地学前缘 ›› 2025, Vol. 32 ›› Issue (5): 377-388.DOI: 10.13745/j.esf.sf.2025.8.55

• 智能储层透视 • 上一篇    下一篇

双重介质致密砂岩变岩电参数饱和度模型:以川西新场气田须二段为例

屈林博1,2(), 岳大力1,2,*(), 王武荣1,2, 金武军3, 赖合川1,2, 武清钊3, 廖昌珍3, 付家麟1,2, 张佳睿1,2, 李伟1,2   

  1. 1.中国石油大学(北京) 油气资源与工程全国重点实验室, 北京 102249
    2.中国石油大学(北京) 地球科学学院, 北京 102249
    3.中国石化石油勘探开发研究院, 北京 100083
  • 收稿日期:2025-08-05 修回日期:2025-08-14 出版日期:2025-09-25 发布日期:2025-10-14
  • 通信作者: 岳大力
  • 作者简介:屈林博(1999—),男,博士研究生,研究方向为智能油气藏表征与建模。E-mail: 2023315010@student.cup.edu.cn
  • 基金资助:
    国家自然科学基金项目(42272186);国家自然科学基金项目(42302128);国家自然科学基金项目(42472179);中国石油大学(北京)学科前沿交叉探索专项(2462024XKQY003)

Variable rock-electrical saturation model for dual-medium tight sandstones: A case from the second member of the Upper Triassic Xujiahe Formation, Western Sichuan Depression

QU Linbo1,2(), YUE Dali1,2,*(), WANG Wurong1,2, JIN Wujun3, LAI Hechuan1,2, WU Qingzhao3, LIAO Changzhen3, FU Jialin1,2, ZHANG Jiarui1,2, LI Wei1,2   

  1. 1. State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
    2. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
    3. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China
  • Received:2025-08-05 Revised:2025-08-14 Online:2025-09-25 Published:2025-10-14
  • Contact: YUE Dali

摘要:

川西坳陷上三叠统须二段致密砂岩气藏的勘探开发潜力巨大,但该地区埋藏较深、储层致密、构造复杂,且断裂-裂缝系统多期叠加,导致了裂缝与基质耦合作用下的多种储层类型。传统Archie含水饱和度解释模型在双重介质致密砂岩储层中适用性差、解释精度低,制约了气藏的高效开发。本文综合岩心观察、薄片分析、岩石物理实验及测井数据,将储层划分为裂缝型、裂缝-孔隙复合型和孔隙型3类。研究表明,不同储层类型的储集空间与渗流能力存在显著差异,导致了岩电参数的明显分异。本文通过优化岩电参数,构建了基于储层分类的变岩电参数饱和度解释模型。该模型计算结果与密闭岩心实测含水饱和度值及试气结果高度一致,平均绝对误差仅为4.35%,显著优于传统Archie模型的50.25%。本研究为双重介质致密砂岩储层流体饱和度解释提供了一种有效的新方法,为类似复杂孔隙结构的非常规气藏提供了可借鉴的技术路径与方法论支撑,有助于提高双重介质致密砂岩储量动用程度和高效开发。

关键词: 双重介质致密砂岩, 储层分类, 变岩电参数, 饱和度模型, 上三叠统须二段

Abstract:

The second member of the Upper Triassic Xujiahe Formation in the Western Sichuan Depression holds substantial potential for tight sandstone gas exploration and development. However, the deeply buried reservoirs exhibit complex structures, low porosity and permeability, and a multi-phase superimposed fracture system, resulting in diverse reservoir types formed through fracture-matrix coupling. Conventional Archie-based water saturation models perform poorly in dual-medium systems, causing low interpretation accuracy and hindering efficient development. This study integrates core observations, thin-section analyses, rock physics experiments, and well-logging data to classify reservoirs into three types: fractured, fracture-pore composite, and porous. Significant variations in pore structure and flow capacity among these types cause pronounced differences in petrophysical parameters. To address these differences, we developed a reservoir-classification-based saturation model with variable rock-electrical parameters. The model demonstrates strong agreement with measured water saturation from sealed core samples and gas testing results, yielding an average absolute error of 4.35%—a substantial improvement over the 50.25% error of the traditional Archie model. This research offers an effective approach for fluid saturation evaluation in dual-medium tight sandstone reservoirs and provides a transferable methodology for analogous unconventional gas systems. These findings ultimately contribute to enhanced hydrocarbon recovery and more efficient field development.

Key words: dual-medium tight sandstone, reservoir classification, variable rock-electrical parameters, saturation model, the second member of the Upper Triassic Xujiahe Formation

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