摘要
为合理预测油田的优质储层,以鄂尔多斯盆地镇北地区长81段储层为例,采用薄片鉴定、扫描电镜等方法,研究储层基本特征和成岩作用,分析储层低渗透的成因以及优质储层的发育机理。结果表明,长81段储层属于辫状河三角洲前缘亚相沉积,主要岩石类型为岩屑质长石砂岩,其次为长石质岩屑砂岩,两者成熟度相对较小,且含有大量的塑性颗粒,导致储层抗压实性较差。储层在成岩阶段形成较强的胶结作用,承受较强的机械压实作用,导致储层物性变差,形成低孔特低孔-特低渗透超低渗透储层。绿泥石膜-粒间孔成岩相、弱压实成岩相等是研究区优质储层发育的主要成岩相带。该研究为油田低渗透油气藏的开发提供了理论依据。
This paper is motivated by a reasonable prediction of the high quality reservoirs occurring in oil fields.The study building on Chang 8 1member in Zhenbei area of Ordos basin involves investigating the basic characteristics and diagenesis of the reservoir using thin section examination and scanning election microscopy and thereby analyzing the formation of low permeability reservoirs and development mechanism of the high quality reservoirs.The results show that Chang 8 1member reservoirs are characterized by braided river delta front subfacies deposits and consist mainly of such rocks as lithic arkose and feldspathic litharenite,both of which exhibit a lower compositional maturity and a higher content of plastic particles,with a resultant poor reservoir compaction;the stronger cementation occurring in diagenesis stage and a stronger mechanical compaction tend to produce poor reservoir physical properties,hence the formation of reservoirs with low porosity,ultra-low porosity,and ultra-low permeability;chlorite film-intergranular pore diagenetic facies and weak compaction diagenetic facies constitute the main diagenetic facies zones for the development of high-quality reservoirs in the study area.The study could serve as a theoretical basis for the development of low permeability reservoirs.
作者
徐守余
王子松
Xu Shouyu;Wang Zisong(School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China)
出处
《黑龙江科技大学学报》
CAS
2018年第6期619-624,共6页
Journal of Heilongjiang University of Science And Technology
基金
国家科技重大专项(2017ZX05009001)
关键词
低渗透储层
优质储层
成因机制
发育机理
low permeability reservoirs
high quality reservoirs
genetic mechanism
development mechanism
