石油与天然气地质 ›› 2020, Vol. 41 ›› Issue (3): 627-637.doi: 10.11743/ogg20200318

• 方法技术 • 上一篇    下一篇

致密砂岩储层多尺度裂缝三维地质建模方法

董少群1,2, 吕文雅1,3, 夏东领4, 王世佳5, 杜相仪1,3, 王涛6, 伍岳4, 管聪1,3   

  1. 1. 油气资源与探测国家重点实验室, 北京 102249;
    2. 中国石油大学(北京)理学院, 北京 102249;
    3. 中国石油大学(北京)地球科学学院, 北京 102249;
    4. 中国石化 石油勘探开发研究院, 北京 100083;
    5. 中国石油 青海油田分公司采气二厂, 甘肃 敦煌 736202;
    6. 中国地质科学院, 北京 100037
  • 收稿日期:2019-07-20 修回日期:2020-03-05 发布日期:2020-06-16
  • 第一作者简介:董少群(1988-),男,博士、讲师,裂缝预测及建模、油藏描述、机器学习。E-mail:dshaoqun@163.com。
  • 基金项目:
    国家科技重大专项（2017ZX05009001-002，2017ZX05013002-004）；中央高校基本科研业务费专项资金项目（2462020YJRC005）；国家自然科学基金项目（41902142）。

An approach to 3D geological modeling of multi-scaled fractures in tight sandstone reservoirs

Dong Shaoqun1,2, Lyu Wenya1,3, Xia Dongling4, Wang Shijia5, Du Xiangyi1,3, Wang Tao6, Wu Yue4, Guan Cong1,3   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China;
    2. College of Science, China University of Petroleum(Beijing), Beijing 102249, China;
    3. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China;
    4. Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;
    5. No.2 Gas Production Plant, Qinghai Oil Field Branch Company Ltd., PetroChina, Dunhuang, Gansu 736202, China;
    6. Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2019-07-20 Revised:2020-03-05 Published:2020-06-16

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摘要： 致密砂岩储层裂缝系统由多尺度裂缝组成，不同尺度裂缝对油气开发的作用不同，多尺度裂缝建模对致密油气藏的开发至关重要。目前多尺度裂缝建模在不同尺度裂缝相关性耦合、终止条件求取和趋势约束算法效率等方面均存在难题。以鄂尔多斯盆地H油田为例，在常规裂缝网络建模的基础上，尝试探讨了致密砂岩储层多尺度裂缝的三维地质建模方法，以提高多尺度裂缝建模的效率和精度。所提多尺度裂缝建模方法主要包括确定性方法获得大尺度裂缝、分布函数匹配法实现多尺度耦合以确定中小尺度建模所需参数、改进密度约束的离散裂缝网络建模方法生成中小尺度裂缝网络、不同尺度裂缝网络叠加4个方面。为验证方法效果，将建立的研究区实际裂缝模型与单井裂缝解释结果、生产资料等进行了对比，结果表明该方法所建立的多尺度裂缝模型与实际地质认识相吻合。

关键词: 多尺度信息耦合, 离散裂缝网络建模, 多尺度裂缝, 致密砂岩储层, 鄂尔多斯盆地

Abstract: The fracture system in a tight sandstone reservoir is composed of multi-scaled fractures,Fractures of each scale play a different role in oil and gas recovery.Multi-scaled fracture modeling is crucial for the development of tight reservoirs.However,there are still problems in multi-scaled fracture modeling in terms of multi-scaled fractures' coupling,determination of simulation termination conditions,and efficiency improvement of constrained modeling algorithm.To solve these problems,we discuss the three-dimensional (3D) geological modeling of multi-scaled fractures in tight sandstone reservoirs in H oilfield,Ordos Basin,based on common fracture network modeling,with a view to improving the efficiency and accuracy of multi-scaled fracture modeling.The proposed multi-scaled fracture modeling method in the study includes 4 steps,namely identification of large-scaled fractures with a deterministic method,multi-scaled coupling through distribution function matching for determining the parameters required for small-scaled fracture modeling,generation of medium- and small-scaled fracture networks by an improved method of discrete fracture network modeling constrained by fracture density,and superimposition of multi-scaled fracture networks.To verify the efficiency of the proposed method,we compare the built fracture model with single-well fracture interpretation,production data,etc.in the study area,and the results indicate that the multi-scaled fracture model established by the proposed method coincides with actual geological understanding.

Key words: multi-scaled information coupling, discrete fracture network modeling, multi-scaled fracture, tight sandstone reservoir, Ordos Basin

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