混合速度建模技术在东海西湖凹陷复杂断块解释中的应用  

Application of hybird velocity modeling technique in the interpretation of complex fault blocks in Xihu Depression in the East China Sea

作　　者：周静毅 潘新朋 李振伟 ZHOU Jingyi;PAN Xinpeng;LI Zhenwei(Exploration and Development Research Institute of SINOPEC Shanghai Offshore Oil&Gas Company,Shanghai 200120,China;Central South University Geophysical Institute,Changsha 410083,China)

机构地区：[1]中国石化上海海洋油气分公司勘探开发研究院,上海200120 [2]中南大学地球物理学院,湖南长沙410083

出　　处：《复杂油气藏》2023年第3期289-292,307,共5页Complex Hydrocarbon Reservoirs

摘　　要：地震勘探中建立合理的速度场是一项至关重要的工作。在地震资料解释中时深转换的准确与否取决于速度。多项式拟合得到的时深关系在单口井较为准确,对于复杂地区显得不合理。为了得到更为合理的构造图,采取了混合速度模型技术。混合速度建模技术首先加入地震处理速度体作为参考,其次利用精细解释的断层和层位建立构造框架模型作为横向约束,钻井的时深关系和地质分层数据作为纵向约束生成混合速度模型。用混合速度模型得到的深度更接近实际钻井数据,误差更小,降低了勘探风险。It is very important to establish a reasonable velocity field in seismic exploration.The accuracy of time-depth conversion in seismic data interpretation depends on the speed.The time-depth relationship obtained by polynomial fitting is more accurate in a single well,but it is unreasonable for complex areas.To obtain a more reasonable tectonic map,the hybrid velocity model technique is adopted.The hybrid velocity modeling technology first adds the velocity volume of seismic processing as a reference,then builds a structural framework model using the well-interpreted faults and layers as a horizontal constraint,and finally generates a hybrid velocity model by using the time-depth relationship of the drilled wells and the geological stratification data as a longitudinal constraint.The depths obtained with the hybrid velocity model are closer to the actual drilling data,and the error is smaller,reducing the exploration risk.

关 键 词：地震解释 复杂断块 混合速度建模 勘探风险 西湖凹陷 

分 类 号：P631[天文地球—地质矿产勘探]