基于模型约束逆建模的储层物性参数估计方法  

Reservoir parameter estimation based on model-constrained inverse modeling

作　　者：刘倩 董宁[1] 季玉新[1] 陈天胜[1] LIU Qian;DONG Ning;JI Yuxin;CHEN Tiansheng(Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China)

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083

出　　处：《物探化探计算技术》2018年第4期539-546,共8页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家科技重大专项(2017ZX05005-004-002);中国博士后科学基金(2017M611111)

摘　　要：在油气储层的预测工作中,储层物性参数估计是重要的组成部分,从弹性参数中准确地估计出储层物性参数有助于油气藏品质的评价。以岩石物理理论为基础,基于地震岩石物理建模理论,提出了一种模型约束的岩石物理逆建模方法。针对目标储层的岩石物理特点,通过地震岩石物理模型建立起弹性参数与储层物性参数之间的定量关系。根据这种关系在三维物性参数域中计算出输入的弹性参数的等值面,利用不同弹性参数的等值面的空间交会进行物性参数的估计。由于输入数据可能包含误差或不确定性,为此在估计方法中加入模型约束,增强估计方法的稳定性,减少估计结果的误差。通过模型数据进行试算证明了方法的准确性和稳定性。将本方法应用于实际工区数据,取得了较好的估计效果,证明方法具有一定的实用性。Reservoir parameter estimation is indispensable in reservoir characterizations. Accurate estimation of reservoir parameter from elastic parameters is helpful for evaluation of reservoir quality. In the framework of rock physics theories, a model constrained inverse modeling method based on seismic rock physics modeling theory has been proposed in this paper. According to the rock physical characteristics of target reservoir, the relationship between elastic parameters and reservoir pa rameters can be built with rock physics models. Isosurfaees of input elastic parameters can be calculated in 3D reservoir param eter domain according to the relationship. Estimation of reservoir parameters is implemented by combining spatial intersections of isosurfaees. There are usually some errors or uncertainties in the elastic parameters. Constraints are added to enhance stabil ity and reduce the errors brought by the input elastic parameters. Model tests have shown that the accuracy and stability. A re al data test has proved the rationality and applicability.

关 键 词：储层物性参数 岩石物理 弹性参数 储层参数域 

分 类 号：P631.4[天文地球—地质矿产勘探]