Petrel速度建模技术在深度偏移中的应用

Application of Petrel Velocity Modeling Technology in Depth Migration

为了解决复杂地质构造的成像问题,叠前深度偏移技术是目前一项重要的技术手段。其成像效果的质量取决于深度域速度模型的精确度。主要研究了Petrel软件的多个模块,以地质地震一体化概念为指导思想,把研究中已有的丰富地质、测井以及物探信息,在深度域速度建模过程中得到充分的利用。整个建模包括了初始模型的建立和速度模型的完善。初始模型包括了近地表建模、井控垂向建模、层约束的井速度建模等;而模型最终的完善和修改应用的是层约束的网格层析反演技术。这样就建立了一套从浅入深、从点到面、从地质到地震比较成熟的速度建模流程。应用实例表明,应用该建模流程做出的速度模型,其应用效果良好。

In order to effectively solve the imaging problem of complex geological structures,prestack depth migration technology is an important technical means at present.The quality of imaging effect depends on the accuracy of velocity model in depth domain.This paper mainly studies several modules of Petrel software,taking the concept of integration of Geology and seismology as the guiding ideology,making full use of the abundant geological,logging and geophysical information in the deep domain velocity modeling process.The whole modeling includes the establishment of the initial model and the improvement of the speed model.Initial model includes near surface modeling,vertical well control modeling,well velocity modeling with layer constraints,etc.The ultimate improvement and modification of the model is the application of layer constrained grid tomography inversion technology.In this way,a set of relatively mature velocity modeling processes from shallow to deep,from point to surface,from geology to earthquake are established.The application example shows that the speed model made by this modeling process has good application effect.