Method for estimating organic porosity of shale with pore diameter of 0.3-10nm

• Main Authors: HE CHENCHENG, HE SHENG
• Format: Patent
• Language: Chinese; English
• Published: 08.05.2020
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a method for estimating the organic porosity of shale with the pore diameter of 0.3-10nm. The method comprises the following steps: calculating the pore volume with the pore diameter of 0.3-10nm in a shale sample by utilizing a density function theory DFT model through a shale sample carbon dioxide and nitrogen adsorption test; establishing a linear positive correlation relationship between the pore volume of the shale sample with the pore diameter of 0.3-10nm and a TOC content; and estimating an organic pore volume of 0.3-10 nm and the ratio of the organic pore volumeto the total pore volume and estimating the shale organic porosity with the shale pore diameter ranging from 0.3 nm to 10 nm by combining the shale total porosity. The method is clear in thought and reliable in technology, the physical significance of related parameters is definite, and the estimation method and a calculation formula are convenient to apply. 本发明公开了一种孔径介于0.3-10nm的页岩有机孔隙度估算方法，包括以下步骤：通过页岩样品二氧化碳和氮气吸附测试，利用密度函数