Conventional hydrocarbon indication ( HCI) technique is based on the variations of amplitude, frequency and velocity of seismic wave. It aims at locating the abnormal area in a seismic section where velocity and frequency drop, but amplitude enhances. 常规HCI油气检测技术是建立在振幅、频率、速度三类参数基础上的,其目的是在地震剖面上寻找速度变低、振幅增强、频率变低的部位。