鄂尔多斯盆地陆相页岩油藏天然裂缝刻画与储层改造对策

doi:10.3969/j.issn.1672-7703.2024.03.012

摘要/Abstract

摘要： 鄂尔多斯盆地陇东地区三叠系延长组长７段页岩油储层主要为深湖相泥页岩和重力流砂体的交互沉积，储层的分布在纵向和横向上均复杂多变，单砂体厚度薄，同时又受到天然裂缝的影响，对该区科学压裂、生产提出了一系列挑战，压窜、砂堵等工程问题与降本增产成为目前重要攻关方向。文章总结了近两年来针对该区天然裂缝刻画方面的工作和认识，以及在压裂改造方面的最新理念和对策。在综合地质研究的基础上，建立三维精细地质、油藏和地质力学模型，进行合理的压裂设计、施工、压裂后分析和计算机模拟，更好地了解天然裂缝和水力裂缝之间的相互作用和水力缝的扩展规律，达到定制化的压裂设计和施工优化。最终实现施工井与同平台邻井在产量相当的情况下，支撑剂的用量减少20%左右、压裂液用量减少10%左右。这种地质工程一体化工作流程使“一井一策”和“一段一法”真正落到实处，从长远来看，这将成为鄂尔多斯盆地陆相页岩油达到单井和井场EUR最佳效果的基础性技术保障。

关键词: 页岩油, 地质工程一体化, 三叠系延长组, 长7段, 天然裂缝, 井间干扰

Abstract: The shale oil reservoir in the seventh member of the Triassic Yanchang Formation (Chang 7 member) in Longdong area in Ordos Basin is mainly composed of alternating deposits of deep lacustrine shale and gravity flow sand bodies, with complex and variable reservoir distribution both vertically and laterally, and thin single sand body. In addition, influenced by natural fractures, there are a number of challenges in scientific fracturing engineering and production operation in the area. Some engineering problems such as pressure channeling and sand plugging, as well as cost reduction and production increase, are important research topics at present. The work and understanding on the characterization of natural fractures in the area in the past two years are summarized, and the latest concepts and strategies in fracturing reconstruction are introduced. On the basis of comprehensive geological study, 3D fine geological, oil reservoir, and geomechanical models have been established, and rational fracturing design, construction, post fracturing analysis, and computer simulation have been conducted to better understand the interaction between natural fractures and hydraulic fractures and the propagation law of hydraulic fractures, achieving the customized fracturing design and construction optimization. After field application, the amounts of proppant and fracturing fluid have been reduced by about 20% and 10%, respectively, given the similar oil production between the construction well and adjacent wells on the same platform. The workflow with integration of geology and engineering enables the implementation of “one well, one strategy” and “one section, one method”. In the long run, it will be the fundamental technical guarantee for achieving the best EUR of single well and well platform for continental shale oil in Ordos Basin.

中图分类号:

TE319

雷启鸿, 马福建, 何右安, 王书宇, 牛利, 罗引, 叶坡, 黄天镜, 黄哲远, 刘原, 冯张斌. 鄂尔多斯盆地陆相页岩油藏天然裂缝刻画与储层改造对策[J]. 中国石油勘探, 2024, 29(3): 130-145.

Lei Qihong, Ma Fujian, He Youan, Wang Shuyu, Niu Li, Luo Yin, Ye Po, Huang Tianjing, Huang Zheyuan, Liu Yuan, Feng Zhangbin. Characterization of natural fractures and reservoir reconstruction strategy for continental shale oil reservoir in Ordos Basin[J]. China Petroleum Exploration, 2024, 29(3): 130-145.

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