多参数约束反演系统的原理和方法

THEORY AND METHOD OF MULTIPARAMETER-CONSTRAINED INVERSION

文章论述了包括测井反演、宽带约束反演和岩性约束反演在内的多参数约束反演的理论。其中测井反演不仅提供用于地质解释的参数，还把它作为宽带约束反演的初始模型及约束条件；宽带约束反演利用阻尼广义道方法和最优化计算方法，提供宽频带的高分辨反射系数剖面，最终获得宽带波阻抗模型。利用以上资料，进行岩性约束反演，可得到与井对比的孔隙度等岩性参数剖面，最终获得过井储集层地质剖面。

Reservoir characterization can be greatly enhanced by integrating seismic, borehole data and geological information. The theory, method and technique of mutliparameter-constrained inversion is presented in this paper. These are three major parts: well-log inversion (volunetric analysis ), broadband-constrained inversion, and lithology-constrained inversion. The well-log inversion results can not only provide parameters for geological interpretation, but also be used as the initial-model and constrained condition of broadband-constrained inversion. In the broadband-constained inversion, damping-generalized inversion method and optimization method are used to get broadband high-resolution reflection coefficient profile, and broadband acoustic impedance method. The above information is subsequently used to perform lithology-constrained inversion to obtain final lithology-parameter profile, such as porosity profile, to be compared with well-log curve, layer effective pressure profile, etc.