碳中和背景下的CO_(2)地质封堵能力评价参数研究

Study on elvaluation parameters of carbon dioxide geological plugging ability under carbon neutral background

如何达成"碳达峰""碳中和"目标,是构建"绿色、低碳、可持续"高质量发展新格局的重要支撑。本文综合利用铸体薄片和扫描电镜等实验手段对封堵层的岩性、物性、孔隙特征、突破压力等参数进行分析,最后从微观和宏观两方面对封堵能力进行了评价。研究表明:研究区长4+5油层组主要以含泥岩屑长石粉砂岩和含泥极细粒岩屑长石砂岩为主,黏土矿物含量高;孔渗物性差、排驱压力高、孔喉半径比大,属于中高排驱压力-微喉道型;突破压力介于7.92~12.5 MPa,突破压力高且长;封堵层厚度介于20~30 m,综上所述表明研究区封堵层具有很好的封堵能力,能够实现有效的封堵。通过此研究,对于鄂尔多斯盆地CO_(2)的地质封存选址有一定的借鉴意义。

How to achieve the"carbon peak"and"carbon neutral"goals is an important support for building a new pattern of"green,low-carbon,and sustainable"high-quality development.In this article,the lithology,physical properties,pore characteristics,breakthrough pressure and other parameters of the plugging layer are analyzed by means of casting thin section and scanning electron microscope.At last,the sealing ability is evaluated from macroscopic and microscopic aspects.Studies have shown that the Chang 4+5 reservoir in the study area is mainly composed of argillaceous feldspar siltstone and argillaceous very fine grained lithic feldspar sandstone.High content of clay minerals,poor porosity and permeability,high displacement pressure,large pore-throat radius ratio.It belongs to medium and high displacement pressure-microchannel model.Breakout pressures range from 7.92~12.5 MPa.Breakout pressure is high and long.The sealing thickness is about 20~30 meters.In conclusion,it is in dicated that the plugging layer in the study area has good plugging ability.Effective plugging can be achieved.Through this study,it is of certain reference significance to the geological storage site of carbon dioxide in Ordos Basin.