不确定性反演关键参数的地质含义及正演模型反演研究——以渤海海域W油田为例

发布时间：2018-07-27 10:42

【摘要】：地质统计学反演具有较高的空间分辨率,在储层预测中应用广泛,其反演精度受地质框架模型、纵/横向变程和岩性比例等多个因素的影响.传统方法主要从反演角度通过参数测试的方式开展参数对反演精度影响的研究,进而求取合适的反演参数.该参数求取方式效率低,反演结果精度不高,不能完全准确地反应储层空间变化特征.针对这一问题,本文采用从模型正演及其相应反演角度开展参数对反演精度影响的研究,并对反演参数求取方法进行了阐述.首先论述了地质框架模型及变差函数的地质含义,并以渤海W油田明化镇组下段储层特征为指导,构建了曲流河沉积典型的堆叠型和侧叠型地质模型,进而开展模型正演及相应的地质框架模型、纵向变程和横向变程对反演精度影响的研究.分析表明:1)基于高分辨率层序地层格架构建的地质框架模型有助于反演精度的提高;2)合适的变程能够提升反演分辨率.纵向变程的求取应综合考虑最小地质体大小、地震采样率等因素,而横向变程的求取应以地质信息为指导;3)开发阶段以砂层组级别地质框架模型为约束,结合储层特征求取反演参数的方法赋予了参数明确的地质含义,反演结果清晰表征了储层内部砂体叠置及空间展布特征,有助于提高薄储层表征精度,为开发后期的井位部署和井位调整提供依据.
[Abstract]:Geostatistical inversion has high spatial resolution and is widely used in reservoir prediction. Its inversion accuracy is influenced by many factors such as geological framework model, longitudinal / lateral variation range and lithologic ratio. The traditional method mainly studies the effect of parameters on inversion accuracy from the point of view of inversion, and then obtains the appropriate inversion parameters. The efficiency of calculating the parameters is low, and the inversion result is not accurate, which can not reflect the spatial variation of reservoir completely. In order to solve this problem, this paper studies the effect of parameters on inversion accuracy from the perspective of model forward modeling and its corresponding inversion, and expounds the method of obtaining inversion parameters. Firstly, the geological meaning of geological framework model and variation function are discussed. Based on the reservoir characteristics of the lower member of Minghuazhen formation in Bohai W oilfield, typical stacking and lateral stacking geological models of meandering river sediments are constructed. Then the forward modeling and the corresponding geological frame models, the effects of longitudinal and lateral variations on the inversion accuracy are studied. The analysis shows that the geological framework model based on high-resolution sequence stratigraphic framework is helpful to improve the inversion accuracy. The calculation of longitudinal variation range should take into account the minimum geological body size, seismic sampling rate and so on, while the calculation of transverse variation range should be guided by geological information. (3) in the development stage, the sand formation grade geological framework model should be taken as the constraint. The method of obtaining inversion parameters according to reservoir characteristics gives clear geological meaning to the parameters, and the inversion results clearly represent the characteristics of overlay and spatial distribution of sand bodies inside the reservoir, which is helpful to improve the accuracy of thin reservoir representation. It provides basis for well location deployment and well location adjustment in the later stage of development.
【作者单位】：中海油研究总院;中海石油(中国)有限公司天津分公司渤海石油研究院;
【基金】：国家科技重大专项“海上开发地震关键技术及应用研究”项目(2011ZX05024-001)资助
【分类号】：P618.13;P631.4

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