OBS与多道地震联合处理在油气勘探中的应用-以渤海OBS2011测线为例

OBS利用旅行时反演可以获得更准确的速度模型，但是仅依靠OBS数据进行速度建模面临很大问题；多道地震剖面可以较准确的解决地质构造形态问题，但在复杂构造地区难以获得准确的速度。本项目利用多道地震剖面指导OBS速度建模，利用OBS接收的广角折射、反射震相，通过旅行时层析成像的方法获得渤海OBS2011测线的速度-深度模型，并以此OBS速度模型为基础开展针对多道地震多次波去除和偏移成像的研究工作。本项目通过OBS与多道地震联合处理的方式，发挥各自的优势，弥补对方的缺点，可获得更准确的速度模型及更好的成像效果，从而为我国海洋油气勘探战略的实施提供一种新的技术方法储备。

The advantage of the inversion of OBS data is to get more accurate velocity model, but it is hard to construct the model only using OBS data. Multi-channel seismic profile can solve the problem of the geological structure, but it is hard to achieve accurate velocity especially in complex area. This project uses Multi-channel seismic profile to improve the accuracy of the OBS velocity, then reverses the velocity-depth model by tomography method with the wide-angle refraction and reflection seismic phases of the OBS2011 line of Bohai Sea. The OBS velocity model is also used for de-multiple and migration of the seismic data. The project is based on the joint processing of OBS and the multi-channel seismic data, it can exert in the advantages and supply a gap which will achieve better velocity model and image. The project can provide a new technology reserve for our ocean strategy of the oil and gas exploration.