论文部分内容阅读
通过对650块砂岩样品铸体薄片偏光显微镜下观察,辅以粘土矿物X-射线衍射分析,电子探针,阴极发光显微照相,电子扫描显微镜,显微图象分析和压汞分析等手段,详细地研究了大庆长垣萨尔图油田北-断东地区葡Ⅰ油层组砂岩储层化学成岩作用与孔隙结构的关系,该区葡Ⅰ油层组砂岩属于湖泊浅水三角洲沉积体系中水下分流平原沉积,碎屑成分复杂,成熟度低,虽然现今埋深为950～1200m,但所经历的化学成岩作用对孔隙结构的改造效果却十分显著,其中体积分数1.1的亮晶方解石胶结作用可以使砂岩中粗喉(10～60"m)下降12.9％,渗透率降低1～2个数量级(/Jm~2),化学溶解作用是提高本区砂岩孔,渗的主要原因之一。它可以使砂岩的粗喉达26.3％,渗透率大于8flm~2。
Through the microscopic observation of the castings of 650 sandstone samples and the analysis of X-ray diffraction of clay minerals, electron probe, cathodoluminescence microphotograph, electron scanning microscope, microscopic image analysis and mercury intrusion porosimetry, The relationship between chemical diagenesis and pore structure of sandstone reservoir in Pu Ⅰ oil layer of Bei - Duandong area, Sa’ertu Oilfield, Daqingyuan, Daqing, is studied in detail. The sandstone of PuⅠ reservoir belongs to the subaqueous distributary plain in shallow lacustrine sedimentary system Although the sedimentary and debris composition is complex and the maturity is low, the depth of 950 ~ 1200m nowadays is greatly affected by the chemical diagenesis. The volume fraction 1.1 of the bright calcite cementation can make sandstone In the middle and low throat (10-60 m), the permeability decreased by 12.9% and the permeability decreased by one or two orders of magnitude (/ Jm ~ 2). The chemical dissolution was one of the main reasons for the increase of sandstone pores and infiltration in this area. Sandstone coarse throat up to 26.3%, permeability greater than 8flm ~ 2.