通过渗透率估算卤水饱和砂岩的附加电阻率

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Wenjun Zhao, Tangyan Liu, Jizhou Tang, J. Zhang
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引用次数: 0

摘要

由于岩石中孔隙的复杂性质,确定岩石电阻率以估计储层饱和度具有挑战性。本文旨在结合理论和实验数据,建立地层因素(F)与渗透率(K)的计算关系。首先推导了弯曲毛管模型渗透率与地层因素的关系,以及复杂弯曲毛管模型渗透率与地层因素的关系。理论分析证明了地层因素F与渗透率K、孔隙度φ成幂函数关系,并证实了附加电阻率R x的存在。为了验证理论研究,我们利用美国西部盆地致密砂岩35个不同孔隙度和渗透率的砂岩岩心的公开实验数据进行了模型分析,分别测量了20ppm、40ppm和80ppm盐水中的电阻率数据。通过拟合饱和地层水岩石电阻率(R o)与地层水电阻率(R w)之间的关系,证实了附加电阻率(R x)的存在。然后,我们将地层电阻率变化因子(F d)与渗透率(K)、地层电阻率变化因子(F d)与孔隙度(φ)、附加电阻率(R x)与渗透率(K)、附加电阻率(R x)与孔隙度(φ)进行拟合。在对数坐标下,可变地层电阻率变化因子(F d)和附加电阻率(R x)均与渗透率(K)呈较强的线性关系。我们还利用现有的实验数据,通过改变地层参数和渗透率,验证了合适方程的存在性。研究表明,拟合方程可用于确定变渗透率饱和地层水的可变地层电阻率变化因子F d、附加电阻率R x和岩石电阻率R o。预测的饱和地层水岩石电阻率(R o)与实验室测量值具有较强的相关性,为今后饱和度评价中的储层评价提供了更好的精度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Estimating Additional Resistivity by Permeability in Brine Saturated Sandstones
Determining rock resistivity for saturation estimation in reservoirs is challenging due to the complex nature of pores in the rock. This paper aims to establish a computational relationship between formation factors ( F ) and permeability ( K ) by combining theoretical and experimental data. Firstly, the relationship between the permeability of the curved capillary model and formation factors, as well as the relationship between the permeability of the complex curved capillary model and formation factors, are deduced. Theoretical analysis proved that the formation factors( F ) have a power relationship with permeability( K ) and porosity ( φ ), and confirms the existence of additional resistivity ( R x ). To validate the the theoretical study, we conducted model analysis using open experimental data from thirty-five sandstone cores with different porosity and permeability from the tight gas sandstone in the Western U.S. Basins, which measured resistivity data in saline at 20ppm, 40ppm, and 80ppm, respectively. We confirmed the existences of additional resistivity ( R x ) by fitting the relationship between the rock resistivity of saturated formation water ( R o ) and the formation water resistivity ( R w ). We then fitted the formation resistivity change factor ( F d ) with permeability ( K ), the formation resistivity change factor ( F d ) with porosity ( φ ), the additional resistivity ( R x ) with permeability ( K ), and the additional resistivity ( R x ) with porosity ( φ ). Both changeable formation resistivity change factor ( F d ) and additional resistivity ( R x ) showed a strong linear relationship with permeability ( K ) in logarithmic coordinates. We also verified the existence of a suitable equation using available experimental data by changing formation parameters and permeability. The study shows that the fitting equations may be utilized to determine changeable formation resistivity change factor ( F d ), additional resistivity ( R x ), and the rock resistivity of saturated formation water ( R o ) with varying permeability. The predicted rock resistivity of saturated formation water ( R o ) strongly correlates with the one measured in the laboratory, providing better precision for future reservoir evaluation in saturation estimations.
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来源期刊
Petroleum Geoscience
Petroleum Geoscience 地学-地球科学综合
CiteScore
4.80
自引率
11.80%
发文量
28
审稿时长
>12 weeks
期刊介绍: Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.
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