小容量六源混合采集技术在巴伦支海的应用及对南黄海海相地震勘探的启示

Application of six source marine acquisition with small capacity in the Barents Sea and its enlightenment to marine oil and gas seismic exploration in the South Yellow Sea

巴伦支海和南黄海具有大致相同的地震地质条件,由于浅部发育的区域性强反射界面,造成可用地震入射孔径窄,地震照明密度不足,海相油气目标层成像品质下降.在巴伦支海的油气地震勘探中,为有效提高地震照明密度,同时保持较高的采集作业效率及满足对海洋生物无伤害的环保要求,采用了一种新的小容量六源海洋混合采集方法,实现了更密集和更均匀的激发点分布,成倍地提高了地震照明密度,改善了强反射界面之下的油气目标层地震成像效果,提高了空间和时间分辨率.本文介绍了三维拖缆小容量的六源混合地震采集的技术方法和在巴伦支海高地的应用效果,分析了在具有类似地震地质条件的南黄海海相地震勘探中的应用前景,提出了地震资料采集方案建议.

The biggest difficulty of the marine seismic exploration in the Barents Sea and the South Yellow Sea is the strong reflection interface developed in the shallow part,with the smaller available seismic incident aperture,the insufficient seismic illumination density,and the degraded imaging quality of the target layer.The requirement of seismic exploration for the oil and gas in the Barents Sea is to effectively increase seismic illumination density with high acquisition efficiency and harmlessness to marine life.A new small capacity six source marine blended acquisition method(hexa-source)is adopted,realizes a denser and more uniform points distribution,doubles the seismic lighting density,and improves the seismic imaging effect of oil and gas target layers under the strong reflection interface with the higher spatial and temporal resolution.This paper introduces the three-dimensional small capacity six source seismic acquisition and its application effect in loppa highland of Barents Sea,analyzes the application prospect,and proposes suggestions of marine seismic exploration in the South Yellow Sea.