大安北地区扶余油层储层致密化原因

The Causes of Densification in Northern Da'an Area of Fuyu Reservoir

大安北地区扶余油层为典型的致密砂岩储层,为深入了解其致密化的原因,更好地指导油田的勘探和开发,通过对大量岩心、薄片、扫描电镜、X衍射及分析化验资料的剖析,讨论了致密化储层的主要控制因素。结果表明,沉积作用和成岩作用与储层致密化的关系较为密切。沉积微相在宏观上控制着储层的分布,碎屑颗粒中长石、岩屑等不稳定组分及杂基含量较高是储层致密化的主要原因;而强烈的压实作用和胶结作用也在一定程度上导致储层的致密化;区内溶蚀作用对储层的改造有限。

Fuyu reservoir in the northern Da'an Area was a typical tight sandstone reservoir. To better understand the reason of densification and guide the exploration and development of the oilfield,through a large number of data of cores,thin sections,scanning electron microscopy,X-diffraction analysis,the main control factors of the dense reservoirs were studied. The results show that the deposition and diagenesis are closely related with reservoir densification. The distribution of reservoir is macroscopically controlled by sedimentary microfacies,detrital feldspar,debris and higher content of matrix are main reason of densification of the reservoir. Serious compaction and cementation induce the densification of the reservoir to some extent,and the dissolution is limited to the reservoir reconstruction.