莺歌海盆地地层各向异性多波地震判别技术研究

MULTI-COMPONENT SEISMIC RECOGNITION TECHNIQUES OF THE STRATUM ANISOTROPY IN YINGGEHAI BASIN

充分利用中国在海上采集到的多波地震资料:PZ分量(P波)时间偏移剖面、X分量(P-SV波)时间偏移剖面和Y分量(P-SH波)时间偏移剖面,对莺歌海盆地3个构造(A构造、B构造、C构造)和D砂体的地下岩石介质的各向异性特征进行了研究,Y分量(P-SH波)、X分量(P-SV波)的旅行时间闭合差、准各向异性系数和泊松比结果表明A构造、B构造、C构造等存在不同程度的各向异性,且A构造的各向异性最强。实践证明,在海洋石油勘探中,多波地震资料用于地下岩石介质各向异性的判别是可行的。

In this article, we fully used the multi-component seismic data acquired on Chinese sea: PZ component (P wave) time migration profile,X component (P-SV wave) time migration profile and Y component (P-SH wave) time migration profile to study the anisotropy of subsurface rocks in three structures(structure A, structure B, structure C) and sand-body D of Yinggehai Basin. According to the closure dispersion of Y component(P-SH wave), the closure dispersion of X component (P-SV wave), quasi-anisotropy and Poisson ratio, we conclude that structure A, structure B and structure C have vary extent anisotropy,while in structure A, there has the mostly high anisotropy. The study proved that the multi-component seismic data is feasible for distinguishing the anisotropy of subsurface rocks.