固体地球物理研究生学术报告第二期报告一

The traditional methods to image the salt bodies do not consider near-salt stress perturbations caused by the salt, and the associated velocity perturbations of elastic seismic waves in the sediments near the salt. To demonstrate the importance of stress changes caused by the salt on accurately imaging salt bodies, we develop and apply a combined method of geomechanical stress modeling and salt imaging in this study. We find that when the effects of near-salt stress perturbations are not considered, the imaging of the salt sphere is clearly distorted, and the depth of the salt sphere boundary in the imaging results deviates from its true depth significantly. Furthermore, the imaging results without including near-salt stress perturbations are very poor in the resolution of the salt sphere. In contrast, when we consider the effects of near-salt stress perturbations, the imaging of this salt sphere accurately matches the true salt sphere both in shape and position. The results in this study show that the near-salt stress perturbations should not be ignored in salt imaging, and provide scientific insights for petroleum geologists and exploration geophysicists on the relation between the stress perturbations induced by the salt and accurate imaging of salt structures.