中国石油勘探 ›› 2019, Vol. 24 ›› Issue (6): 815-821.DOI: 10.3969/j.issn.1672-7703.2019.06.014

• 工程技术 • 上一篇    下一篇

四维影像裂缝监测技术在致密气砂体展布研究中的应用

刘子雄,陈玲   

  1. 中海油田服务股份有限公司油田生产研究院
  • 出版日期:2019-11-15 发布日期:2019-11-15
  • 基金资助:
    中海油田服务股份有限公司科研项目“山西致密气压裂增产效果综合评价研究及应用”(YSB16YF004)。

Application of 4D microseismic fracture monitoring on tight gas sandstone distribution

Liu Zixiong, Chen Ling   

  1. Oilfield Production Research Institute, China Oilfield Services Limited
  • Online:2019-11-15 Published:2019-11-15
  • Supported by:
     

摘要: 致密砂岩气储层砂体变化快,目前主要通过静态的地震、岩心、测井等资料开展砂体展布研究,而勘探 开发初期资料较少,砂体预测精度低,应用这些成果指导压裂设计风险较大。对鄂尔多斯盆地东部某区块30 多口致 密气井的四维影像裂缝监测成果进行分析,修正了主要压裂层的砂体展布方向和边界,根据不同的砂体位置预测砂堵 风险,制定了20~30m3 不同的加砂规模。研究结果表明,砂体展布规模在很大程度上影响压裂裂缝的破裂和延伸, 通过四维影像微地震监测的不同时刻的压裂裂缝破裂情况判断砂体展布,约束沉积相研究中的砂体认识,并根据砂体 展布情况优化压裂施工参数,可以准确判断砂堵风险,指导致密气压裂设计和开发。

 

关键词: 致密气, 砂体展布, 裂缝监测, 砂堵, 沉积相

Abstract: Sandstone in tight gas reservoirs changes rapidly. At present, static seismic, cores, logging and other data are used to investigate sandstone distribution. However, due to insufficient seismic data in initial exploration and development, the prediction accuracy of sandstone distribution is low, and it is risky to guide later fracturing design using the results. According to the 4D microseismic fracture monitoring results recorded in more than 30 tight gas wells in a block in the eastern Ordos Basin, the direction and boundary of sandstone distribution in target layers to be fractured were corrected, the risk of sand plugging was predicted according to the sandstone position, and 20-30m3 sand addition schemes were proposed. The study results show that the scale of sandstone distribution greatly affects the fracturing and extension of induced fractures; first, sandstone distribution can be judged by the fracturing monitored by 4D microseismic survey; then, the understanding of sandstone distribution can be constrained from sedimentary facies study; and finally, fracturing parameters can be optimized for accurately locating sand plugging and supporting fracturing design and development of tight gas reservoirs.

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