[Society of Exploration Geophysicists and Society of Petroleum Geophysicists SPG/SEG 2016 International Geophysical Conference, Beijing, China, 20-22 April 2016 - Beijing, China (20 April to 22 April)] SPG/SEG 2016 International Geophysical Conference, Beijing, China, 20-22 April 2016 - An application of stratal slice technique in channel sand body reservoir description in dense well pattern zone–taking North III West area of Saertu oil field as an example