摘要
结合盐间泥页岩油藏强超压和稠油的特点,以岩心描述、X射线衍射、扫描电镜、泥页岩孔隙度测试以及测井资料为手段,对东濮凹陷柳屯洼陷沙河街组三段上亚段(简称沙三上亚段)盐间泥页岩储层开展岩性、储集空间、物性以及储集类型研究,进而对盐间泥页岩储层进行综合分类评价。结果表明,盐间泥页岩储层岩性复杂,碎屑岩矿物、碳酸盐矿物和蒸发盐矿物组成了复杂盐韵律段;刚性矿物和有机碳含量高,有机质类型好,成熟度中偏低,强超压,构造缝和超压缝发育;有机质孔隙和与基质有关的孔隙较发育,为泥页岩主要储集空间;而裂缝与有机质孔隙结合提高了储层的渗透性。在此基础上,将沙三上亚段盐间泥页岩储层划分为4类。这一分类方案可为本区泥页岩油藏的进一步评价提供参考。
Based on superpressure and heavy-oil characteristics of inter-salt shale reservoirs,the paper studied lithology,accumulation space,porosity,permeability and a variety of shale reservoirs by means of core description,X-diffraction analysis,SEM,measurements of porosity in lab and well logging data,and then made a classification and evaluation for inter-salt shale reservoirs in the upper part of the third member of the Shahejie Formation（Es3）.The result showed that inter-salt shale reservoirs have a complex lithology because they are complex salt rhythms which are composed of clastic,carbonate and evaporitic rocks.Rigid minerals and total organic carbon are high,and organic matter type is good,with medium-to-low maturity.the formation pressure is high overpressure.Structural fractures and overpressure fractures are developed ubiquitously within shale reservoirs.Organic pores and matrix-related pores are relatively well developed,providing shale rocks with main storage space.Combination of organic pores and fractures increases permeability of shale reservoirs.On the basis of studies above,the upper Es3 inter-salt shale reservoirs can be divided into 4 types,providing an evaluation foundation for shale reservoirs in this area.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2013年第2期293-300,共8页
Acta Petrolei Sinica
关键词
泥页岩储层
有机质孔隙
分类评价
柳屯洼陷
盐间层段
shale reservoir
organic pore
classification and evaluation
Liutun sag
inter-salt interval
