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鄂尔多斯盆地上三迭系延长统长_(6-8)为一套低渗油层,厚度大,分布广,但产油量很低。为采取相应的措施提高油井产量,开辟了一个试验区,进行了油层研究工作:用压汞法进行了孔隙结构研究;通过薄片、红外光谱、差热和X衍射等分析进行了粘土矿物鉴定;对岩心作了微细裂缝观察和润湿性试验;用图像分析仪对一些薄片进行了孔隙数量及面积的测定;通过电镜扫描对比了样品在不同液体注入前后孔隙结构的变化。通过这些工作揭示了长_(6-8)低渗油层的孔隙结构特征,为进行压裂增产试验提供了依据。
Upper Triassic Yanchangchangchang_ (6-8) in Ordos Basin is a set of low permeability reservoirs with large thickness and wide distribution, but low oil production. In order to take corresponding measures to improve the oil production, a pilot area was opened to study the oil layer: the pore structure was studied by mercury intrusion method; the clay mineral was identified by the analysis of flake, infrared spectrum, differential thermal and X-ray diffraction; The cores were observed for microscopic cracks and wettability. The number and area of pores in some sheets were measured by image analyzer. The changes of pore structure before and after the different liquids were compared by scanning electron microscope. Through these efforts, the pore structure characteristics of the oil layer with long _ (6-8) permeability were revealed, which provided a basis for the stimulation test of fracturing stimulation.