,and logging data analysis,the formation conditions of shale oil in the second member of Funing Formation in Yancheng Sag were analyzed from lithology,source nature,reservoir property,brittleness,and so on. Based on the analysis of typical well and oil show,combined with the discovered shale oil characteristic at home and abroad,the enrichment rule of shale oil was discussed. The shale in the second member of Funing Formation in Yancheng Sag has certain reservoir conditions of shale oil because of higher abundance of organic matter and developed micro-fracture and micropore,and certain formation conditions of shale oil due to higher brittleness. Oil shows of shale is mainly distributed in deep sag area in Nanyang sub-sag on the plane and in the fourth and third member of shale in vertcial direction. The enrichment of shale oil is related to abundance of organic matter,lithofacies type,grade of maturity,fracture development level,abnormal pressure,etc. The evaluation results indicated that the fourth member of shale in deep sag area in Nanyang sub-sag is the most beneficial.