The application of 3D velocity modeling based on geological constraint in Qiongdongnan basin deep water complex fault block area
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摘要: 南海琼东南盆地陵A油田由于中深层发育复杂断块以及纵横向地层速度变化剧烈,导致该地区资料信噪比低、难以建立精确的速度模型,以致地震成像结果不可靠.解决该问题的关键是通过精细速度建模以提高叠前深度偏移成像精度.为此,采用一种基于地质构造约束的高精度3D速度建模方法,在层析成像速度基础上引入断层和层位解释数据,对层析反演速度进行控制,设计了新的速度模型更新策略.所形成的地质构造导向速度建模流程提高了断块区域3D速度场精度,进而提高叠前深度偏移的剖面质量,为精细层位解释和断块构造的落实提供了优势的基础资料.Abstract: The Qiongdongnan basin LING A in the South China Sea is a complex fault block oil and gas field,which is characterized by complicated fault block in deep strata and great changes in vertical and horizontal velocity as well as low S/R.All of these factors lead to an unreliable imaging results.This situation seriously restrict the residual oil exploration.The key to solve this problem is to improve the accuracy of PSDM imaging with high precision velocity modeling.This paper presents a high precision 3D velocity modeling method based on geological constraint.On the basis of tomographic velocity modeling,the horizon and fault interpretation are used to constrain tomography inversion.This method designs a new strategy to update the velocity model,and improves the construction of initial model. The 3D velocity field is improved by new workflow,and the quality of profile of PSDM imaging is also enhanced.The results obtained by the authors confirm that the new velocity modeling method can provide the basic data for the interpretation of fine horizon and implemen-tation of fault block.
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