摘要
探究南梁西区长8储层的特征及主控因素,为区内石油勘探及开发提供参考。通过对铸体薄片、扫描电镜、岩样压汞等测试结果以及区内测井、录井、试油等资料的收集、整理及分析,展开对鄂尔多斯盆地南梁西区长8储层特征及影响因素的研究。研究区长8储层主要含有岩屑长石砂岩和长石岩屑砂岩。储集空间以粒间孔为主,其次为溶孔及微孔。储层类型为中排驱压力-中喉型,从孔渗特征判断为低孔低渗,呈现强非均质性。三角洲前缘水下分流河道是形成储层的主要相带,储层特征受控于沉积成岩作用。研究区强烈的压实压溶作用及胶结作用是储层孔隙度与渗透率低的主要原因;早成岩期A阶段形成的绿泥石膜对储层孔隙发育有利;研究区长8经历的两期溶蚀,是改善储层的重要建设作用。
To study the characteristics and control factors of Chang 8 Reservoir of Western Nanliang area, and direct scien- tific and effective exploitation. Through collection, arrangement and analysis of cast slices, scanning electron microscope ima- ges, mercury injection test, well logging and oil testing, the article researches the physical property and its controls of Chang 8 Formation of Yanchang in Western Nanliang Area, Ordos Basin. Chang 8 Formation mainly contair^s of lithic - arkose and feldsparthic litharenite. Irregular pores provide major reservoir space and additional space is provided by dissolution pores and micro pores. The reservoir with medium displacement pressure and medium throat is low porosity, low permeability and hetero- geneity. Subaqueous distributary channel deposits of delta front form most part of reservoirs. The characteristics of reservoir are controlled by diagenesis. The porosity was reduced by compaction, pressure solution and cementation. Chlorite membrane which forme during stage A of early diagenesis and the two stages of dissolution in Chang 8 period are advantages for reservoir pore evolution.
出处
《地下水》
2013年第1期134-137,共4页
Ground water
基金
国家重点基础研究发展计划(973计划)项目(2003CB214602)
陕西省教育厅科学研究计划项目(2010JK919)
关键词
储层特征
成岩作用
长8储层
南梁西区
鄂尔多斯盆地
Reservoir Characteristics
Diagenesis
Chang 8 Formation
Western Nanliang Area
Ordos basin
