Heterogeneity is one of the core content of reservoir characterizations for hydrocarbon exploration and development. However, most heterogeneity studies are conducted based on statistical calculations using permeability and porosity data. Although there have been attempts to evaluate heterogeneity by quantifying the complexity of the logging data, these evaluations rarely consider the spatiotemporal multiscale of strata systems, which may lead to an inadequate understanding of multicycle sedimentation and incorrect analysis results. To fill this research gap, in this study, a novel heterogeneity analysis method was developed based on multiscale entropy analysis (MSEA). Using the natural gamma (GR) logging data of the strata, the method can be used to accurately depict the heterogeneity of the formation. Furthermore, based on the geological background and multiple spatiotemporal scales, the relationship between the obtained MSEA values and oil production is presented. To demonstrate the effectiveness of the proposed method, the Chang-8 member in the Yanchang Oilfield was selected as a case study. The results show that a positive correlation exists between the MSEA values of the GR logging data and the heterogeneity. Additionally, there is a significant negative correlation between the MSEA values of the GR logging data and production. For single-wells, the correlation coefficients between the MSEA values and oil production range from −0.64 to −0.95, with an average of −0.76.

非均质性是油气勘探开发储层表征的核心内容之一。但是，大多数非均质性研究是基于使用渗透率和孔隙度数据的统计计算进行的。尽管已经尝试通过量化测井数据的复杂性来评估非均质性，但这些评估很少考虑地层系统的时空多尺度，这可能导致对多周期沉积的认识不足以及分析结果不正确。为了填补这一研究空白，本研究基于多尺度熵分析（MSEA），开发了一种新颖的异质性分析方法。使用地层的自然伽马（GR）测井数据，该方法可用于准确描述地层的非均质性。此外，基于地质背景和多种时空尺度，提出了获得的MSEA值与产油量的关系。为了证明所提方法的有效性，选择了延长油田的长8井组作为案例研究。结果表明，GR测井数据的MSEA值与异质性之间存在正相关关系。此外，GR测井数据的MSEA值与产量之间存在显着的负相关性。对于单井，MSEA值与采油量之间的相关系数在-0.64至-0.95之间，平均值为-0.76。选择了延长油田的长8成员作为案例研究。结果表明，GR测井数据的MSEA值与异质性之间存在正相关关系。此外，GR测井数据的MSEA值与产量之间存在显着的负相关性。对于单井，MSEA值与采油量之间的相关系数在-0.64至-0.95之间，平均值为-0.76。选择了延长油田的长8成员作为案例研究。结果表明，GR测井数据的MSEA值与异质性之间存在正相关关系。此外，GR测井数据的MSEA值与产量之间存在显着的负相关性。对于单井，MSEA值与采油量之间的相关系数在-0.64至-0.95之间，平均值为-0.76。