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地震叠前弹性参数反演可以为解释人员提供丰富的岩性和流体的信息。针对上述典型的非线性反演问题,模拟退火法在解空间进行全局寻优,克服了线性算法容易陷入局部极值的缺陷,但其计算速率较低。为此,本文首先详细地介绍了一种快速模拟退火算法,并将其应用到叠前三参数同步反演,主要是采用似Cauchy分布产生初始模型,广义Gibbs分布作为接受准则,并对由叠前数据求得的目标函数快速搜索全局最优解。通过模型试验表明,基于本文的快速模拟退火算法反演得到的三参数不仅精度高,而且计算效率得到了一定的提高。
The seismic prestack elastic parameter inversion can provide the interpreter with abundant lithology and fluid information. In view of the above typical nonlinear inversion problem, the simulated annealing method performs global optimization in the solution space and overcomes the defect that the linear algorithm is apt to fall into the local extreme, but its calculation speed is low. To this end, this paper first introduces in detail a fast simulated annealing algorithm and applies it to the pre-stack three-parameter synchronous inversion, mainly using the Cauchy distribution to generate the initial model, the generalized Gibbs distribution as the acceptance criterion, The objective function obtained from the previous data searches for the global optimal solution quickly. The model tests show that the three parameters obtained by the fast simulated annealing algorithm based on this paper not only have high accuracy but also improve the computational efficiency.