多井约束条件的宽频速度建模方法

Broadband Velocity Modeling Method for Multiple-well Constraints

罗伟 朱焱辉 何敏 彭光荣 万琼华

LUOWei ZHUYanhui HEMin PENGGuangrong WANQionghua

中海石油(中国)有限公司深圳分公司, 广东 深圳 518064 中国科学院南海海洋研究所, 广东 广州 510301

Shenzhen Branch of CNOOC Ltd., Shenzhen, Guangdong 518064, China South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, Guangdong 510301, China

针对南海东部珠江口盆地目前勘探遇到的低幅构造难以落实的问题，应用基于多井约束条件下的宽频速度建模技术建立区域速度模型，落实靶点构造形态。讨论了该方法的思想、技术路线和应用步骤，并与PSDM方法得到的深度构造图进行了对比分析。实测数据处理结果表明：多井约束条件下的宽频速度建模技术受断层的影响存在一定的绝对误差，但同一层位的相对误差较小，研究工区速度体刻画更为准确，能更好地刻画低幅构造形态。探索出了一套针对南海东部珠江口盆地低幅构造的宽频速度建模分析方法。

So far, the exploration of the Pearl River Mouth Basin located in the eastern part of the South China Sea has encountered problems related to the determination of low relief structures. We used broadband velocity modeling under multiple-well constraints to create a velocity model for the region and to ascertain the objective structures. The concept, technical details, and application procedure of this method are discussed and compared with the depth-structure map obtained through the PSDM method. The data processing results show that the broadband velocity modeling technology under multiple-well constraints is affected by the existence of faults and the significant absolute error exists; however, the relative error for the same layer is smaller. A more accurately characterized velocity of the research area can produce better diagrams of low relief structures. A specific method of analysis for the broadband velocity modeling of low relief structures of the Pearl River Mouth Basin located in the eastern part of the South China Sea was explored.

10.11885/j.issn.16745086.2016.05.17.01