基于改进BISQ机制的双相介质研究

【作者】 彭传正；

【导师】 李才明；

【作者基本信息】 成都理工大学 ， 固体地球物理学， 2007， 硕士

【摘要】 双相介质理论充分地考虑了介质的结构、流体与气体的特殊性质、局部特性与整体效应的关系，更能准确地描述实际地层结构和地层性质，自然也就更能适应越来越复杂的油气储藏勘探的实际需要。BISQ机制充分考虑了多孔隙介质中流体流动的最主要的两种流动形式：Biot流动和喷射流动。同时包含这两种流动力学机制的BISQ方程和改进BISQ更能真实、准确地反映地震波和声波的传播规律。虽然BISQ模型对双相介质的描述更为精细，然而BISQ模型计算公式复杂，并且方程中包含了喷射流长度等微观参量不便于实际描述，既考虑宏观又考虑微观，实践性较差。而改进的BISQ模型在包含喷射流机制的同时，并没有引入喷射流长度等分量，公式简单，计算方便，并且计算结果还与BISQ模型保持了一致。本文通过分别利用改进BISQ模型，BISQ模型和Biot模型三种模型进行波场模拟，通过模拟结果的相比较，印证了改进BISQ模型的有效性和可行性。本文基于非饱和多孔隙BISQ模型，应用非线性模拟退火算法对储层物性参数进行反演，利用一组含随机噪声的理论合成波速来模拟实际观测数据并依此来反演孔隙度、渗透率和含流体饱和度等储层参数。结果表明，基于非饱和BISQ模型的非线性模拟退火算法反演精度高，并且还具有较强的抗噪干扰性能，证明了本文储层参数反演方法在储层参数预测与反演中的有效性，为以后应用于油气储集层的静态描述、动态监测开发以及时移地震的理论研究和实际应用奠定了基础。更多还原

【Abstract】 The double-phase medium theory considered fully the medium structure, the fluid and the gas special nature, the partial characteristic and the overall effect relations, can describe the actual stratal configuration and the stratum nature accurately. It can meet the actual needs of more and more complex oil gas preserve exploration naturally.The BISQ mechanism has considered in fully the most main two mobile forms of Biot flowing and spraying flowing in multi-hole medium. Simultaneously containing these two flow mechanics mechanism, the BISQ equation and improved BISQ are able real to reflect the seismic wave and the sound wave dissemination rule accurately. Although the BISQ model is finer than the double-phase medium description, the BISQ model formula is complex and not to be advantageous for the actual description because the equation contained the reaction jet length etc. The improved BISQ model is not only simple, but also convenient for computation while containing the reaction jet mechanism other then reaction jet length components and so on. Father more, the computed result also maintained with the BISQ model consistently.By using separately the three kinds of model of reformed BISQ model, the BISQ model and the Biot model carried on the wave field simulation and compared with the analogue result, the validity and the feasibility of the improved BISQ model is verified.Based on the non-saturated multi-hole BISQ model and the application of non-linearity simulation annealing algorithm carried on the inversion to the reservoir natural parameter, the inversion of porosity, the penetration coefficient and degree of saturation was carried out by using a group of stochastic noise theory bound wave to simulate actual observation data. The result indicated that the inversion precision of non-linear simulation annealing algorithm is high based on the non-saturated BISQ model and has the strong anti-chirp disturbance performance. It also proves the inversion method in the reservoir parameter forecast and the inversion to be valid. It will be apply to the oil gas reservoir static description, the dynamic monitor development, the seismic fundamental research and the practical application.更多还原