南黄海崂山隆起地震采集方法

ON SEISMIC ACQUISITION METHODS ON THE LAOSHAN UPLIFT OF THE SOUTH YELLOW SEA

南黄海盆地崂山隆起经历了多期构造运动,中生界地层几乎剥蚀殆尽,使得新生界底界存在高速屏蔽层,地震波能量难以下传,同时由于下伏中—古生界主要以碎屑岩、碳酸盐岩为主,反射系数小,导致南黄海崂山隆起深部中—古生界地震成像效果较差,信噪比低。为了提高地震波能量下传,改善深部地震成像效果,近几年在南黄海崂山隆起开展了较大气枪容量震源、长电缆地震采集方法。通过系统分析近几年崂山隆起地震采集参数,针对研究区中—古生界地质条件特征,结合实际地震资料效果进行论证分析,得出了适合南黄海崂山隆起的地震采集参数建议。

The Mesozoic is almost completely eroded on the Laoshan Uplift of the South Yellow Sea,and there is a high-velocity shield below the Cenozoic.Therefore,the seismic wave energy is difficult to penetrate downwards.The underlying Paleozoic strata consist mainly of carbonate and clastic rocks,which are petrophysically little different,and thus the reflection coefficient is small.As the results,seismic images of the deeper Paleozoic strata are bad in quality and the signal to noise ratio is low.In order to improve the penetration of seismic wave energy and enhance the seismic imaging of the Paleozoic strata,seismic acquisition using a large airgun source and long cable have been carried out in the South Yellow Sea recently.In this paper,seismic acquisition parameters suitable for oil and gas survey of the Paleozoic strata at the Laoshan uplift are recommended upon the seismic acquisition parameters collected from recent data.