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<p>To address the limitations of traditional sequence stratigraphy in identifying high-resolution sequence boundaries, the Integrated Predictive Error Filter Analysis (INPEFA) technique was applied. This method, combined with wireline logs—including Gamma Ray (GR), GR-MESA, and Predictive Error Filter Analysis (PEFA)—quantitatively analyzes sedimentary cycles and extracts hidden periodic features within wireline log curves. The results demonstrate that the INPEFA curve effectively reflects depositional cyclicity through its trend variations: positive trends indicate transgressive/flooding stages with increasing shale content while negative trends indicate regressive stages with increasing sand content. Inflection points also play a key role in determining sequence boundaries of different orders. The positive inflection points correspond to sequence boundaries. In contrast, negative inflection points correspond to flooding surfaces. Analysis of multiple wells (e.g., Well C142, Well C185, Well C260) identified multi-order base-level cycles, including 2–4 medium-term cycles, 5–7 short-term cycles, and 9–14 super-short-term cycles, establishing high-resolution sequence stratigraphic framework for the Chang 3 Member. Lithologic analysis reveals that the sub-members Chang 3-1, Chang 3–2, and Chang 3–3 are dominated by interbedded sandstones and shales. Variations in sand content and the presence of special lithologies (e.g., oil-stained sandstone and calcareous sandstone) reflect changes in hydrodynamic conditions and sediment supply. This study confirms that the INPEFA method enhances the accuracy of sequence division and correlation, providing a reliable geological model for understanding depositional system evolution. The controls of tectonic evolution, sedimentary environment, sediment supply and lacustrine fluctuation exert mutual effects on sequence architecture. It offers significant guidance for hydrocarbon exploration within the Yanchang Formation.</p>

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The establishment of high-resolution sequence stratigraphy linked to INPEFA analysis in third member of Yanchang Formation, central Ordos Basin

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Jiu-kuo Wang,
  • Shi-qiang Xia,
  • Qian-qian Fan,
  • Xiao-liang Liu

摘要

To address the limitations of traditional sequence stratigraphy in identifying high-resolution sequence boundaries, the Integrated Predictive Error Filter Analysis (INPEFA) technique was applied. This method, combined with wireline logs—including Gamma Ray (GR), GR-MESA, and Predictive Error Filter Analysis (PEFA)—quantitatively analyzes sedimentary cycles and extracts hidden periodic features within wireline log curves. The results demonstrate that the INPEFA curve effectively reflects depositional cyclicity through its trend variations: positive trends indicate transgressive/flooding stages with increasing shale content while negative trends indicate regressive stages with increasing sand content. Inflection points also play a key role in determining sequence boundaries of different orders. The positive inflection points correspond to sequence boundaries. In contrast, negative inflection points correspond to flooding surfaces. Analysis of multiple wells (e.g., Well C142, Well C185, Well C260) identified multi-order base-level cycles, including 2–4 medium-term cycles, 5–7 short-term cycles, and 9–14 super-short-term cycles, establishing high-resolution sequence stratigraphic framework for the Chang 3 Member. Lithologic analysis reveals that the sub-members Chang 3-1, Chang 3–2, and Chang 3–3 are dominated by interbedded sandstones and shales. Variations in sand content and the presence of special lithologies (e.g., oil-stained sandstone and calcareous sandstone) reflect changes in hydrodynamic conditions and sediment supply. This study confirms that the INPEFA method enhances the accuracy of sequence division and correlation, providing a reliable geological model for understanding depositional system evolution. The controls of tectonic evolution, sedimentary environment, sediment supply and lacustrine fluctuation exert mutual effects on sequence architecture. It offers significant guidance for hydrocarbon exploration within the Yanchang Formation.