Well log peak shifts mean that the peak or valley of different well logs cannot be aligned. This is a common phenomenon in thin beds. To understand the cause of well log peak shifts, a discrete convolution model is proposed to simulate the response of well logs. At first, the responses of natural gamma ray logs, acoustic logs, neutron logs, density logs, and induction resistivity logs in single thick bed, single thin bed, and complex thin beds are simulated based on the proposed model. Simulation results show that well log peak shifts did not occur in single thick bed but did occur in single thin bed and complex thin beds. Well log peak shifts were especially obvious in complex thin beds. Well log peak shifts are mainly caused by a mismatch in the vertical resolutions of different well logs and rapid physical property changes of thin beds. Finally, five basic log peak shift patterns are proposed.
['Feng Wu', 'Zhu Wen', 'Xiaoyu Liang', 'Wei Yu', 'Jianhai Ma', 'Liqiang Sima']
Understanding Well Log Peak Shifts in Thin Beds