Scholarlink

<p>Quantitative characterization of deep, complex carbonate reservoirs is a significant challenge due to strong heterogeneity and the ambiguity of conventional geophysical methods. To overcome these challenges, we employed a workflow based on a multi-parameter constrained 3D borehole-to-surface electromagnetic (BSEM) simultaneous inversion process. This approach utilizes seismic, well-log, and petrophysical data to constrain the inversion, resulting in 3D resistivity and polarizability volumes. Subsequently, an IP-inclusive oil saturation model (considering the induced polarization effect) was applied to these inverted parameters to derive a quantitative 3D oil saturation (So) volume. The method was applied to an Ordovician carbonate reservoir in Western China. Despite a weak IP response partially masked by a localized high-value anomaly, the constrained inversion resolved the 3D geoelectric structure and revealed a highly heterogeneous, discontinuous “pod-like” distribution of remaining oil. This study constitutes one of the first applications of the constrained method for quantitative saturation imaging in such a deep, complex setting. The results demonstrate good consistency and were validated by production data: the delineated primary oil-rich favorable zone (F1, defined by So &gt; 50%) shows good agreement with the high-saturation intervals encountered by Well X3. This validated workflow provides an effective tool for characterizing heterogeneous carbonate reservoirs where traditional methods prove inadequate. The identified remaining oil enrichment zones (e.g., F1, F3, F5) serve as actionable targets for optimizing future well placement and field development.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Predicting Remaining Oil Saturation in Complex Carbonate Reservoirs via Constrained BSEM Inversion and an IP-Inclusive Saturation Model

  • 期刊论文

  • 发表日期：

    2026年2月14日

查看全文
  • Yao Lu,
  • Zu-Zhi Hu,
  • Wei Wan,
  • Ya-Neng Luo,
  • Guo Zhao,
  • Ke Yang,
  • Shuai-Yin Ge,
  • Zhan-Xiang He,
  • Yun-Sheng Zhao

摘要

Quantitative characterization of deep, complex carbonate reservoirs is a significant challenge due to strong heterogeneity and the ambiguity of conventional geophysical methods. To overcome these challenges, we employed a workflow based on a multi-parameter constrained 3D borehole-to-surface electromagnetic (BSEM) simultaneous inversion process. This approach utilizes seismic, well-log, and petrophysical data to constrain the inversion, resulting in 3D resistivity and polarizability volumes. Subsequently, an IP-inclusive oil saturation model (considering the induced polarization effect) was applied to these inverted parameters to derive a quantitative 3D oil saturation (So) volume. The method was applied to an Ordovician carbonate reservoir in Western China. Despite a weak IP response partially masked by a localized high-value anomaly, the constrained inversion resolved the 3D geoelectric structure and revealed a highly heterogeneous, discontinuous “pod-like” distribution of remaining oil. This study constitutes one of the first applications of the constrained method for quantitative saturation imaging in such a deep, complex setting. The results demonstrate good consistency and were validated by production data: the delineated primary oil-rich favorable zone (F1, defined by So > 50%) shows good agreement with the high-saturation intervals encountered by Well X3. This validated workflow provides an effective tool for characterizing heterogeneous carbonate reservoirs where traditional methods prove inadequate. The identified remaining oil enrichment zones (e.g., F1, F3, F5) serve as actionable targets for optimizing future well placement and field development.