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鄂尔多斯盆地陇东地区长7段广泛发育致密砂岩储层,致密油资源丰富。与常规储层的研究方法不同,需要采用针对性的实验技术与分析方法对其开展研究。本文采用TRA、核磁共振实验,结合岩心观察、薄片鉴定及成像测井等资料,对陇东地区长7段致密砂岩储层进行了精细表征。研究结果表明:长7段致密储层破坏性成岩作用较强,有效孔隙度、束缚烃的含量随深度的增加而减小;根据离心实验,标定长7段致密储层可动流体孔喉下限约为0.1μm,实验结果与高压压汞数据相吻合;长7段可动流体饱和度较高,可动流体饱和度与孔隙度、渗透率相关性较差,微裂缝的存在改善了油气在长7致密储层中的运移和聚集的能力。
The tight sandstone reservoirs are widely developed in the Chang 7 Member of the Longdong area in the Ordos Basin, and the tight oil resources are abundant. Different from the research methods of conventional reservoirs, we need to carry out the research by using specific experimental techniques and analytical methods. In this paper, the TRA and NMR experiments were used to analyze the tight sandstone reservoirs in the Chang-7 Member of the Longdong area by using the data of core observation, slice identification and imaging logging. The results show that the destructive diagenesis of the tight reservoirs in Chang 7 Member is strong, and the content of effective porosity and bound hydrocarbon decreases with the increase of depth. According to the centrifugal test, the lower limit of pore throats About 0.1μm, the experimental results are in good agreement with the data of high pressure mercury intrusion. The moving fluid in Chang 7 section has higher saturation, and the correlation between movable fluid saturation and porosity and permeability is poor. Ability to migrate and accumulate in long, tight 7 reservoirs.