层理性页岩柱塞样电阻率各向异性测量影响因素分析
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1.西南石油大学地球科学与技术学院;2.四川长宁天然气开发有限责任公司;3.中国石油集团测井有限公司西南分公司;4.中国石油集团西南油气田分公司页岩气研究院

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P319.2

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国家自然科学基金青年(42304139); 四川省自然科学(23NSFSC6107)


Analysis of factors affecting resistivity anisotropy measurements in bed-ded shale plug samples
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School of Geoscience and Technology, Southwest Petroleum University

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    摘要:

    电阻率对于各类油气资源储层的饱和度评价至关重要,但层理性页岩的电阻率具有很强的各向异性。开展了三位数值模拟分析了层理角度、样品长度及泥质和基质条带厚度和电导率差异对二极法测量层理性页岩柱塞样电阻率的影响。将不同层理角度下的样品与层理角度为0°时的电阻率比值定义为各向异性系数。模拟结果表明电阻率各向异性系数与层理角度的正弦值呈正相关。层理面与样品长轴斜交时,泥质和基质条带的厚度或电导率差异越大,电阻率各向异性系数也越大。样品长度会影响层理面与样品顶底端面的接触关系。当层理面贯穿样品顶底端面时,电流更多地集中于高导条带,从而弱化高阻条带对样品电阻率的贡献。提出了表征各向异性系数与测量角度关系的数学模型,该模型可以应用于页岩等层理性地层的电阻率各向异性校正中,服务非常规油气资源的定量评价。相关成果对于指导层理性岩石的电阻各向异性实验开展和电阻率测井资料校正具有重要的参考价值。

    Abstract:

    Resistivity plays a critical role in the saturation evaluation of various oil and gas reservoirs; however, the resistivity of bedded shale exhibits strong anisotropy. To investigate the influence of various factors on the anisotropic resistivity measurement of bedded shale plug samples using the dual-electrode method, numerical simulations were conduct-ed. The resistivity ratio between samples with different bedding angles and that with a 0° bedding angle was defined as the anisotropy coefficient. The simulation results indicated that the anisotropy coefficient was positively correlated with the cosine value of the bedding angle. When the bedding plane was inclined to the long axis of the sample, the anisotropy coefficient increased with larger differences in thickness or conductivity between clay and matrix laminae. Sample length affected the contact relationship between the bedding plane and the top and bottom faces of the sample. When the bedding plane passed through the top and bottom faces of the sample, more current was focused on the high-conductivity laminae, thereby weakening the contribution of high-resistivity laminae to the sample's resistivity. A mathematical model was proposed to describe the relationship between the anisotropy coefficient and the measurement angle, which could be applied to the anisotropy correction of resistivity measurements in bedded shale and other bedded formations, facilitating the quantitative evaluation of unconventional oil and gas resources. The re-search findings have significant reference values for directing resistivity anisotropy experiments on bedded formations and the correction of resistivity logging data.

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贾将,汪勇,黄毅,等. 层理性页岩柱塞样电阻率各向异性测量影响因素分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-10-10
  • 最后修改日期:2024-05-15
  • 录用日期:2024-05-21
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