带先验约束的碎屑岩储层物性参数反演方法  

Inversion method for petrophysical parameters with prior constraints

作　　者：白俊雨[1] BAI Jun-yu(Sinopec Geophysical Research Institute,Nanjing 211103,China)

机构地区：[1]中国石油化工股份有限公司石油物探技术研究院,南京211103

出　　处：《地球物理学进展》2020年第2期530-535,共6页Progress in Geophysics

基　　金：国家科技重大专项项目(2017ZX05036005-001)资助.

摘　　要：对弹性参数进行转换而获取物性参数的方法,适用范围有限且预测精度不高.本文基于岩石物理理论,提出一种带先验约束的碎屑岩储层物性参数预测方法,为储层预测、流体识别、储层描述、储量估计、烃类开发方案设计提供重要参数.应用岩石物理理论和物性参数先验信息建立了带先验约束的目标函数;并利用最优化方法对反演目标函数进行优化求解,对储层的物性及孔隙度和泥质含量进行同步迭代反演.经过正演数据及实际地震资料的测试应用,其结果表明本文方法反演得到的孔隙度和泥质含量为储层综合预测提供了愈加丰富的评价指标,同时孔隙度和泥质含量数据的联合应用对减小储层预测的多解性和降低勘探开发的风险有重要意义.Conventional prediction methods of reservoir petrophysical parameters are mostly obtained through the conversion of elastic parameters, which have limited application and low prediction accuracy. Based on the theory of petrophysics and seismic inversion, this paper presents an inversion method for petrophysical parameters with prior constraints, which provides important parameters for reservoir prediction, fluid identification, reservoir description, reserves estimation and hydrocarbon development scheme design. First, the functional relationship between elastic parameters and reservoir physical parameters is established by the petrophysical theory, and then the inversion objective function is established jointly with pre-stack inversion P-wave impedance and S-wave impedance. Then, the gradient information of the objective function is calculated by the difference method, and the inversion objective function is optimized by the optimization method, so that the simultaneous inversion of porosity and shale content can be realized. The results of model testing and field data application show that the proposed method can further invert reservoir petrophysical parameters based on conventional pre-stack inversion data, and provide more abundant basic data for reservoir comprehensive evaluation. At the same time, the combined application of porosity and shale content data has a great significance to reduce the multi-solution of reservoir prediction and the risk of exploration and development.

关 键 词：岩石物理理论 地震反演 先验约束 储层物性参数 孔隙度 泥质含量 

分 类 号：P631[天文地球—地质矿产勘探]