Tight sandstone permeability computing method based on nuclear magnetic resonance double-stop value

• Main Authors: GE XINMIN, FAN YIREN, LIU JIANYU, DENG SHAOGUI, XING DONGHUI
• Format: Patent
• Language: Chinese; English
• Published: 15.03.2017
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention discloses a tight sandstone permeability computing method based on a nuclear magnetic resonance double-stop value. T2 spectrums are inverted by measuring nuclear magnetic resonance decay curves of tight sandstone in completely water-containing and irreducible water conditions, the nuclear magnetic resonance T2 spectrums in the two conditions are contrasted, and nuclear magnetic resonance stop values of absolutely movable water and absolutely non-movable water are determined. On the basis, the relation among the content of absolutely movable water, the content of absolutely non-movable water and the permeability is analyzed, and a permeability model based on the nuclear magnetic resonance double-stop value is established. The method takes the contribution of different pore components for interstifial flows into full consideration, so that the permeability prediction accuracy of tight sandstone is improved. 本发明公开了种基于核磁共振双截止值的致密砂岩渗透率计算方法，通过测量致密砂岩在完全含水和束缚水状态下的核磁共振衰减曲线，将它们反演成T谱，对比两种状态下的核磁共振T谱，确定绝对可动水