Tight sandstone density logging curve correction method based on LLD and GR joint scale

• Main Authors: WANG LU, ZHAO LAN, ZHAO RONGHUA, DING FENGJUAN, CAO TONGSHENG, ZHANG WEI, JIA HUICHONG
• Format: Patent
• Language: Chinese; English
• Published: 18.02.2022
• Subjects: DETECTING MASSES OR OBJECTS; GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; MEASURING; PHYSICS; TESTING

The invention belongs to the technical field of petroleum and natural gas exploration and development, and particularly relates to a tight sandstone density logging curve correction method based on LLD and GR joint calibration. The method comprises the steps: firstly determining the depth of a sandstone section; then determining a non-expanded section and an expanding section of the sandstone section; secondly, carrying out regression analysis on actually-measured data of the non-expanded section, enabling the actually-measured data to comprise actually-measured density data and actually-measured deep lateral resistivity and actually-measured natural gamma values of corresponding depths, obtaining a non-expanded section relation model, and taking the non-expanded section relation model as an expanded section relation model; and finally, obtaining a corrected density logging curve of the expanded section according to the deep lateral resistivity logging curve and the natural gamma logging curve of the expanded