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我们对一个中新世海相环境下沉积的页岩中厚砂岩夹层反射波进行了研究。测井数据表明,该砂岩层是含气饱和层。假设单层界面反射波为弹性各向同性介质中传播的平面波,且已由实际地震数据正确地恢复了振幅。在已知砂层上方层位的参数和标定常数情况下,我们试图反演岔气砂岩层AVO响应,该层纵波速度为α_2,横波速度为β_2,密度为ρ_2。在最远的偏移距上,实际反射波的入射角高达54度。
We studied the reflection of a thick sandstone interbedded in shale in a Miocene marine environment. Log data show that the sandstone is a gas-saturated layer. It is assumed that the monolayer interface reflection wave is a plane wave propagating in an elastic isotropic medium and the amplitude has been correctly recovered from the actual seismic data. In the case of the known parameters and calibration constants of the horizon above the sandstone, we attempt to invert the AVO response of the gas-fired sandstone bed with a longitudinal wave velocity of α_2, a shear wave velocity of β_2 and a density of ρ_2. At farthest offset, the angle of incidence of the actual reflected wave is up to 54 degrees.